{"title":"Antlia Filters","description":"\u003cp\u003eAntlia Filters is a renowned company for astronomical filters. They make high quality filters and specializes in providing a series of premium 3nm\/4.5nm\/7nm H-alpha, SII, and OIII narrowband imaging filters, LRGB-V filters, dual-band filters, OAG, H-beta-OIII visual filter, filter drawers, adapters, holders, and related astronomy accessories for deep-sky photography enthusiasts all around the world.\u003cbr\u003e\u003c\/p\u003e","products":[{"product_id":"antlia-alp-t-dual-band-5nm-highspeed-filter-2-00-mounted","title":"Antlia ALP-T Dual Band Ha+OIII 5nm Highspeed Filter","description":"\u003ch2\u003eAntlia ALP-T Dual Band Ha+OIII 5nm Highspeed Filter\u003c\/h2\u003e\n\u003cp\u003eALP-T Dual Band 5nm Highspeed Filters are further optimized to work with high-speed imaging systems by shifting slightly the passband and center wavelength. Using these highspeed filters between optics f\/2.2 and f\/3.6 shows much stronger and more contrasted in nebulae imaging compared to the standard version.\u003c\/p\u003e\n\u003cp\u003eFor optics f-ratios slower than f\/3.6, the standard ALP-T Dual Band 5nm filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f\/2.2, the highspeed version is the best choice.\u003c\/p\u003e\n\u003cp\u003eBut keep in mind, the blue shift data by the computer simulation indicates narrowband filter shifts its bandwidth to shorter wavelengths with faster optics than f\/2, transmission at the emission wavelength may decrease perhaps 15%-20%. Although the Antlia ALP-T highspeed filter has similar transmission rates reduction in the H-a and OIII when the filter is used on fast optics, based on current standard version users’ data, it is evident that the filter still has the high performance of increase in emission nebula contrast and minimized halo.\u003c\/p\u003e\n\u003cp\u003eThe highspeed version price is the same as the standard filters and double benefits for the high-speed optics users. Worth mentioning is that Antlia inspected and measured products piece by piece with one of Agilent Cary’s professional spectrophotometer, resolution\/slit width is up to 0.2nm, which make us provide highly reliable and consistent products to you.\u003c\/p\u003e\n\u003cp\u003eThe Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR’s and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\u003cp\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDesigned especially for fast astronomy optics, in particular f-ratios f\/2.2 to f\/3.6\u003c\/p\u003e\n\u003cp\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/p\u003e\n\u003cp\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/p\u003e\n\u003cp\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/p\u003e\n\u003cp\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/p\u003e\n\u003cp\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/p\u003e\n\u003cp\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/p\u003e\n\u003cp\u003eNear IR (NIR) is blocked up to 1050nm\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSolar imaging\u003c\/p\u003e\n\u003cp\u003eNight visual observation\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" width=\"585px\" align=\"LEFT\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e657.8nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e502.2nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e88%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e82%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eBlocking\u003c\/td\u003e\n\u003ctd colspan=\"2\" rowspan=\"1\" valign=\"top\" data-mce-fragment=\"1\"\u003e≥OD4.5 @ 300-1050nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd colspan=\"2\" valign=\"top\" data-mce-fragment=\"1\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSpectrum Curve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"ALP-T Duanl Band 5nm Highspeed Filtes Spectrum Curve.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgjqickgYov6i9hwIwwgk4lgw.jpg\" width=\"650\" height=\"832\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eALP-T Highspeed Filter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cp\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"2\" Mounted","offer_id":43780787044581,"sku":"AF-ALP-T-HS-2","price":539.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":43780787077349,"sku":"AF-ALP-T-HS-36","price":423.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-dual-band-5nm-highspeed-filter-astronomy-plus-1.webp?v=1690488398"},{"product_id":"antlia-alp-t-dual-band-5nm-filter","title":"Antlia ALP-T Dual Band 5nm Ha \u0026 OIII \"Gold\" Filter","description":"\u003ch2 data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm Ha\u0026amp;OIII Filter\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003e***** Antlia FAMOUS filter known as Gold Filter! *****\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR’s or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSolar imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNight visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAdditional independent tests and reviews are available here, please credit the photographer’s names if you use their images on your website.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"381\" width=\"579\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgvJCijQYo_JyH3AQw3As43Qc.jpg\" alt=\"IC434_ALP_T+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgvJCijQYo_JyH3AQw3As43Qc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: IC434 – Horse Head and Flame Nebulae\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera : IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 24\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"352\" width=\"527\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg1JKijQYogYbvvQIw3As46gc.jpg\" alt=\"NGC2244_LIGHT_3+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg1JKijQYogYbvvQIw3As46gc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: NGC2244 – Rosette Nebula\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera: IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 30\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"348\" width=\"522\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg85eijQYopMPmxwYw3As46gc.jpg\" alt=\"NGC 6960_Western Veil nebula+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg85eijQYopMPmxwYw3As46gc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: Western Veil nebula\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera: IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 7\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"327\" width=\"513\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg-5qijQYo-b6ohwIw3As4vQc.jpg\" alt=\"IC63_LIGHT+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg-5qijQYo-b6ohwIw3As4vQc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: IC63 – The Phantom of Cassiopeia\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera : IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2″\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 32\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"354\" width=\"529\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgwp6ijQYo1KLR4QEw3As46gc.jpg\" alt=\"betelgeuse+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgwp6ijQYo1KLR4QEw3As46gc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: Betelgeuse(Magnitude：0.5)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera: IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea) \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable align=\"LEFT\" border=\"1\" width=\"585px\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003e656.3nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003e500.7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003e90%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003e82%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eBlocking\u003c\/td\u003e\n\u003ctd valign=\"top\" rowspan=\"1\" colspan=\"2\"\u003e≥OD4.5 @ 300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd valign=\"top\" colspan=\"2\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum Curve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg height=\"368\" width=\"580\" data-ll-status=\"loaded\" alt=\"Antlia ALP-T Dualband 5nm spectrum curve.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg34KijQYowJrAHzDFCTiGBg.jpg\" class=\"need_fix lazyloaded\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg34KijQYowJrAHzDFCTiGBg.jpg\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eALP-T Filter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia \u003cspan data-mce-fragment=\"1\"\u003e3-Years Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"2\" Mounted","offer_id":43780770103525,"sku":"AF-ALP-T-2-HaOIII","price":539.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":43780770136293,"sku":"AF-ALP-T-36-HaOIII","price":423.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-dual-band-5nm-haandoiii-gold-filter-astronomy-plus-1.webp?v=1690488412"},{"product_id":"antlia-sho-3nm-narrowband-pro-filters-sho-pro","title":"Antlia SHO 3nm Narrowband PRO Filters","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia SHO 3nm Narrowband Pro Filters\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia SHO Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SHO 3nm Pro filters are designed to deliver 88% transmission which provides you with the maximum signal and well defined nebulae structures.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR (signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHigh transmittance and smallest bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNarrowband Objects: H-alpha Emission Nebulae, H-alpha Emission Nebulae, SII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eExtends imaging time when the moon is up\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia narrowband Pro filters can be used down to F\/3 systems with slight loss of signal\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThis filter is not suited to deep sky objects that do not contain H-alpha emissions.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia SII 3nm Pro filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the SII signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/p\u003e\n\u003cp\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch4\u003e\u003cem\u003eSII Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness：\u003c\/strong\u003e2mm+\/-0.05mm\/ (3mm+\/-0.05mm for Dia50mm unmounted)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength)\u003c\/strong\u003e: 671.6nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e＞88%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cem\u003eH-Alpha Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness:   \u003c\/strong\u003e2mm+\/-0.05mm \/ (3mm+\/-0.05mm for Dia50mm unmounted)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength)\u003c\/strong\u003e: 656.3nmnm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e＞88%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cem\u003eOIII Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoptical substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness:   \u003c\/strong\u003e2mm+\/-0.05mm \/ (3mm+\/-0.05mm for Dia50mm unmounted)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength)\u003c\/strong\u003e: 500.7nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e＞85%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSelected Filters\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"1.25\" Round Mounted \/ SHO Filter Set","offer_id":43780850188517,"sku":"AF-SHO-PRO-1.25","price":1086.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ H-Alpha","offer_id":43780852515045,"sku":"AF-HA-PRO-1.25","price":362.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Oxygen III","offer_id":43780852547813,"sku":"AF-OIII-PRO-1.25","price":362.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Sulfur II","offer_id":43780852580581,"sku":"AF-SII-PRO-1.25","price":362.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ SHO Filter Set","offer_id":43780850221285,"sku":"AF-SHO-PRO-31","price":1170.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ H-Alpha","offer_id":43780852613349,"sku":"AF-HA-PRO-31","price":390.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ Oxygen III","offer_id":43780852646117,"sku":"AF-OIII-PRO-31","price":390.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ Sulfur II","offer_id":43780852678885,"sku":"AF-SII-PRO-31","price":390.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ SHO Filter Set","offer_id":43780850254053,"sku":"AF-SHO-PRO-36","price":1320.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ H-Alpha","offer_id":43780852711653,"sku":"AF-HA-PRO-36","price":440.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ Oxygen III","offer_id":43780852744421,"sku":"AF-OIII-PRO-36","price":440.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ Sulfur II","offer_id":43780852777189,"sku":"AF-SII-PRO-36","price":440.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ SHO Filter Set","offer_id":43780850286821,"sku":"AF-SHO-PRO-2","price":1683.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ H-Alpha","offer_id":43780852809957,"sku":"AF-HA-PRO-2","price":561.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Oxygen III","offer_id":43780852842725,"sku":"AF-OIII-PRO-2","price":561.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Sulfur II","offer_id":43780852875493,"sku":"AF-SII-PRO-2","price":561.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ SHO Filter Set","offer_id":43780850319589,"sku":"AF-SHO-PRO-50R","price":2088.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ H-Alpha","offer_id":43780852908261,"sku":"AF-HA-PRO-50R","price":696.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ Oxygen III","offer_id":43780852941029,"sku":"AF-OIII-PRO-50R","price":696.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ Sulfur II","offer_id":43780852973797,"sku":"AF-SII-PRO-50R","price":696.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ SHO Filter Set","offer_id":43780850352357,"sku":"AF-SHO-PRO-50S","price":3195.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ H-Alpha","offer_id":43780853006565,"sku":"AF-HA-PRO-50S","price":1065.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ Oxygen III","offer_id":43780853039333,"sku":"AF-OIII-PRO-50S","price":1065.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ Sulfur II","offer_id":43780853072101,"sku":"AF-SII-PRO-50S","price":1065.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-sho-3nm-narrowband-pro-filters-astronomy-plus-1_9e92846b-a4db-4fb9-8abb-50827bd23729.jpg?v=1690488413"},{"product_id":"antlia-sho-4-5nm-narrowband-edge-filters-sho-edge","title":"Antlia SHO 4.5nm Narrowband EDGE Filters (SHO-EDGE)","description":"\u003ch2 data-mce-fragment=\"1\"\u003eAntlia SHO 4.5nm Narrowband EDGE Filters\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia SHO EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR (signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 4.5nm EGDE filters are designed to deliver high transmittance that provides you with the maximum signal to reveal the faintest of nebulae structures.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the SHO 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNarrowband Objects: Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eExtends imaging time when the moon is up\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThis filter is only effective for deep sky objects that contain H-alpha, SII, OIII emissions\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem data-mce-fragment=\"1\"\u003eSII Specifications:\u003c\/em\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eOptical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Thickness:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e2mm+\/-0.05mm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFWHM (Full width at half maximum):\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e4.5nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eCWL (Central Wavelength):\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e671.6nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e＞90%\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBlocking:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSurface Quality:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eTransmitted Wavefront:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eLambda\/4 or better.\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eParallelism:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg class=\"jz-image-viewer__img urst-none wh-auto ht-auto lazyloaded\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" alt=\"\" width=\"519\" height=\"296\" data-v-b1f4dd62=\"\" data-ll-status=\"loaded\" data-mce-fragment=\"1\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\"\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cbr\u003e\n\u003c\/h4\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem data-mce-fragment=\"1\"\u003eH-Alpha Specifications:\u003c\/em\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eOptical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Thickness:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e2mm+\/-0.05mm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFWHM (Full width at half maximum):\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e4.5nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eCWL (Central Wavelength):\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e656.3nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePeak Transmission:\u003c\/strong\u003e＞90%\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBlocking:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSurface Quality:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eTransmitted Wavefront:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eLambda\/4 or better.\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eParallelism:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg class=\"need_fix lazyloaded\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgo5SZkQYonP3zmgYwwQo4gQY.jpg\" alt=\"Antlia H-alpha 4.5nm EDGE curve.jpg\" width=\"567\" height=\"324\" data-ll-status=\"loaded\" data-mce-fragment=\"1\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgo5SZkQYonP3zmgYwwQo4gQY.jpg\"\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cbr\u003e\n\u003c\/h4\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem data-mce-fragment=\"1\"\u003eOIII Specifications:\u003c\/em\u003e\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eOptical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Thickness:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e2mm+\/-0.05mm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFWHM (Full width at half maximum):\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e4.5nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eCWL (Central Wavelength):\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e500.7nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u0026gt;85%\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBlocking:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSurface Quality:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eTransmitted Wavefront:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eLambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg class=\"need_fix lazyloaded\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg9ouZkQYogL624gMwvwo4gQY.jpg\" alt=\"Antlia OIII 4.5nm EDGE curve.jpg\" width=\"577\" height=\"330\" data-ll-status=\"loaded\" data-mce-fragment=\"1\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg9ouZkQYogL624gMwvwo4gQY.jpg\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSolar imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNight visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Permitted:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSelected Filters\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e","brand":"Antlia","offers":[{"title":"1.25\" Round Mounted \/ SHO Filter Set","offer_id":43780896489701,"sku":"AF-SHO-EDGE-1.25","price":789.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ H-Alpha","offer_id":43780896522469,"sku":"AF-HA-EDGE-1.25","price":263.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Sulfur II","offer_id":43780896588005,"sku":"AF-SII-EDGE-1.25","price":263.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Oxygen III","offer_id":43780896620773,"sku":"AF-OIII-EDGE-1.25","price":263.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ SHO Filter Set","offer_id":43780896653541,"sku":"AF-SHO-EDGE-31","price":828.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ H-Alpha","offer_id":43780896686309,"sku":"AF-HA-EDGE-31","price":276.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ Sulfur II","offer_id":43780896719077,"sku":"AF-SII-EDGE-31","price":276.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ Oxygen III","offer_id":43780896751845,"sku":"AF-OIII-EDGE-31","price":276.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ SHO Filter Set","offer_id":43780896784613,"sku":"AF-SHO-EDGE-36","price":957.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ H-Alpha","offer_id":43780896817381,"sku":"AF-HA-EDGE-36","price":319.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ Sulfur II","offer_id":43780896850149,"sku":"AF-SII-EDGE-36","price":319.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ Oxygen III","offer_id":43780896882917,"sku":"AF-OIII-EDGE-36","price":319.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ SHO Filter Set","offer_id":43780896915685,"sku":"AF-SHO-EDGE-2","price":1233.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ H-Alpha","offer_id":43780896948453,"sku":"AF-HA-EDGE-2","price":411.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Sulfur II","offer_id":43780896981221,"sku":"AF-SII-EDGE-2","price":411.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Oxygen III","offer_id":43780897013989,"sku":"AF-OIII-EDGE-2","price":411.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ SHO Filter Set","offer_id":43780897046757,"sku":"AF-SHO-EDGE-50R","price":1491.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ H-Alpha","offer_id":43780897079525,"sku":"AF-HA-EDGE-50R","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ Sulfur II","offer_id":43780897112293,"sku":"AF-SII-EDGE-50R","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ Oxygen III","offer_id":43780897145061,"sku":"AF-OIII-EDGE-50R","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-sho-4-5nm-narrowband-edge-filters-sho-edge-astronomy-plus-1.webp?v=1690488412"},{"product_id":"antlia-oag-and-filter-drawer-assembly-oagfd","title":"Antlia OAG and Filter Drawer Assembly (OAGFD)","description":"\u003cdiv class=\"J_productTitle title g_minor\" data-mce-fragment=\"1\"\u003e\n\u003ch1 data-mce-fragment=\"1\"\u003eAntlia OAG and Filter Drawer Assembly\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOAG means Off-Axis Guider. Antlia OAG and filter drawer assembly is an innovative accessory that integrates filter drawer and OAG. It allows you to utilize your primary imaging camera and telescope for auto-guiding, without needing a heavy additional guide scope. The OAG uses a small internal pick-off prism as a mirror to reflect part of the incoming light from the telescope to your independent guide camera. Since the off-axis guiding and imaging camera shares the same image train as the main detector, it handles very well with all bending and tilting that may be present in your setup, and you will achieve tracking accuracy greater than you would with a separate guide scope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia OAG and Filter Drawer Assembly Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLarge pick-out prism 12*12mm, which allows the use of a larger guiding sensor and therefore a greater selection of guide stars.\u003c\/li\u003e\n\u003cli\u003eMono-block (one-piece) design with the OAG body directly connected to the filter drawer.\u003c\/li\u003e\n\u003cli\u003eComfortably fits APS-C sensor and Full Frame sensor.\u003c\/li\u003e\n\u003cli\u003eThe total thickness plus both side adapters are 37.5mm.\u003c\/li\u003e\n\u003cli\u003eIt’s right for cameras with 17.5mm back focus distance without additional adapters.\u003c\/li\u003e\n\u003cli\u003eThe OAG has been CNC machined from a single aluminium block and provides a very rigid platform for guiding.\u003c\/li\u003e\n\u003cli\u003eHigh-quality helical focuser assembly, a 1.25-inch helical focuser with a generous 10mm of travel allows you will find the optimum focus for your guide star.\u003c\/li\u003e\n\u003cli\u003eThe prism height can be adjusted to better illuminate the field of view of your auto guider. The smaller the imaging sensor in your camera the further down the prism can be set without interfering with the sensor.\u003c\/li\u003e\n\u003cli\u003eDovetail-type threaded adapters are attached to the body with grub screws, so the adapters can be 360° rotated and locked to align with the telescope and camera.\u003c\/li\u003e\n\u003cli\u003eYou can rotate the OAG 360° to find a guide star.\u003c\/li\u003e\n\u003cli\u003eA wide variety of adapters is provided to accompany multiple configurations. Antlia OAG includes 7 popular threaded sizes: M42, M48, M54, and M68 male and female for both sides. (no M42 female)\u003c\/li\u003e\n\u003cli\u003eApplication is not limited to a specific brand instrument.\u003c\/li\u003e\n\u003cli\u003eFilter sliders of Dia50mm and 50X50mm, adapter rings of B-48125,B-4836,B-4831 and other adapters can be ordered separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eThe Standard Antlia OAG and Filter Drawer Attached to Imaging Setup\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"OAG on equipments 01.JPG\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgm_mflwYomMGm9QQwmRw4ohU.jpg\" width=\"476\" height=\"359\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe OAG requires a telescope, imaging camera, autoguider, and a mount tracking equatorially with autoguiding capability. Please refer to Schematic diagram 02 to familiarize with the Antlia OAG.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"OAG on equipments 02.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg0umflwYoiPzzJTCwCziSCA.jpg\" width=\"484\" height=\"346\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou need to ensure that the distance from the prism to the main camera sensor is exactly equal to the distance from the prism to the guider sensor.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eParts List in Antlia OAG\u0026amp; Filter Drawer set:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1 x Off-Axis Guider Body, 1 x Helical Focuser, 1 x 2-inch (M48*0.75) Filter Slider, 1 x M42-Male Adapter, 1 x M48-Male Adapter, 1 x M48-Female Adapter,1 x M54-Female Adapter, 1 x M54-Male Adapter, 1 x M68-Female Adapter, 1 x M68-Male Adapter, 1 x M42-6mm*1 for 12.5mm BFD, 1 x M42-1.25-27mm\u003c\/p\u003e\n\u003cp\u003eIf you want to replace 2-inch (M48*0.75) Filter Slider with Dia50mm or 50x50mm, please contact Antlia or our resellers before order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParts to be ordered separately from Antlia that you may require to use with OAG:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFilter Slider Dia50mm, Filter Slider 50x50mm, 2-inch Filter Slider and Adapters Rings of B-4836, B-4831, B-48125.\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43628339462373,"sku":"AF-OAGFD","price":355.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-oag-and-filter-drawer-assembly-oagfd-astronomy-plus-1.webp?v=1690488412"},{"product_id":"antlia-h-beta-and-oiii-filter-1-25","title":"Antlia H-beta and OIII Filter 1.25″","description":"\u003ch2 data-mce-fragment=\"1\"\u003eAntlia H-beta and OIII Filter – 1.25″\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWhen it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMain Application and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSince human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer’s eyes.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003e\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003eOxygen III\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003eOxygen III\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003eH-Beta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003e500.7nm\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e495.9nm\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eBlocking\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eOD4@ 300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eOptical, Single, Non-glued substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eLambda\/4 or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eParallelism\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eless than 30 arcsec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43628340019429,"sku":"AF-HB-OIII125","price":140.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-h-beta-and-oiii-filter-1-25-astronomy-plus-1.webp?v=1690488414"},{"product_id":"antlia-sho-7nm-narrowband-prime-filters-36mm-sho-prime","title":"Antlia SHO 7nm Narrowband Prime Filters 36mm (SHO-PRIME)","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia SHO 7nm Prime Narrowband Pro Filters\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia SHO Prime narrowband filter optimizes the FWHM (full width half maximum) to 7nm bandpass. The suppression of optical density is (OD)4 on unwanted wavelengths.The excellent optical coating characteristics found in the Antlia 3nm Pro series has been incorporated into the 7nm Prime narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia H-Alpha 7nm Prime filters are designed to deliver 90% transmittance at the CWLHa 656.3nm lines that provides you with the maximum signal and well-defined nebulae structures. Besides, it is wide enough (7nm bandwidth) to pass emission lines at NII 654.8nm and NII 658.3nm.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia OIII 7nm Prime filters are designed to deliver 90% transmission at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII nebulae structures and the SII 7nm Prime filters are designed to deliver 90% transmittance at Central Wavelength SII 671.6nm.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe out of band blocking specification is rated OD4 (0.01%) which delivers an excellent SNR(signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths.Improved sharp cut off astrophotography 7nm Prime filters are designed to minimize halos around bright stars. Antlia 7nm Prime filters can be used with nearly all systems as fast as f\/2 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e90% transmittance at Central Wavelength H-alpha 656.3nm line \/ OIII 500.7nm \/ SII 671.6nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFWHM is wide enough to pass both H-alpha and NII lines\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWith wider FWHM, 7nm Prime narrowband filters can be used with fast optics of f\/2 with minimal loss of signal Steep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eA single substrate to eliminate internal reflections Narrowband Objects: H-alpha,NII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThis filter is effective for deep sky objects that contain H-alpha and NII emissions\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgverRlwYoxv2YygMwwQo4-wU.jpg\" width=\"590\" height=\"336\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"Antlia OIII 7nm Prime filter spectrum curve.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgvvrWlwYo6PCs8AQwwgo4gAY.jpg\" width=\"630\" height=\"360\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"Antlia SII 7nm Prime filter spectrum curve.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgovTWlwYo2eHkzwcwwQo4gAY.jpg\" width=\"580\" height=\"331\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specification \u003c\/h3\u003e\n\u003ch4\u003e\u003cem\u003eSII Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness:\u003c\/strong\u003e 2mm+\/-0.05mm for Dia36mm unmounted\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e7nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e671.6nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e ＞90%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003c\/strong\u003e \u0026gt; 4OD(0.01% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality\u003c\/strong\u003e: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003c\/strong\u003e Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003c\/strong\u003e less than 30 arcsec\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cem\u003eH-Alpha Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate: \u003c\/strong\u003eOptical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness:\u003c\/strong\u003e 2mm+\/-0.05mm for Dia36mm unmounted\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e7nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e656.3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission: \u003c\/strong\u003e＞90%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003c\/strong\u003e \u0026gt; 4OD(0.01% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003c\/strong\u003e S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003c\/strong\u003e Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003c\/strong\u003e less than 30 arcsec\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cem\u003eOIII Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness: \u003c\/strong\u003e2mm+\/-0.05mm for Dia36mm unmounted\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e7nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e500.7nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission: \u003c\/strong\u003e＞90%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003c\/strong\u003e \u0026gt; 4OD(0.01% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003c\/strong\u003e S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003c\/strong\u003e Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism: \u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia SII 3nm Pro filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the SII signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/p\u003e\n\u003cp\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilters\u003c\/p\u003e\n\u003cp\u003eCase\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Antlia","offers":[{"title":"H-Alpha","offer_id":43786138616037,"sku":"AF-HA-PRIME-36","price":224.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III","offer_id":43786138648805,"sku":"AF-OIII-PRIME-36","price":224.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur II","offer_id":43786138681573,"sku":"AF-SII-PRIME-36","price":224.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set","offer_id":43786138714341,"sku":"AF-SHO-PRIME-36","price":672.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-sho-7nm-narrowband-prime-filters-36mm-sho-prime-astronomy-plus-1_79a9ac95-3930-4403-a6fa-553880691453.jpg?v=1690488424"},{"product_id":"antlia-lrgb-v-filters","title":"Antlia LRGB-V Pro Filters","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia LRGB-V Pro Filters\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. Suitable sensors include KAF\/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The LRGB-V Pro set is designed to approximately equalize the RGB response from the flux of red-sensitive CCD detectors. The result is that you achieve 1:1:1 equalized RGB exposures with the benefit of simplified post processing and reduced imaging time. New LRGB-V Pro series filters feature a carefully designed spectral gap between the green and red channels to minimize the effect of light pollution and to provide high transmittance of useful frequencies. The filters’ design maximizes the capture of details from fainter galaxies and nebulae emissions. The LRGB-V Pro series filters guarantee the high transmission of the OIII band in both the B and G filters (OIII signal \u0026gt;95% in blue and green). The bandwidth of the B channel is narrowed for the purpose of improving the blue channel overflow (haloing) around the star due to B channel overexposure. Antlia LRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R filters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results in a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all Antlia filters.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHighlight of LRGB-V Pro series set\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e1. Premium coating technology and finely polished substrate Our quality selection processes are optimized to ensure highly homogeneous glass-substrates. Our application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters. 2. Maximized colour balance and contrast for each of the three RGB channels and excellent S\/N performance Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The Anti reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e3. Tighter star profiles and halo reduction The cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e1. Designed for monochrome CCD and CMOS cameras\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e3. AR anti-reflection film design for secondary reflection and star halo reduction\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e4. R-Filter provides maximum transmission of H-alpha and S II emission\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e5. B\/G overlap doubles the energy in the OIII line\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e9. Not recommended for Solar observing and imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e10. Not recommended for visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eImportant Note:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eWhen using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eoptical substrate\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Thickness:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e2mm+\/-0.05mm for 1.25’’\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSurface Quality:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eTransmitted Wavefront:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eParallelism:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e1.25’’(M28.5*0.6) or 2’’(M48*0.75)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBlack anodized finish Laser engraving\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNo fading\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eLRBG (4) Filters \u003cbr\u003e\u003c\/p\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"1.25\" Round Mounted","offer_id":43780813684965,"sku":"AF-LRGB-V-1","price":426.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":43780813717733,"sku":"AF-LRGB-V-31","price":454.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":43780813750501,"sku":"AF-LRGB-V-36","price":511.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":43780813783269,"sku":"AF-LRGB-V-2","price":667.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":43780813816037,"sku":"AF-LRGB-V-50","price":852.0,"currency_code":"CAD","in_stock":true},{"title":"50mm x 50mm Square Unmounted","offer_id":48235207557349,"sku":"AF-LRGB-V-50x50-SQUARE","price":1065.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-lrgb-v-filters-astronomy-plus-1.webp?v=1690488424"},{"product_id":"antlia-cak-3nm-393-3nm-filter-1-25-mounted-cak-1-25","title":"Antlia CaK 3nm 393.3nm filter - 1.25'' Mounted (CAK-1.25)","description":"\u003ch2\u003eAntlia CaK 3nm 393.3nm filter\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia Solar Wedge prism and internal CaK solar filter are made of heat resistant double-polished substrate. Antlia CaK 393.3nm solar filter uses the most advanced multicoatings to produce a sharp 3nm narrow bandpass, designed to maximize contrast for high-resolution imaging of sun spots, solar surface granulation and other features that are prominent in CaK light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA high blocking specification of OD5 (0.001%) between 200-1200nm wavelengths and OD3 (0.1%) between 1200-1500nm wavelengths delivers superb resolution for imaging with the Antlia Cak 3nm solar filter.   It should be noted that the bandpass for Cak (393nm) makes solar features almost invisible to human vision because of the eye's low sensitivity and poor resolving ability at the CaK frequency. Hence, the Antlia Solar Wedge with CaK filter is not recommended for visual observation. It is designed for imaging with cameras that have spectral responses well beyond human vision.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNever look into the sun with the K-Line filter alone, although you don’t perceive it, there is a lot of harmful UV radiation entering your eye.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease note Cak \u003c\/span\u003e\u003cspan\u003e3nm 393.3nm filter is screwed in Antlia \u003c\/span\u003e\u003cspan\u003eHerschel Wedge Prism. You do not need to buy it separately if you use our Herschel Wedge Prism.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWarranty \u0026amp; Manual\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty Against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43786170499301,"sku":"AF-CAK-1.25","price":340.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-cak-3nm-393-3nm-filter-1-25-mounted-cak-1-25-astronomy-plus_cb04a2f3-735a-4663-8488-9a2d0fa1ec18.jpg?v=1690488622"},{"product_id":"antlia-ir-pass-685nm-planetary-1-25-filter","title":"Antlia IR Pass 685nm Planetary 1.25\" Filter","description":"\u003ch2\u003eAntlia IR Pass 685nm planetary 1.25\" filter\u003c\/h2\u003e\n\u003cp\u003eThe Antlia IR Pass 685nm filter is an absorptive filter that allows infrared light with wavelengths of more than 685nm to pass through. At these longer wavelengths, the sensitivity of the unaided eye is reduced, so it is not suitable for visual observations. The filter is highly recommended for any planetary photography. At long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. The closer to the infrared band, planetary images are less disturbed by wavefront distortions in the atmosphere (seeing), result in the sharpest and highest contrast image possible.\u003c\/p\u003e\n\u003cp\u003eBy combining a luminance image taken with the IR-Pass filter, along with RGB and U-Venus filters, overall image sharpness is significantly enhanced and details of planets in different bands are taken.\u003c\/p\u003e\n\u003cp\u003eThe filter is also possible to image the other planets during daylight due to the dark background sky created by the 685nm IR Pass Filter.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specification\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e1.25” mounted, (2mm+\/-0.05mm)\u003c\/p\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/p\u003e\n\u003cp\u003e30 arcsec parallelism\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1.25”( 28.5*0.6 )\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43786208149733,"sku":"AF-IR685-1.25","price":55.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-ir-pass-685nm-planetary-1-25-filter-astronomy-plus_86bb607a-63cf-4af6-8259-232a1183e55d.jpg?v=1690488639"},{"product_id":"copy-of-antlia-ir-pass-850nm-planetary-1-25-filter","title":"Antlia IR Pass 850nm Planetary 1.25\" Filter","description":"\u003ch2\u003eAntlia IR Pass 850nm planetary 1.25\" filter\u003c\/h2\u003e\n\u003cp\u003eThe Antlia IR Pass 850nm filter is an absorptive filter that allows infrared light with wavelengths of more than 850nm to pass through. It is a supplement filter of IR Pass 685nm. At these longer wavelengths, the sensitivity of the unaided eye is reduced, so it is not suitable for visual observations. The filter is highly recommended for any planetary photography. At long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. The closer to the infrared band, planetary images are less disturbed by wavefront distortions in the atmosphere (seeing), result in the sharpest and highest contrast image possible.\u003c\/p\u003e\n\u003cp\u003eBy combining a luminance image taken with the IR-Pass filter, along with RGB and U-Venus filters, overall image sharpness is significantly enhanced and details of planets in different bands are taken.\u003c\/p\u003e\n\u003cp\u003eThe filter is also possible to image the other planets during daylight due to the dark background sky created by the 850nm IR Pass Filter.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specification\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e1.25” mounted, (2mm+\/-0.05mm)\u003c\/p\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/p\u003e\n\u003cp\u003e30 arcsec parallelism\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1.25”( 28.5*0.6 )\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43786213851365,"sku":"AF-IR850-1.25","price":55.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-ir-pass-850nm-planetary-1-25-filter-astronomy-plus_2a6772f7-696f-44bd-9583-b4a4846a97f9.jpg?v=1690488639"},{"product_id":"antlia-imaging-herschel-wedge-with-35mm-prism-and-1-25-cak-3nm-solar-filter","title":"Antlia Imaging Herschel Wedge with 35mm Prism and 1.25'' Cak 3nm Solar Filter","description":"\u003ch2\u003eAntlia Imaging Herschel Wedge with 35mm Prism and 1.25'' Cak 3nm Solar Filter\u003c\/h2\u003e\n\u003cp\u003eThe Antlia Solar Wedge (Herschel Wedge design) replaces the standard prism diagonal at the rear of refractor telescopes to enable imaging of solar granulation and sunspots. The Herschel Wedge design is well known to give sharper, higher-contrast images. The Antlia Solar Wedge design transmits a greatly reduced, safe amount of light to your imaging camera. The image brightness can be conveniently increased or decreased using a control ring with aperture blades, similar to that used in camera lenses.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eOur Herschel Wedge is produced using CNC machining and the optical components are multi-coated with anti-reflection coatings to minimize both internal reflections and contrast reducing stray light. The solar wedge incorporates an Antlia 3nm narrow bandpass filter at the Calcium II K-Line centered on 393.3nm and mounted in a standard 1.25’’ holder.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eUnlike some other solar wedge designs which may get too hot, the Antlia Imaging Solar Wedge directs energy into an extra thick Polycrystalline Ceramic diffuser plate at the rear of the Wedge. In addition, cooling vents above the ceramic plate facilitate efficient cooling of the system.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Antlia Cak 3nm solar prism system provides for the safe management of harmful light intensity and heat when imaging the sun. The system is comprised of a prism, Cak lens filter, sun centering finder and a heat dissipation system. The sun’s light passes through the right-angle prism and excess heat is transferred to the rear fins that act as a heat sink for cooling the instrument. This heat management system effectively keeps the the instrument at safe operating temperatures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Antlia Herschel Wedge is intended for imaging ONLY. It is not suitable for visual observation.\u003c\/p\u003e\n\u003cp\u003eIt is not intended for solar prominence imaging and visual.\u003c\/p\u003e\n\u003cp\u003eMust only be used with refractor telescopes to avoid damage to the unit.\u003c\/p\u003e\n\u003cp\u003eRefractor aperture must be no larger than 120mm or, focal ratio of F5.5 or longer.\u003c\/p\u003e\n\u003cp\u003eNever use the Solar wedge without the supplied narrowband filter. Otherwise irreparable eye damage can result.\u003c\/p\u003e\n\u003cp\u003eDisassembly of prism is prohibited and voids warranty. Any repair\/returns\/exchange for this item is not accepted once it has been disassembled.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eType of build: Herschel 35mm prism\u003c\/p\u003e\n\u003cp\u003eIntegrated ceramic heat dispersion diffuser\u003c\/p\u003e\n\u003cp\u003eSharp CaK 3nm 393.3nm solar filter screwed into eyepiece holder base\u003c\/p\u003e\n\u003cp\u003eHigh-resolution imaging of granulation, sunspots, and other features\u003c\/p\u003e\n\u003cp\u003eIncludes a brightness control, a solar finder and effective heat dissipation system\u003c\/p\u003e\n\u003cp\u003eAnti Reflection (AR) coated prism and solar filter\u003c\/p\u003e\n\u003cp\u003eHigh blocking specification to reject solar heat ingress\u003c\/p\u003e\n\u003cp\u003eSturdy CNC machined construction\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCaK 3nm 393.3nm Filter Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Antlia Solar Wedge prism and internal CaK solar filter are made of heat resistant double-polished substrate. Antlia CaK 393.3nm solar filter uses the most advanced multicoatings to produce a sharp 3nm narrow bandpass, designed to maximize contrast for high-resolution imaging of sun spots, solar surface granulation and other features that are prominent in CaK light.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eA high blocking specification of OD5 (0.001%) between 200-1200nm wavelengths and OD3 (0.1%) between 1200-1500nm wavelengths delivers superb resolution for imaging with the Antlia Cak 3nm solar filter.   It should be noted that the bandpass for Cak (393nm) makes solar features almost invisible to human vision because of the eye's low sensitivity and poor resolving ability at the CaK frequency. Hence, the Antlia Solar Wedge with CaK filter is not recommended for visual observation. It is designed for imaging with cameras that have spectral responses well beyond human vision.\u003c\/p\u003e\n\u003cp\u003eNever look into the sun with the K-Line filter alone, although you don’t perceive it, there is a lot of harmful UV radiation entering your eye.\u003c\/p\u003e\n\u003ch3 style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003eIn the Box \u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia Imaging Herschel Wedge with 35mm Prism\u003c\/li\u003e\n\u003cli\u003e1.25'' Cak 3nm Solar Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWarranty \u0026amp; Manual\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia Warranty guarantee: 1 year\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43881512599781,"sku":"AF-CaK3nm-SW","price":481.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-imaging-herschel-wedge-with-35mm-prism-and-1-25-cak-3nm-solar-filter-astronomy-plus-1.webp?v=1690488750"},{"product_id":"antlia-filter-drawer-and-adapters-parts-only","title":"Antlia Filter Drawer and Adapters","description":"\u003ch1\u003eAntlia Filter Drawer and Adapters\u003c\/h1\u003e\n\u003cp\u003e\u003cem\u003eThe filter drawer system is a very convenient and inexpensive alternative to the filter wheel for simple changing of filters and connection of camera and telescope.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eAntlia drawer system is composed of three parts, mainbody base with an optical depth of 20mm, telescope adapter and camera adapter, three parts are connected and fixed by screws. All parts of the Antlia filter drawer system are made of aviation aluminum CNN.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eDue to optical depth of 20mm, it can be used also with scopes with a high focal ratio.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eIn the drawer system, the mainbody are abbreviated with (B) for base, the adapters are abbreviated with (T) for telescope side and (C) for camera side.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: #d22525;\"\u003e\u003cstrong\u003ePlease note: If you want to buy it as a kit, I suggest looking into this product. \u003ca href=\"https:\/\/astronomyplus.com\/products\/antlia-filter-drawer-and-adapters?_pos=1\u0026amp;_sid=c981e247a\u0026amp;_ss=r\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eClick Here\u003c\/a\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003e\u003cimg height=\"568\" width=\"1166\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAguNCyigYosaWHygEwki44vhY.jpg\" alt=\"Antlia filter drawer layout.jpg\"\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTwo specifications of filter sliders are provided. Double strong magnets create stronger adsorption and easier installing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2inch M48*0.75 thread can be used with the 2'' mounted filters. (\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eB-2INCH\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eD50mm thread can be used with the round 50mm unmounted filters. (\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eB-50\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThree filter holders allow you to use the filter with a smaller filter thread size. No need to buy another set of filter drawer\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eor slider when you buy new cameras or telescopes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eB-4836\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e filter holder mounted into B-2INCH slider can help you directly fit the 36mm unmounted filter onto 2” filter drawer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eB-4831\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e filter holder mounted into B-2INCH slider can help you directly fit the 31mm unmounted filter onto 2” filter drawer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eB-48125\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e filter holder mounted into B-2INCH slider can help you directly fit the 1.25'' mounted filter onto 2” filter drawer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgttCyigYokK-K8gYwxAs47AY.jpg\" width=\"914\" height=\"542\" alt=\"Connection of filter drawer,slider and adaper.jpg\" class=\"need_fix\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgttCyigYogIXqmQMwmgo40gY.jpg\" width=\"776\" height=\"505\" alt=\"The mainbody base drawing.jpg\" class=\"need_fix\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe main body of the filter drawer system is avai\u003c\/span\u003e\u003cspan\u003el\u003c\/span\u003e\u003cspan\u003eable with a wide\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003erange of threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe screws are used to connect base and adapters. Four pieces of Hexagon   socket   screws   are   equipped   and   also installation tools are provided. The system is   designed in a such convenient\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eway,   that it is possible to mount all popular equipment\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e found on the world. You can also adjust the position of the camera and telescope very well.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg height=\"841\" width=\"1118\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antliafilterdrawer_480x480.png?v=1676054094\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"T-42","offer_id":43894706995429,"sku":"AF-T42","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"T-48","offer_id":43894707028197,"sku":"AF-T48","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"T-52","offer_id":43894707060965,"sku":"AF-T52","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"T-54","offer_id":43894707093733,"sku":"AF-T54","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"T-SCT","offer_id":43894707126501,"sku":"AF-TSCT","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"T-2inches","offer_id":43894707159269,"sku":"AF-T2INCH","price":25.0,"currency_code":"CAD","in_stock":true},{"title":"T-68","offer_id":43894707192037,"sku":"AF-T68","price":31.0,"currency_code":"CAD","in_stock":true},{"title":"T-C9.25C11 (HD)","offer_id":43894707224805,"sku":"AF-TC925C11","price":49.0,"currency_code":"CAD","in_stock":true},{"title":"T-RASAC9.25C11","offer_id":43894707257573,"sku":"AF-TRASAC925C11","price":62.0,"currency_code":"CAD","in_stock":true},{"title":"B001 (Mainbody)","offer_id":43894709190885,"sku":"AF-B001","price":49.0,"currency_code":"CAD","in_stock":true},{"title":"B-50","offer_id":43894709223653,"sku":"AF-B50","price":35.0,"currency_code":"CAD","in_stock":true},{"title":"B-2inches","offer_id":43894709256421,"sku":"AF-B2INCH","price":35.0,"currency_code":"CAD","in_stock":true},{"title":"B-4836 (36mm Filter Adapter)","offer_id":43894709289189,"sku":"AF-B4836","price":11.0,"currency_code":"CAD","in_stock":true},{"title":"B-4831 (31mm Filter Adapter)","offer_id":43894709321957,"sku":"AF-B4831","price":11.0,"currency_code":"CAD","in_stock":true},{"title":"B-48125 (1.25mm Filter Adapter)","offer_id":43894709354725,"sku":"AF-B48125","price":11.0,"currency_code":"CAD","in_stock":true},{"title":"C-42","offer_id":43894705094885,"sku":"AF-C42","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"C-48","offer_id":43894705127653,"sku":"AF-C48","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"C-52","offer_id":43894705160421,"sku":"AF-C52","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"C-54","offer_id":43894705193189,"sku":"AF-C54","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"C-SCT","offer_id":43894705225957,"sku":"AF-CSCT","price":14.0,"currency_code":"CAD","in_stock":true},{"title":"C-2inches","offer_id":43894705258725,"sku":"AF-C2INCH","price":25.0,"currency_code":"CAD","in_stock":true},{"title":"C-68","offer_id":43894705291493,"sku":"AF-C68","price":42.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-filter-drawer-and-adapters-parts-only-astronomy-plus-1_911aab85-8c07-453d-ac57-1cba6165f053.jpg?v=1690488806"},{"product_id":"antlia-photometric-sloan-filters-1","title":"Antlia Photometric Sloan Filters","description":"\u003ch2\u003eAntlia Photometric Sloan Filters\u003c\/h2\u003e\n\u003cp\u003eThe Sloan Digital Sky Survery (SDSS) photometric system is the most common filter set used by observatory today. Antlia Photometric Sloan filter set includes four filters covering 400nm to the sensitivity limit of silicon CCD cameras near 1100nm. Ion Gun Assisted Deposition coating technology on the double-sided polished substrate makes them the most consistent, durable and accurate filters. Antlia Sloan filters have almost total suppression of optical density (OD)5，the result is that our photometric sloan filters minimize the already small leakage and create a superior contrast.\u003c\/p\u003e\n\u003cp\u003eSpectrum curve:\u003c\/p\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 1.5em;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 1.5em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto;\" alt=\"2022 Antlia Photometric Sloan Filters.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg3qWklwYonMbsigIw6wg47gU.jpg\" data-mce-style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg3qWklwYonMbsigIw6wg47gU.jpg\" width=\"1131\" height=\"750\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWider transmission windows, which allow fainter objects to be measured in a shorter time\u003c\/li\u003e\n\u003cli\u003eAntlia Sloan griz' filter set is suitable from f\/15 to f\/1.8\u003c\/li\u003e\n\u003cli\u003ePeak transmission guaranteed \u0026gt; 98%（g’＞95%）\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards, with utmost care for parfocality\u003c\/li\u003e\n\u003cli\u003eEach filter coated individually, NOT cut out of a larger coatings plate\u003c\/li\u003e\n\u003cli\u003e1\/4-wave propagated wavefront prior to coating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 1.5em;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 12px;\" data-mce-style=\"text-size-adjust: 100%; font-size: 12px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"text-size-adjust: 100%; clear: both; border-collapse: collapse; word-break: break-all; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\" data-mce-style=\"text-size-adjust: 100%; clear: both; border-collapse: collapse; word-break: break-all; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\" width=\"566\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\n\u003ctr style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" width=\"95\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eFilter Name\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" width=\"108\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eWavelength\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" width=\"103\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" width=\"111\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eBlocking\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border: 1px solid #000000;\" width=\"148\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; 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padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"95\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eg’\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"108\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e400-550nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"103\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e95%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"111\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e≥OD5\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"148\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e3mm+\/-0.05mm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"95\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003er’\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"108\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e555-705nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"103\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e98%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"111\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e≥OD5\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"148\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e3mm+\/-0.05m\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003em\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"95\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ei’\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"108\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e688-850nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"103\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e98%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"111\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e≥OD5\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"148\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; 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font-size: 13px;\"\u003ez’\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"108\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: 宋体;\" data-mce-style=\"text-size-adjust: 100%; font-family: 宋体;\"\u003e＞\u003c\/span\u003e8\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\" data-mce-style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e12\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003enm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"103\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e98%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"111\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e≥OD5\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" data-mce-style=\"text-size-adjust: 100%; padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" width=\"148\" valign=\"top\"\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\" data-mce-style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e3mm+\/-0.05mm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 1.5em;\" data-mce-style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 1.5em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 12px; font-family: Arial;\" data-mce-style=\"text-size-adjust: 100%; font-size: 12px; font-family: Arial;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cbr style=\"text-size-adjust: 100%;\" data-mce-style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\n\u003cp\u003eDue to the mediocre quantum efficiency of the cameras in ultraviolet band range, Antlia do not produce u’ (300nm-400nm) filter.\u003c\/p\u003e\n\u003cp\u003eThe Antlia Photometric Sloan Filters set can be purchased individually.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg_4KCnAYowsXOywcwxQk4iAY.jpg\" alt=\"Triband RGB Ultra Spectrum Curve.jpg\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg_4KCnAYowsXOywcwxQk4iAY.jpg\" width=\"584\" height=\"371\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eAntlia Photometric Sloan Filters (4pcs)\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan mce-data-marked=\"1\"\u003eManual \u0026amp; Warranty\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan mce-data-marked=\"1\"\u003eAntlia 3-Years Warranty\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":44023513481445,"sku":"AF-SLOAN-50","price":1988.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-photometric-sloan-filters-astronomy-plus.webp?v=1690490020"},{"product_id":"antlia-alp-t-dual-band-5nm-sii-hb-filter-1","title":"Antlia ALP-T 2\" Dual Band 5nm SII \u0026 Hb Filter","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb Filter\u003c\/h1\u003e\n\u003cp\u003eThe ALP-T dual band 5nm SII\u0026amp;Hb filter is a dual line-pass filter, which lets the deep red Sulfur-II line and the blue Hydrogen-Beta line through and is used with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It is a significant addition to the\u003cbr data-mce-fragment=\"1\"\u003epopular Antlia ALP-T dual band 5nm Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with greater contrast against the background than without it. The combination of these two dual band filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various colour palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O etc.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWhy design SII\u0026amp;Hb bands pass instead of OIII\u0026amp;SII bands?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eThe filter is dedicated to capture H-beta and SII emission lines. We know that SII is singly ionized sulfur that emits light in the deep red part of the spectrum, beyond H-alpha, but the contribution of H-beta to emission lines in nebulae is frequently overlooked, even though it is the second most common Hydrogen emission after the H-alpha line. Capturing more OIII will boost the existing signal but does not give more information. However Hb has the potential to reveal structures not seen using OIII. The design is to capture the H-beta emission line in the certain nebulas that contain some blue spectrum, this cannot be captured by H-alpha, SII and OIII filters. Greater and richer details will be captured in many nebulae images to achieve results with a superior signal-to-noise ratio.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIt is generally accepted that the OIII signal is a relatively weaker contributor to nebulae images. The OIII bandpass sensitivity is an important consideration for any nebulae filter. Most colour cameras (OSC) use a RGGB Bayer pattern. The allocation of twice as many green pixels as\u003cbr data-mce-fragment=\"1\"\u003ecompared to either red or blue pixels, enables a much-improved capture of the OIII signal. Furthermore, higher OIII signal can be achieved by additional exposure using the Antlia ALP-T Ha\u0026amp;O3 filter, then isolating the GB channels, followed by synthesis of an OIII channel to add into your stack.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e In the situation where you may only want to add SII to your Ha\u0026amp;OIII data, then it may be preferable to buy one SII narrowband filter and achieve a cleaner SII spectral emission. However, our new filter design (SII\u0026amp;Hb) includes the H-beta emission line which provides a distinct improvement in nebulae contrast and improved feature separation in Hb areas.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm Ha\u0026amp;OIII filter:\u003c\/strong\u003e Dual band filter with a very narrow passband of 5nm in OIII and H-alpha to achieve a higher signal-to-noise ratio. The resulting contrast improvement for OSC is impressive.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb filter:\u003c\/strong\u003e Dual band filter with a very narrow pass band of 5nm H-beta and S-II. This filter is ideal for increasing contrast of nebulae that emit in the sulfur and H-beta range using OSC. It provides additional feature separation and isolation in Hb areas.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe advanced multi-coatings on Antlia ALP-T dual band filters effectively isolates the red, Ha line, blue-green, OIII line, deep red SII and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band 5nm Ha\u0026amp;OIII and SII\u0026amp;Hb filter creates a superior signal-to-noise ratio and better contrast in your OSC images.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eThe main features and application\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003ePasses SII 672.4nm line and H-Beta 486.1nm line;\u003cbr data-mce-fragment=\"1\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras;\u003cbr data-mce-fragment=\"1\"\u003eUltra FWHM 5nm allows for increasing in exposure time;\u003cbr data-mce-fragment=\"1\"\u003eRecommended to be used with ALP-T Dual Band 5nm Ha\u0026amp;OIII filter to create images with better signal to noise and better isolation between the 4 channels;\u003cbr data-mce-fragment=\"1\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves signal-to-noise;\u003cbr data-mce-fragment=\"1\"\u003eExtremely steep bandpass and blackened edges of unmounted sizes to minimize internal reflections;\u003cbr data-mce-fragment=\"1\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts;\u003cbr data-mce-fragment=\"1\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter;\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSolar imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNight visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications \u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003ctable align=\"LEFT\" border=\"1\" width=\"585px\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003eSulfur-II\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003eHydrogen-Beta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e672.4nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e90%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eBlocking\u003c\/td\u003e\n\u003ctd valign=\"top\" rowspan=\"1\" colspan=\"2\" data-mce-fragment=\"1\"\u003e≥OD4.5 \u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd valign=\"top\" colspan=\"2\" data-mce-fragment=\"1\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb Filter\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia \u003cspan data-mce-fragment=\"1\"\u003e3-Years Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":44097503002853,"sku":"AF-ALP-T-2-SIIHB","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-2-dual-band-5nm-siiandhb-filter-astronomy-plus-1.webp?v=1690490638"},{"product_id":"antlia-2-5nm-sho-ultra-filter-2-mounted","title":"Antlia 2.5nm SHO Ultra Narrowband Filters 2’’ \u0026 36mm","description":"\u003ch1\u003eAntlia 2.5nm SHO Ultra Filter 2’’ \u0026amp; 36mm\u003c\/h1\u003e\n\u003cp\u003eThe Antlia SHO 2.5nm Ultra series filters are made with quartz glass and undergo precisely controlled coating processes to ensure optimal performance. The 2.5nm Ultra series is designed with a FWHM (full width half maximum) of 2.5nm +0.3\/-0.1nm and a transmission efficiency \u0026gt;93-95% at the Central Wavelength.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eThe quartz glass possesses an ultra-low thermal expansion coefficient with outstanding thermal and mechanical properties. When combined with advanced coating processes, these filters exhibit remarkable durability for imaging and research in the most challenging environmental conditions.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eCompared to the 3nm Pro series, the 2.5nm Ultra series coated on quartz glass exhibits higher transmittance with Ha\/SII≥95% and OIII≥93%. These filters are estimated to improve signal by 20-30% in your images. Additionally, the Ultra series boasts a narrower FWHM of 2.5nm+0.3\/-0.1nm, resulting in an exceptionally high Signal to Noise Ratio for deep sky photography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe main features and application:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e- High transmittance （Ha\/SII≥95%，OIII≥93%）and the narrow FWHM 2.5nm +0.3\/-0.1nm to maximize contrast;\u003c\/li\u003e\n\u003cli\u003e- Flat-top spectrum minimizes the loss in transmission due to the Center Wavelength (CWL)-shift;\u003c\/li\u003e\n\u003cli\u003e- Out of band blocking specification is designed to OD5 (0.001%) to block interference from other wavelengths and minimize halos around bright stars;\u003c\/li\u003e\n\u003cli\u003e- Made of quartz glass, excellent durability and thermal stability, better fracture resistance and scratch resistance, improved coating resilience to cleaning;\u003c\/li\u003e\n\u003cli\u003e- Filters are resistant to scratches；\u003c\/li\u003e\n\u003cli\u003e- Identical filter thickness to existing standards and double-sided fine polishing , with utmost care for parfocality;\u003c\/li\u003e\n\u003cli\u003e- The SHO 2.5nm Ultra filters are recommended for use in optics with a Focus Ratio of ≥ f\/3.5 for best optical performance;\u003c\/li\u003e\n\u003cli\u003e- 100% of production are scanned individually, all transmission and blocking (OD) data in the box are actual, measured spectra and transmission；\u003c\/li\u003e\n\u003cli\u003e- All Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light；\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAntlia standard ring: 2’’(M48*0.75)\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSolar imaging\u003c\/p\u003e\n\u003cp\u003eNight visual observation\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum Curves:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e\u003c\/span\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"Ha 2.5nm ultra.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgg_S1owYo3c-58wQwwQo4-wU.jpg\" width=\"1345\" height=\"767\"\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"OIII 2.5nm ultra.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgg_S1owYorqjy_wEwwQo4-wU.jpg\" width=\"1345\" height=\"767\"\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"SII 2.5nm ultra.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgg_S1owYoxoH3HjDDCjiABg.jpg\" width=\"1347\" height=\"768\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse; font-family: Calibri; font-size: 11pt; color: #000; background-color: transparent;\" 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cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: nowrap; text-align: left; vertical-align: top; border-right: 1px solid #000000; border-left: 1px solid #000000; border-top: 1px solid #000000;\"\u003e\u003cspan style=\"font-family: Times New Roman; font-size: 10pt; vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eHydrogen-alpha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eOxygen III\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: nowrap; vertical-align: bottom; border-right: 1px solid #000000;\"\u003e\u003cspan style=\"vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border-right: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2.5nm +0.3\/-0.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2.5nm +0.3\/-0.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2.5nm +0.3\/-0.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 51pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e656.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e500.7nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e95%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e95%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e93%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 143.1818181818182pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"1\" colspan=\"3\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD5\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 143.1818181818182pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"1\" colspan=\"3\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSelected Filters\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"H-alpha \/ 2\"","offer_id":44108918751461,"sku":"AF-HA-ULTRA25-2","price":837.0,"currency_code":"CAD","in_stock":true},{"title":"H-alpha \/ 36mm","offer_id":46326660071653,"sku":"AF-HA-ULTRA25-36","price":660.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur-II \/ 2\"","offer_id":44108918784229,"sku":"AF-SII-ULTRA25-2","price":837.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur-II \/ 36mm","offer_id":46326660104421,"sku":"AF-SII-ULTRA25-36","price":660.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 2\"","offer_id":44108918816997,"sku":"AF-OIII-ULTRA25-2","price":837.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 36mm","offer_id":46326660137189,"sku":"AF-OIII-ULTRA25-36","price":660.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set \/ 2\"","offer_id":44108918882533,"sku":"AF-SHO-ULTRA25-2","price":2511.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set \/ 36mm","offer_id":46326660169957,"sku":"AF-SHO-ULTRA25-36","price":1980.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-2-5nm-sho-ultra-narrowband-filters-2-mounted-astronomy-plus.webp?v=1690491120"},{"product_id":"antlia-lrgbr-dark-series-filters","title":"Antlia LRGBR+ Dark series filters","description":"\u003ch1\u003eAntlia LRGBR+ Dark series filters\u003c\/h1\u003e\n\u003cp\u003eThe Antlia LRGBR+ Dark series filters are designed with a full spectrum curve from 390nm to 1000nm, making it sensitive to both UV and IR light for high signal-to-noise ratio and contrast imaging in deep sky full-spectrum photography.\u003cbr\u003e\u003cbr\u003eThe LRGB dark series filters are made of quartz glass, which has exceptional thermal and mechanical properties due to its ultra-low thermal expansion coefficient. These filters offer remarkable durability for imaging and research in the most challenging environmental conditions.\u003cbr\u003e\u003cbr\u003eConsidering the high quantum efficiency (QE) of the cameras in the near-infrared bands, Antlia incorporates a Red+700-1000nm filter into LRGB dark series to capture valuable signals that cannot be detected by regular LRGB filters.\u003cbr\u003e\u003cbr\u003eIn post-processing, combine the R and R+ channels to create a new R channel. The remaining steps for processing are identical to those used as regular LRGB filters.\u003cbr\u003e\u003cbr\u003eThe LRGBR+ Dark series filters are best paired with Antlia SHO 2.8nm and 2.5nm Ultra Narrowband filters, as they share the same quartz substrate and refractive index, resulting in better parfocality.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe main features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e-Full spectrum design enhances the sensitivity of imaging to both UV and IR light.\u003c\/li\u003e\n\u003cli\u003e High transmittance B filter≥95%，L-R-G filter≥97%，this ensures that there is almost no loss in image signal, maximizing contrast;\u003c\/li\u003e\n\u003cli\u003eMade of quartz glass, excellent durability and thermal stability, as well as better fracture and scratch resistance, improved coating resilience to cleaning;\u003c\/li\u003e\n\u003cli\u003e More infrared signal to be found by combining Red+ filter;\u003c\/li\u003e\n\u003cli\u003eOut of band blocking specification is designed to OD4.5 (0.005%) to block interference from other wavelengths and minimize halos around bright stars;\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards and double-sided fine polishing , with utmost care for parfocality\u003c\/li\u003e\n\u003cli\u003eAll Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light；\u003c\/li\u003e\n\u003cli\u003eFilters are resistant to scratches；\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 16px;\"\u003e\u003cstrong\u003eSpectrum Curves:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; line-height: 21px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"图片1.png\" src=\"http:\/\/20564242.s21i.faiusr.com\/4\/2\/ABUIABAEGAAgyu_1owYo3tmy9AYwlBE4qgk.png\" width=\"2196\" height=\"1194\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse; font-family: Calibri; font-size: 11pt; color: rgb(0, 0, 0); background-color: transparent; width: 102.857%; height: 264.625px;\" 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AIgAAAFQAYQBiAGwAZQBTAHQAeQBsAGUATQBlAGQAaQB1AG0AMgABIgAAAFAAaQB2AG8AdABTAHQAeQBsAGUATABpAGcAaAB0ADEANgARNwAAAAAyAAAA+gARAAAAUwBsAGkAYwBlAHIAUwB0AHkAbABlAEwAaQBnAGgAdAAxAPsABAAAAAAAAAAIAAAAAA==\" cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 20.1562px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: nowrap; text-align: left; vertical-align: top; border-right: 1px solid rgb(0, 0, 0); border-left: 1px solid rgb(0, 0, 0); border-top: 1px solid rgb(0, 0, 0); height: 20.1562px;\"\u003e\u003cspan style=\"font-family: Times New Roman; font-size: 10pt; vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 40.3124px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eLuminance UV\/IR Cut filter\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 40.3124px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"color: #141617; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eRed filter\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 40.3124px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"color: #141617; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eGreen filter\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 40.3124px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"color: #141617; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eBlue filter\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 40.3124px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"color: #141617; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eRed+ filter\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20.1562px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: nowrap; vertical-align: bottom; border-right: 1px solid rgb(0, 0, 0); height: 20.1562px;\"\u003e\u003cspan style=\"vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 50px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: normal; text-align: center; vertical-align: top; border-right: 1px solid rgb(0, 0, 0); border-bottom: 1px solid rgb(0, 0, 0); border-left: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eTransmission Range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e390nm-710nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e595-705nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e495-600nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e400-505nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e700-1000nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 50px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e97%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e97%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e97%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e95%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e95%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 33px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 33px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eSubstrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 33px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003equartz glass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 33px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003equartz glass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 33px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003equartz glass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 33px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003equartz glass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 33px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eHWB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 41.3125px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 41.3125px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 41.3125px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD4.5 (0.005%)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 41.3125px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD4.5 (0.005%)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 41.3125px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD4.5 (0.005%)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 41.3125px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD4.5 (0.005%)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 41.3125px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD4.5 (0.005%)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 50px;\"\u003e\n\u003ctd style=\"width: 15.1185%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 17.0301%; white-space: normal; text-align: center; vertical-align: top; border: 1px solid rgb(0, 0, 0); height: 50px;\"\u003e\u003cspan style=\"color: #666666; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSelected Filters\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"36mm \/ Red+","offer_id":44110436663525,"sku":"AF-LRGBR+-36-R+","price":85.0,"currency_code":"CAD","in_stock":true},{"title":"36mm \/ LRGBR+ Dark series set","offer_id":44110436696293,"sku":"AF-LRGBR+-36-LRGBR+","price":710.0,"currency_code":"CAD","in_stock":true},{"title":"36mm \/ LRGB Dark series set","offer_id":44110436729061,"sku":"AF-LRGBR+-36-LRGB","price":639.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ Red+","offer_id":44110436892901,"sku":"AF-LRGBR+-2-R+","price":127.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ LRGBR+ Dark series set","offer_id":44110436925669,"sku":"AF-LRGBR+-2-LRGBR+","price":966.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ LRGB Dark series set","offer_id":44110436958437,"sku":"AF-LRGBR+-2-LRGB","price":852.0,"currency_code":"CAD","in_stock":true},{"title":"50mm \/ LRGB Dark series set","offer_id":46768605036773,"sku":"AF-LRGB-DS-50","price":1065.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-lrgbr-dark-series-filters-astronomy-plus-1.webp?v=1690491120"},{"product_id":"antlia-sho-3nm-narrowband-pro-highspeed-filters","title":"Antlia SHO 3nm Narrowband PRO Highspeed Filters","description":"\u003ch1\u003eAntlia SHO 3nm Narrowband PRO Highspeed Filters\u003c\/h1\u003e\n\u003cp\u003eAntlia's SHO 3nm Pro Highspeed Filters are further optimized for high-speed imaging systems by pre-shifting the center wavelength. This specially-optimized version will provide significantly SNR(Signal to Noise Ratio) for the fast telescopes with focal ratio between f\/2.6 and f\/3.6 than the standard 3nm Pro version.\u003cbr\u003e\u003cbr\u003eThe optical light path of a telescope is cone-shaped, which creates an angle, and the center wavelength of the interference filter will shift toward shorter (blue) wavelengths as the angle of incidence((AOI) increases; the greater the angle， the greater the shift. The amount of beam deviation depends on the refractive index and the thickness of the substrate. The blue shift data by the simulation indicates that at a focal ratio of f\/2.6, the angle of incidence of the light cone is 10°and its bandwidth shift 2.2nm to shorter wavelengths. Therefore, the Highspeed 3nm Pro narrowband filters are designed to be pre-shifted by 1.2nm towards the longer (red) end in order to compensate for the Blueshift and ensure high signal acquisition by telescopes with fast focal ratios.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications \u003cbr\u003e\n\u003c\/h3\u003e\n\u003ctable data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; clear: both; border-collapse: collapse; word-break: break-all; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\" width=\"667\" cellspacing=\"0\" border=\"0\"\u003e\n\u003ctbody data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border: 1px solid #a7a7a7;\" valign=\"center\" width=\"216\"\u003e\u003cbr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: 1px solid #a7a7a7; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"151\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eHydrogen-alpha\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: 1px solid #a7a7a7; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eOxygen III\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: 1px solid #a7a7a7; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: 1px solid #a7a7a7; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"216\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eFWHM\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"151\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: 1px solid #a7a7a7; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"216\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"151\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e65\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e7\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e.5nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e50\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e1.9\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e673.6nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: 1px solid #a7a7a7; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"216\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"151\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e90%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e90%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"150\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #0000ff; font-size: 13px;\"\u003e90%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: 1px solid #a7a7a7; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"216\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eBlocking\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" colspan=\"3\" valign=\"center\" width=\"451\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e≥OD5 @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\" style=\"text-size-adjust: 100%;\"\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: 1px solid #a7a7a7; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" valign=\"center\" width=\"216\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; padding: 1px; border-left: none; border-right: 1px solid #a7a7a7; border-top: none; border-bottom: 1px solid #a7a7a7;\" colspan=\"3\" valign=\"center\" width=\"451\"\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px; text-align: center;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial; color: #000000; font-size: 13px;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px 0px 1px; line-height: 21px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e2mm+\/-0.05mm for 1.25\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: 微软雅黑;\"\u003e”\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e, 2\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: 微软雅黑;\"\u003e”\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-family: Arial;\"\u003emounted, Dia31mm and Dia36mm unmounted\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; margin: 0px 0px 1px; line-height: 21px;\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3mm+\/-0.05mm for Dia50mm and square 50x50mm unmounted\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eAntlia SHO 3nm Narrowband PRO Highspeed Filters:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e36mm\u003c\/li\u003e\n\u003cli\u003e2\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"1.25\" \/ SHO Set","offer_id":45819412152549,"sku":"AF-SHO-PRO-HS-125","price":1140.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" \/ H-Alpha","offer_id":45819412185317,"sku":"AF-Ha-PRO-HS-125","price":380.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" \/ OIII","offer_id":45819412218085,"sku":"AF-OIII-PRO-HS-125","price":380.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" \/ Sulfur II","offer_id":45819412250853,"sku":"AF-SII-PRO-HS-125","price":380.0,"currency_code":"CAD","in_stock":true},{"title":"31mm \/ SHO Set","offer_id":45819412283621,"sku":"AF-SHO-PRO-HS-31","price":1227.0,"currency_code":"CAD","in_stock":true},{"title":"31mm \/ H-Alpha","offer_id":45819412316389,"sku":"AF-Ha-PRO-HS-31","price":409.0,"currency_code":"CAD","in_stock":true},{"title":"31mm \/ OIII","offer_id":45819412349157,"sku":"AF-OIII-PRO-HS-31","price":409.0,"currency_code":"CAD","in_stock":true},{"title":"31mm \/ Sulfur II","offer_id":45819412381925,"sku":"AF-SII-PRO-HS-36","price":409.0,"currency_code":"CAD","in_stock":true},{"title":"36mm \/ SHO Set","offer_id":44197801165029,"sku":"AF-SHO-PRO-HS-36","price":1383.0,"currency_code":"CAD","in_stock":true},{"title":"36mm \/ H-Alpha","offer_id":44548677370085,"sku":"AF-Ha-PRO-HS-36","price":461.0,"currency_code":"CAD","in_stock":true},{"title":"36mm \/ OIII","offer_id":44548677402853,"sku":"AF-OIII-PRO-HS-36","price":461.0,"currency_code":"CAD","in_stock":true},{"title":"36mm \/ Sulfur II","offer_id":44548677435621,"sku":"AF-SII-PRO-HS-36","price":461.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ SHO Set","offer_id":44197801197797,"sku":"AF-SHO-PRO-HS-2","price":1788.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ H-Alpha","offer_id":44548677468389,"sku":"AF-Ha-PRO-HS-2","price":596.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ OIII","offer_id":44548677501157,"sku":"AF-OIII-PRO-HS-2","price":596.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ Sulfur II","offer_id":44548677533925,"sku":"AF-SII-PRO-HS-2","price":596.0,"currency_code":"CAD","in_stock":true},{"title":"50mm \/ SHO Set","offer_id":45819412414693,"sku":"AF-SHO-PRO-HS-50","price":2193.0,"currency_code":"CAD","in_stock":true},{"title":"50mm \/ H-Alpha","offer_id":45819412447461,"sku":"AF-Ha-PRO-HS-50","price":731.0,"currency_code":"CAD","in_stock":true},{"title":"50mm \/ OIII","offer_id":45819412480229,"sku":"AF-OIII-PRO-HS-50","price":731.0,"currency_code":"CAD","in_stock":true},{"title":"50mm \/ Sulfur II","offer_id":45819412512997,"sku":"AF-SII-PRO-HS-50","price":731.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/products\/antlia-sho-3nm-narrowband-pro-highspeed-filters-astronomy-plus-1.webp?v=1715808838"},{"product_id":"antlia-quad-band-anti-light-pollution-filter-2-mounted","title":"Antlia Quad Band Anti-Light Pollution Filter 2\" Mounted (QUAD-2)","description":"\u003ch1\u003eAntlia Quad Band Anti-Light Pollution Filter 2\" Mounted\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Quad Band Anti-Light Pollution Filter is a light suppression filter for color and monochrome cameras. It is able to shoot most deep sky objects like galaxies, reflection nebulae, emission nebula, and star clusters from a Bortle 8 location to Bortle 1 as its spectral transmission passes through visible light region, near-ultraviolet (NUV) and near-infrared (NIR) region. Antlia Quad Band filter has a broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/p\u003e\n\u003cp\u003eConsidering the high quantum efficiency (QE) characteristics of the latest cameras in the near-infrared region and this region is less susceptible to artificial light pollution, the Antlia Quad Band Light-Pollution Filter add shigh transmission in the near-infrared (NIR) band. This spectrum design improves image signal-to-noise ratio and contrast by capturing signals in visible bands and NIR region, while also maintaining good color balance and being easier to manage in post-processing. \u003c\/p\u003e\n\u003cp\u003eCertain full-spectrum objects like M51, M83 possess significant signal in the near-infrared (NIR) region, you can possibly capture these deep sky objects more contrasted with the Antlia Quad Band filter under light polluted condition. When using this filter with a camera that has UV\/IR cut protective glass, the visible band transmission signal is retained, but the IR cut limits your ability to capture targets with infrared signal. Therefore, the Antlia Quad Band filter is more suitable for cameras with AR protective glass as they cancapture both NIR and visible band signals.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe main features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnti-Light Pollution\u003cbr\u003eThe Antlia Quad Band filter is an effective solution for reducing light pollution, as it cuts out most of theorange-yellow lights from 589nm and part of blue lights from LEDs\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePossible to shoot over 95% of deep sky objects\u003c\/li\u003e\n\u003cli\u003eUnique spectral design offers more possibilities for astrophotography\u003c\/li\u003e\n\u003cli\u003eHigh transmittance of the main emission lines Ha\/SII\/OIII\/H-Beta in the visible region, enhances the astrophotography's high SNR and contrast;\u003c\/li\u003e\n\u003cli\u003eNear-infrared (NIR) region transmittance\u003c\/li\u003e\n\u003cli\u003ePassing near infrared region is for shooting deep sky objects that cannot be shot with other filters without NIR transmission\u003c\/li\u003e\n\u003cli\u003eThe broad bandpass designed to cope with faster optics up to the f\/2 focal ratio. - Good color balance\u003c\/li\u003e\n\u003cli\u003eIt is easier to achieve color balance by adding the short-wavelength transmission\u003c\/li\u003e\n\u003cli\u003eSuperior optical reliability reduces post image processing\u003c\/li\u003e\n\u003cli\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront: Lambda\/4 or better. - Parallelism: less than 30 arcsec\u003c\/li\u003e\n\u003cli\u003eWarranty: 3-years against delamination\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFilter Ring:\u003c\/h2\u003e\n\u003cp\u003eAntlia standard ring:1.25’’ (M28.5*0.6)，2’’(M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eNot Recommended:\u003c\/h2\u003e\n\u003cp\u003eSolar imaging\u003cbr\u003eNight visual observation\u003c\/p\u003e\n\u003ch2\u003eNot Permitted:\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" 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style=\"border-collapse: collapse; font-family: Calibri; font-size: 11pt; color: rgb(0, 0, 0); background-color: transparent; width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: nowrap; text-align: left; vertical-align: bottom; border-bottom: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; font-weight: bold; vertical-align: baseline;\"\u003eSpectrum Specifications:\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 30pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: left; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt; font-weight: bold; vertical-align: baseline;\"\u003eH-alpha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eS-II\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eO-III\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eH-beta\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eNII\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd colspan=\"1\" rowspan=\"2\" style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eWavelength\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"2\" style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e656.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e671.6nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e495.9nm,\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"2\" style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e658.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e673.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e500.7nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e654.8nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"5\" rowspan=\"1\" style=\"width: 71.0572%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e≥OD4@ 300-1050nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"5\" rowspan=\"1\" style=\"width: 71.0572%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: nowrap; text-align: left; vertical-align: bottom; border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2025_Quad_Band_filter_spectrum_curve.jpg?v=1737230060\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eAntlia Quad Band Anti-Light Pollution Filter 2\" Mounted\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":44272880877797,"sku":"AF-QUAD-2","price":281.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-quad-band-anti-light-pollution-filter-2-mounted-quad-2-astronomy-plus.webp?v=1715808614"},{"product_id":"antlia-2-filter-holder","title":"Antlia 2\" Filter Slider for OAG and Drawer (OAG-B-M48)","description":"\u003ch2\u003eAntlia 2\" Filter Slider for OAG and Drawer\u003c\/h2\u003e\n\u003cp\u003eThis is an extra 2\" mounted filter slider to be used with the Antlia OAG and Filter Drawer Assembly. Holds standard 2\" mounted filters with 48mm threads.\u003c\/p\u003e\n\u003cp\u003eFor use of a mounted 1.25\", you can use a Starizona\u003ca href=\"https:\/\/astronomyplus.com\/products\/starizona-filter-slider-2-to-1-25-filter-adapter-sfs-2125a\"\u003e 2\" to 1.25\" adapter.\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup span=\"2\" width=\"85\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"18\" align=\"left\" valign=\"bottom\"\u003e\u003cspan style=\"color: #000000;\"\u003eThread\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"bottom\"\u003e\u003cspan style=\"color: #000000;\"\u003eM48 x 0.75\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"18\" align=\"left\" valign=\"bottom\"\u003e\u003cspan style=\"color: #000000;\"\u003eWeight in Kg\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"bottom\" sdval=\"0.15\" sdnum=\"4105;\"\u003e\u003cspan style=\"color: #000000;\"\u003e0.15\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eIn the Box \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 2\" Filter slider\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45584805724389,"sku":"AF-OAG-B-M48","price":43.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_f3b5bde1-7078-4ece-80ee-347218b2ca2d.png?v=1777044821"},{"product_id":"antlia-triband-rgb-ii-ultra-filter-rgb-ii","title":"Antlia Triband RGB II Ultra Filter (RGB-II)","description":"\u003ch1\u003e\n\u003cspan\u003eAntlia Triband RGB II Ultra Filter\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia Triband RGB Ultra Filter II adds the H-Beta 486.1nm line to the Triband RGB Ultra, enhancing its ability to capture finer details of nebulae. It is designed for light pollution suppression for OSC and Mono cameras. The spectral design selected the most substantial information in the RGB bands, which makes Antlia Triband RGB Ultra Filter II possible to shoot over 90% of deep sky objects, in addition to its excellent performance on emission nebula, different from other ultra-narrowband filters, it is able to capture galaxies, reflection nebulae, and star clusters from a Bortle 8 location to Bortle 1 while presenting more balanced RGB colors in your images. Also, it has a broad bandpass designed to cope with faster optics up to the f\/2 focal ratio\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eIt is workable to shoot galaxies, reflection nebulae and star clusters.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRefined coating process makes the Triband RGB Ultra filters II with excellent halo suppression and improved signal-to-noise performance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIt has been specifically designed for balanced color transmission using Antlia's experience in spectrum design.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe balanced transmission allows the minimal color cast to broadband emission objects such as stars, galaxies, and globular clusters.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe Triband RGB Ultra II can be used with nearly all systems as fast as f\/2 with minimal loss of efficiency or shifts in spectral response.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFor visual use, Triband RGB Ultra filter II ensures the high transmittance of the HSOHb emission lines and can be used for observing deep-sky objects with large-diameter telescopes.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe Triband RGB Ultra II is able to better isolate the H-alpha, O3 and blue spectrum from the background light pollution.\u003cbr\u003eThe filter provides excellent flexibility and compatibility with both OSC and Mono camera systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIt facilitates the imaging of most astronomical objects using all optical configurations down to f\/2 focal ratio.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eWhen shooting LRGB with mono cameras, unless you are wanting to image LDN (dark nebulae) the \u003c\/span\u003e\u003cspan\u003eTriband RGB Ultra II can be used as a luminance filter replacement for objects such as nebulae and galaxies to improve contrast and signal to noise ratio\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSize Available: 2’’ mounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; font-family: Calibri; font-size: 11pt; color: rgb(0, 0, 0); background-color: transparent; width: 100%; height: 239.336px;\" 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cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 20.8398px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: nowrap; text-align: left; vertical-align: bottom; border-bottom: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; font-weight: bold; vertical-align: baseline;\"\u003eSpectrum Specifications:\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 20.8398px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 20.8398px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 20.8398px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 20.8398px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 20.8398px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.75px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: left; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 38.75px;\"\u003e\u003cspan style=\"vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 38.75px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt; font-weight: bold; vertical-align: baseline;\"\u003eH-alpha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 38.75px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eS-II\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 38.75px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eO-III\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 38.75px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eH-beta\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 38.75px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eNII\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20.8398px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 41.6796px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eWavelength\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 41.6796px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e656.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e671.6nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e495.9nm,\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 41.6796px;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e658.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20.8398px;\"\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e673.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e500.7nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e654.8nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 49.7461px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e92%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20.8398px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 20.8398px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 71.0572%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 20.8398px;\" rowspan=\"1\" colspan=\"5\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e≥OD4@ 300-1050nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 49.7461px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167); height: 49.7461px;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 71.0572%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167); height: 49.7461px;\" rowspan=\"1\" colspan=\"5\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 17.7344px;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: nowrap; text-align: left; vertical-align: bottom; border-top: 1px solid rgb(167, 167, 167); height: 17.7344px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 17.7344px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 17.7344px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 17.7344px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 17.7344px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; height: 17.7344px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2025_Triband_RGB_II_Filter_Spectrum_Curve.jpg?v=1737232345\" width=\"1071\" height=\"706\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFilter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFilter Case\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eManual \u0026amp; Warranty\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45731966615781,"sku":"AF-RGB-II","price":254.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgrf6BnAYorJj-lQUwsAk4sAk.jpg?v=1777043368"},{"product_id":"antlia-new-solar-discover-3nm-cak-sd-cak3","title":"Antlia NEW Solar Discover 3nm CaK filter (SD-CAK3)","description":"\u003ch2\u003eAntlia New Solar Discover 3nm CaK filter\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTelescope-side connection is 1.25\" and 2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eC\u003c\/span\u003eamera side connection is 2\" with ring clamp\u003c\/li\u003e\n\u003cli\u003eTransmission at 393.3 nm - FWHM is 3 nm\u003c\/li\u003e\n\u003cli\u003eMaximizes the contrast of sunspots, granulation and faculae on the solar surface\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eIdeally suited for combination with a Herschel prism\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eThe filter is not intended for visual observation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection\u003e\u003c\/section\u003e\n\u003cp\u003eThe Antlia Solar Discover 3nm CaK is an assembly consisting of one set of light reducing filters, designed to maximize imaging contrast of sun spots, solar surface granulation and other features that are prominent in CaK 393.3nm line.  \u003c\/p\u003e\n\u003cp\u003eAn Antlia 3nm Ultra narrow bandpass filter wavelength centered on Calcium II K-Line 393.3nm is built in. Its high blocking specification of OD5 (0.001%) intends to reduce most solar heat ingress.\u003c\/p\u003e\n\u003cp\u003eCompared to solar Herschel Wedge, the Antlia Solar Discover CaK 3nm assembly features a new tube structure design, 1.25’’ and 2’’ adapters are designed, as well as the addition of light-reducing filters. Installation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the another. The metal tube machined from aircraft aluminum CNN and oxidized. The filters are assembled in a fully closed tube. No stray light can escape from this.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"637\" width=\"955\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg257rrwYojenK9gMw6Ac4mwU.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- When you are using a zenith mirror, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.\u003c\/p\u003e\n\u003cp\u003e- When you are using a telescope with an aperture ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover 3nm CaK; If without the extra light reduction solution, the Solar Discover 3nm CaK can only used with REFRACTORS up to 100mm aperture.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbout Visual Observation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe bandpass of CaK (393.3 nm) is almost invisible to the human eyes, hence, the Antlia Solar Discover 3nm CaK assembly is primarily used for solar imaging and not recommended for visual observation due to the difficulty of many to visually see information that CaK has to offer.\u003c\/p\u003e\n\u003cp\u003eIn addition, the IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https:\/\/eclipse.aas.org\/eye-safety\/iso12312-2).\u003c\/p\u003e\n\u003cp\u003eFor tough technical requirements and safety considerations, we do not recommend Solar Discover 3nm CaK assembly for visual observation.If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety. Please contact Antlia if you have any questions.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"3nm CaK  photo sample.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg2p7rrwYopuGO5wMw6Ac46Ac.jpg\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"676\" cellspacing=\"0\" border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\" valign=\"center\" width=\"372\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eISO12312-2 Transmittance Requirements\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAntlia Transmittance Requirements\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e(\u003c\/span\u003e\u003cspan\u003eSolar Discover 5Å CaK\u003c\/span\u003e\u003cspan\u003e， Solar Discover 3nm CaK Assembly，\u003c\/span\u003e\u003cspan\u003eDualband Ha, CaK and CaH filter Assembly，ERF\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRequirements\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValue\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd rowspan=\"2\" valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd rowspan=\"2\" valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003eTmin%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003e0.000061%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%（UVB）\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%（UVA）\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%（IR）\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cspan\u003e3%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cspan\u003e780-2000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cspan\u003e780-1700nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg height=\"1434\" width=\"1434\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg2p7rrwYoqOq7ggYw3As43As.jpg\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eCaK filter system\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eProtective caps on both sides\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eCase\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003efor this item is not accepted once it has been disassembled.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45731993288933,"sku":"AF-SD-CAK3","price":400.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_4e54fae9-ba71-48e2-983f-3518ba32bea5.jpg?v=1777043370"},{"product_id":"antlia-new-solar-discover-5a-cak-filter-sd-cak5","title":"Antlia Solar Discover 5Å CaK filter (SD-CAK5)","description":"\u003ch1\u003eAntlia Solar Discover 5Å CaK filter (SD-CAK5)\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Solar Discover 5Å CaK assembly incorporates a set of light-reducing filters to reduce solar heat ingress for safe operation during solar imaging. It is specifically engineered to enhance imaging contrast for Plages, Light Bridges, features prominent in the CaK 393.3nm line and sunspots.\u003c\/p\u003e\n\u003cp\u003eThe Antlia 5Å Ultra Narrow Bandpass Filter is built in, it features a clear aperture of D12mm (B1200) and a wavelength centered on the Calcium II K-Line at 393.3nm. With its ultra-narrow full width at half maximum (FWHM) of 0.5nm, it enables the capture of details in the Chromosphere.\u003c\/p\u003e\n\u003cp\u003eInstallation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eattached at one end and the camera at the another. The metal tube machined from aircraft aluminum CNN and oxidized. The filters are assembled within a fully enclosed tube, preventing stray light into it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant Notes\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e- If you do not use the Barlow lens, your telescope must has a focal ratio ＞7.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e- Optional 2X,3X and 5X Barlow lenses are available, Antlia specifically designed for Solar Discover 5Å CaK ; please order them separately if required. Please refer to the installation diagram and an installation video can be supplied for your reference.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e- Optional 50mm and 70mm extension tube are provided by Antlia for better focus. please order them separately if required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e-When you are using a zenith mirror, or Barlow lens supplied by other manufacturer, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eWhen you are using a telescope with an aperture ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover 5Å CaK; If without the extra light reduction solution, the Solar Discover 5Å CaK can only used with REFRACTORS up to 100mm aperture.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAg3tbqrwYomtjW6wUwmQ84kAo.jpg?v=1718464644\" width=\"1248\" height=\"832\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAbout Visual Observation\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe bandpass of CaK (393.3 nm) is almost invisible to the human eyes, hence, the Antlia Solar Discover 5Å CaK assembly is primarily used for solar imaging and not recommended for visual observation due to the difficulty of many to visually see information that CaK has to offer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn addition, the IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https:\/\/eclipse.aas.org\/eye-safety\/iso12312-2)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor tough technical requirements and safety considerations, we do not recommend Solar Discover 5Å CaK assembly for visual observation.If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAg89PqrwYowIGy_wcw8Qs4iQo.jpg?v=1718480729\" width=\"1277\" height=\"1082\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" width=\"676\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"372\" valign=\"center\" colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eISO12312-2 Transmittance Requirements\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAntlia Transmittance Requirements\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e(\u003c\/span\u003e\u003cspan\u003eSolar Discover 5Å CaK\u003c\/span\u003e\u003cspan\u003e， Solar Discover 3nm CaK Assembly，\u003c\/span\u003e\u003cspan\u003eDualband Ha, CaK and CaH filter Assembly，ERF\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRequirements\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValue\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\" rowspan=\"2\"\u003e\n\u003cp\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\" rowspan=\"2\"\u003e\n\u003cp\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eTmin%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e0.000061%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%（UVB）\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%（UVA）\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eTmax%（IR）\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e3%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e780-2000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e780-1700nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eIn the Box\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCaK filter system\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eProtective caps on both sides\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e \u003c\/span\u003eCase\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWarranty \u0026amp; Manual\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003efor this item is not accepted once it has been disassembled.\u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45735640957157,"sku":"AF-SD-CAK5","price":1080.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgjJzXrwYo7IO22wQwuAg4uAg.jpg?v=1777043370"},{"product_id":"antlia-barlow-for-5a-cak-solar-discover","title":"Antlia Barlow for 5Å CaK Solar Discover","description":"\u003ch2\u003eAntlia Barlow for 5Å CaK Solar Discover\u003c\/h2\u003e\n\u003cdiv class=\"ast-product-hero-info__short-desc\"\u003e\u003cspan class=\"metafield-multi_line_text_field\"\u003eThe discover form factor offers a compelling and flexible alternative to the Wedge. Here we have the ability to mount cameras straight on without the need for a right angle.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"ast-product-hero-info__highlights\"\u003e\n\u003cdiv class=\"metafield-rich_text_field\"\u003e\n\u003cul\u003e\n\u003cli\u003eIf you do not use the Barlow lens, your telescope must has a focal ratio ＞7.\u003c\/li\u003e\n\u003cli\u003eOptional 2X,3X and 5X Barlow lenses are available, Antlia specifically designed for Solar Discover 5Å CaK ; please order them separately if required. Please refer to the installation diagram and an installation video can be supplied for your reference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eAntlia Barlow for 5Å CaK Solar Discover, at selected magnification :\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2x Barlow\u003c\/li\u003e\n\u003cli\u003e3x Barlow\u003c\/li\u003e\n\u003cli\u003e5x Barlow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003efor this item is not accepted once it has been disassembled.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"2x Barlow","offer_id":45735685062885,"sku":"ANT-CAK-BAR2","price":71.0,"currency_code":"CAD","in_stock":true},{"title":"3x Barlow","offer_id":45735685095653,"sku":"ANT-CAK-BAR3","price":55.0,"currency_code":"CAD","in_stock":true},{"title":"5x Barlow","offer_id":45735685128421,"sku":"ANT-CAK-BAR5","price":60.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5x-001.jpg?v=1777043371"},{"product_id":"antlia-new-solar-discover-dualband-ha-cak-and-cah-standard","title":"Antlia Solar Discover Dualband（Ha, CaK and CaH) - Standard (SD-DUAL-STD)","description":"\u003ch1\u003eAntlia Solar Discover Dualband（Ha, CaK and CaH) - Standard\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Solar Discover Dualband (Ha, CaK, and CaH) filter assembly comes in both standard and mini versions. It is specifically designed for solar photosphere photography, effectively enhancing contrast and sharpness in solar imaging. This results in greater visibility of surface details and highlights of sunspots, while also providing higher contrast for solar faculae.\u003c\/p\u003e\n\u003cp\u003eThe complete assembly comes with a Antlia Energy Rejection Filter (ERF) filter, functions to block UV and IR light, which allows the desired wavelengths Ha 656.3nm, CaK 393.3nm, and CaH 396.8nm to pass through.\u003c\/p\u003e\n\u003cp\u003eIn addition, necessary ND filter is already manufacture installed in the tube.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- New tube structure design is used for the Antlia Solar Discover Dualband filter assembly，installation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the another. The filters are assembled in a fully closed tube and the metal tube machined from aircraft aluminum CNN and oxidized. No stray light can escape from this.\u003c\/p\u003e\n\u003cp\u003e- Compared to other solar reducing films, the Antlia Solar Discover Dualband filter assembly offers superior advantages: it enables higher contrast for solar imaging, higher resolution of the solar surface, and the design less susceptible to wear and tear. Additionally, it's user-friendly, ensuring ease of use, and boasts an extended lifespan for your equipments used for solar imaging.\u003c\/p\u003e\n\u003cp\u003e- It can be directly used for solar Photosphere imaging, such as sunspots.\u003c\/p\u003e\n\u003cp\u003e- 1.25\" and 2\" Adapters\u003c\/p\u003e\n\u003cp\u003eThe Antlia Solar Discover Dualband Ha, CaK and CaH filter assembly combines the 1.25'' and 2'' adapter used in astrophotography for easier and faster connection of telescopes and cameras. The standard version is compatible with both 1.25'' and 2'' adapters, while the mini version is designed with 1.25'' adapter.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Installation Diagram:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg alt=\"Installation Diagram.jpg\" height=\"667\" width=\"1000\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgp6PrrwYopv_H7QEw6Ac4mwU.jpg\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant Notes:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e- \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eWhen you are using a zenith mirror, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e- When you are using a telescope with an aperture ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover Dualband Ha, CaK and CaH filter Assembly; If without the extra light reduction solution, the Solar Discover Discover Dualband Assembly can only used with REFRACTORS up to 100mm aperture.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbout Visual Observation \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https:\/\/eclipse.aas.org\/eye-safety\/iso12312-2).\u003c\/p\u003e\n\u003cp\u003eFor tough technical requirements and safety considerations, we do not recommend Solar Discover Dualband Ha, CaK and CaH filter assembly for visual observation. If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety.\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"jz-image-viewer__img urst-none wh-auto ht-auto\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgjanrrwYo26bxMTDiCjjyBQ.jpg\" alt=\"\" data-v-4f7c66ef=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cimg class=\"jz-image-viewer__img urst-none wh-auto ht-auto\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgqKPrrwYoq4TYqQYw6Ac46Ac.jpg\" alt=\"\" data-v-4f7c66ef=\"\"\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eTechnical  Specification\u003c\/h3\u003e\n\u003ctable width=\"676\" cellspacing=\"0\" border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\" valign=\"center\" width=\"372\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eISO12312-2 Transmittance Requirements\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAntlia Transmittance Requirements\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e(\u003c\/span\u003e\u003cspan\u003eSolar Discover 5Å CaK\u003c\/span\u003e\u003cspan\u003e， Solar Discover 3nm CaK Assembly，\u003c\/span\u003e\u003cspan\u003eDualband Ha, CaK and CaH filter Assembly，ERF\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRequirements\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValue\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd rowspan=\"2\" valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd rowspan=\"2\" valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmin%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.000061%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%（UVB）\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%（UVA）\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%（IR）\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e3%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e780-2000nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e780-1700nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSolar Discover Dualband（Ha, CaK and CaH) - Standard\u003c\/p\u003e\n\u003cp\u003e1,25\" and 2\" adapter\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia 3-years\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange\u003c\/p\u003e\n\u003cp\u003efor this item is not accepted once it has been disassembled.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45745300865253,"sku":"AF-SD-DUAL-STD","price":170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgwaPrrwYosaic1wcw6Ac46Ac.jpg?v=1777043371"},{"product_id":"antlia-new-solar-discover-dualband-ha-cak-and-cah-mini-sd-dual-mini","title":"Antlia Solar Discover Dualband（Ha, CaK and CaH) - Mini (SD-DUAL-MINI)","description":"\u003ch1\u003eAntlia Solar Discover Dualband（Ha, CaK and CaH) - Mini\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Solar Discover Dualband (Ha, CaK, and CaH) filter assembly comes in both standard and mini versions. It is specifically designed for solar photosphere photography, effectively enhancing contrast and sharpness in solar imaging. This results in greater visibility of surface details and highlights of sunspots, while also providing higher contrast for solar faculae.\u003c\/p\u003e\n\u003cp\u003eThe complete assembly comes with a Antlia Energy Rejection Filter (ERF) filter, functions to block UV and IR light, which allows the desired wavelengths Ha 656.3nm, CaK 393.3nm, and CaH 396.8nm to pass through.\u003c\/p\u003e\n\u003cp\u003eIn addition, necessary ND filter is already manufacture installed in the tube.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- New tube structure design is used for the Antlia Solar Discover Dualband filter assembly，installation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the another. The filters are assembled in a fully closed tube and the metal tube machined from aircraft aluminum CNN and oxidized. No stray light can escape from this.\u003c\/p\u003e\n\u003cp\u003e- Compared to other solar reducing films, the Antlia Solar Discover Dualband filter assembly offers superior advantages: it enables higher contrast for solar imaging, higher resolution of the solar surface, and the design less susceptible to wear and tear. Additionally, it's user-friendly, ensuring ease of use, and boasts an extended lifespan for your equipments used for solar imaging.\u003c\/p\u003e\n\u003cp\u003e- It can be directly used for solar Photosphere imaging, such as sunspots.\u003c\/p\u003e\n\u003cp\u003e- 1.25\" and 2\" Adapters\u003c\/p\u003e\n\u003cp\u003eThe Antlia Solar Discover Dualband Ha, CaK and CaH filter assembly combines the 1.25'' and 2'' adapter used in astrophotography for easier and faster connection of telescopes and cameras. The standard version is compatible with both 1.25'' and 2'' adapters, while the mini version is designed with 1.25'' adapter.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Installation Diagram:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgp6PrrwYopv_H7QEw6Ac4mwU.jpg\" width=\"1000\" height=\"667\" alt=\"Installation Diagram.jpg\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant Notes:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e- \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eWhen you are using a zenith mirror, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e- When you are using a telescope with an aperture ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover Dualband Ha, CaK and CaH filter Assembly; If without the extra light reduction solution, the Solar Discover Discover Dualband Assembly can only used with REFRACTORS up to 100mm aperture.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDue to different batches, the mini version will have 2 appearances, the function and installation are the same.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbout Visual Observation \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https:\/\/eclipse.aas.org\/eye-safety\/iso12312-2).\u003c\/p\u003e\n\u003cp\u003eFor tough technical requirements and safety considerations, we do not recommend Solar Discover Dualband Ha, CaK and CaH filter assembly for visual observation. If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety.\u003c\/p\u003e\n\u003cp\u003ePlease contact Antlia if you have any question.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgjanrrwYo26bxMTDiCjjyBQ.jpg\" width=\"1378\" height=\"754\" alt=\"Antlia Solar Discover Dualband (1).jpg\" class=\"need_fix\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" width=\"676\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"372\" valign=\"center\" colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eISO12312-2 Transmittance Requirements\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAntlia Transmittance Requirements\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e(\u003c\/span\u003e\u003cspan\u003eSolar Discover 5Å CaK\u003c\/span\u003e\u003cspan\u003e， Solar Discover 3nm CaK Assembly，\u003c\/span\u003e\u003cspan\u003eDualband Ha, CaK and CaH filter Assembly，ERF\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRequirements\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValue\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWavelength Range\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\" rowspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\" rowspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e380-780nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmin%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.000061%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%（UVB）\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e280-315nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%（UVA）\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e0.0032%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e315-380nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTmax%（IR）\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"116\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e3%\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"141\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e780-2000nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"303\" valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e780-1700nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSolar Discover Dualband（Ha, CaK and CaH) - Mini (SD-DUAL-MINI)\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia 3-years\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange\u003c\/p\u003e\n\u003cp\u003efor this item is not accepted once it has been disassembled.\u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45745366401253,"sku":"AF-SD-DUAL-MINI","price":120.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgtaPrrwYo1rqerAEw6Ac46Ac.jpg?v=1777043371"},{"product_id":"antlia-new-solar-discover-dualband-energy-rejection-filter-erf","title":"Antlia Solar Discover Dualband Energy Rejection Filter (ERF)","description":"\u003ch1\u003eAntlia Solar Discover Dualband Energy Rejection Filter (ERF)\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Dualband Solar Energy Rejection Filter is designed by combining Hydrogen Alpha, Calcium K-Line and Calcium H-Line in one dualband filter. It is the filter used in conjunction with Antlia Solar Discover 3nm CaK, Solar, 5Å CaK or similar product to protect your solar imaging equipments from high temperature and bandpass shifting by rejecting massive heat before it enters telescope when imaging and observing solar.\u003c\/p\u003e\n\u003cp\u003eThey are very effective at blocking UV and IR light, and allow the desired wavelengths Ha 656.3nm, CaK 393.3nm and CaH 396.8nm to pass through.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Features: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- FWHM 25nm with CWL at H-alpha wavelength of 656.3nm; Transmission: T＞95%\u003c\/p\u003e\n\u003cp\u003e- FHWM 25nm with CWL at CaK wavelength 393.3nm covering Calcium K-Line 393.3nm and Calcium K-Line 396.8nm; Transmission: T＞90%\u003c\/p\u003e\n\u003cp\u003e- Coating Range: 200-1700nm wavelengths\u003c\/p\u003e\n\u003cp\u003e- Finished with the most advanced multicoatings\u003c\/p\u003e\n\u003cp\u003e- Coated on heat resistant double-polished substrate\u003c\/p\u003e\n\u003cp\u003e- Antlia ERF 130mm, 150mm，200mm filters are mounted in a housing\/cell to hold it in front of the telescope\u003c\/p\u003e\n\u003cp\u003e- Antlia ERF 2’’ mounted filter is installed on the back end of the refractor telescope\u003c\/p\u003e\n\u003cp\u003e- Transmitted Wavefront: Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/4\/2\/ABUIABAEGAAgurvrrwYov732ZzCPCjjgBQ.png\" width=\"1133\" height=\"644\" alt=\"Antlia dualband ERF spectrum.JPG\" class=\"need_fix\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Notes: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- The Antlia Dual ERF filters cannot be used on its own. It must be used together with the professionally made solar imaging equipments, which have their own complete blocking filters assembled. Such as Antlia Solar Discover 5Å CaK, Solar Discover 3nm CaK Assembly, Dualband Ha, CaK and CaH filter Assembly;\u003c\/p\u003e\n\u003cp\u003e- Please do not use the Antlia Dualband ERF filter by itself for visual observation;\u003c\/p\u003e\n\u003cp\u003e- 2’’ ERF filter must working on 110mm or smaller refractors.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"633\" cellspacing=\"0\" border=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eAntlia Dual ERF Filter\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"153\"\u003e\n\u003cp\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"309\"\u003e\n\u003cp\u003e\u003cspan\u003eCaK \u0026amp; CaH\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eFWHM\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"153\"\u003e\n\u003cp\u003e\u003cspan\u003e25nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"309\"\u003e\n\u003cp\u003e\u003cspan\u003e25nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"153\"\u003e\n\u003cp\u003e\u003cspan\u003eHa \u003cspan name=\"OLE_LINK3\"\u003e656.\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"309\"\u003e\n\u003cp\u003e\u003cspan\u003eCaK 393nm covering \u003c\/span\u003e\u003cspan\u003eCaK 393.3nm \u0026amp; CaH 396.8nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003ePeak Transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"153\"\u003e\n\u003cp\u003e\u003cspan\u003e9\u003c\/span\u003e\u003cspan\u003e0\u003c\/span\u003e\u003cspan\u003e%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"309\"\u003e\n\u003cp\u003e\u003cspan\u003e90%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eCoating Range\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" valign=\"center\" width=\"462\"\u003e\n\u003cp\u003e\u003cspan\u003e200-1700nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" valign=\"center\" width=\"462\"\u003e\n\u003cp\u003e\u003cspan\u003e10mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eSize\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" valign=\"center\" width=\"462\"\u003e\n\u003cp\u003e\u003cspan\u003eERF glass\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e130\u003c\/span\u003e\u003cspan\u003emm with cell\u003c\/span\u003e\u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003efor \u003c\/span\u003e\u003cspan\u003e130-190mm\u003c\/span\u003e\u003cspan\u003e \u003cspan name=\"OLE_LINK4\"\u003eF\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eixed diameter\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eERF glass\u003c\/span\u003e\u003cspan\u003e 150mm with \u003c\/span\u003e\u003cspan\u003ecell,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003efor 1\u003c\/span\u003e\u003cspan\u003e50-220mm\u003c\/span\u003e\u003cspan\u003e Fixed diameter\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eERF glass\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e200\u003c\/span\u003e\u003cspan\u003emm with cell\u003c\/span\u003e\u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003efor \u003c\/span\u003e\u003cspan\u003e200-250mm\u003c\/span\u003e\u003cspan\u003e Fixed diameter\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSolar Discover Dualband Energy Rejection Filter (ERF), at selected size :\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2\"\u003c\/li\u003e\n\u003cli\u003e130mm\u003c\/li\u003e\n\u003cli\u003e150mm\u003c\/li\u003e\n\u003cli\u003e200mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual \u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/antlia-filters-warranty?_pos=1\u0026amp;_psq=antlia+warran\u0026amp;_ss=e\u0026amp;_v=1.0\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eWarranty: 3-years\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003efor this item is not accepted once it has been disassembled.\u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"2\"","offer_id":45745460543717,"sku":"AF-ERF-2","price":120.0,"currency_code":"CAD","in_stock":true},{"title":"130mm","offer_id":45745460576485,"sku":"AF-ERF-130","price":1000.0,"currency_code":"CAD","in_stock":true},{"title":"150mm","offer_id":45745460609253,"sku":"AF-ERF-150","price":1781.0,"currency_code":"CAD","in_stock":true},{"title":"200mm","offer_id":45745460642021,"sku":"AF-ERF-200","price":3233.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAg8LfrrwYo2Oq7ygIw6Ac46Ac.jpg?v=1777043371"},{"product_id":"antlia-2-extension-tube-for-5a-cak-solar-discover-assembly","title":"Antlia 2\" Extension tube for 5Å CaK Solar Discover Assembly","description":"\u003ch2\u003eAntlia 2\" Extension tube for 5Å CaK Solar Discover Assembly\u003c\/h2\u003e\n\u003cdiv class=\"product info description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv data-element=\"main\" data-appearance=\"contained\" data-content-type=\"row\"\u003e\n\u003cdiv data-pb-style=\"P21R39H\" data-element=\"inner\" data-video-fallback-src=\"\" data-video-lazy-load=\"true\" data-video-play-only-visible=\"true\" data-video-loop=\"true\" data-background-type=\"image\" data-background-images=\"{}\" data-parallax-speed=\"0.5\" data-enable-parallax=\"0\"\u003e\n\u003cdiv data-element=\"main\" data-appearance=\"default\" data-content-type=\"text\"\u003e\n\u003cp\u003eThis 2\" extension tube allows you to achieve additional back focus, if needed, when using the Antlia 5Å CaK Solar Discoverer Assembly with a Barlow lens.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 294pt;\" width=\"390\" cellspacing=\"0\" cellpadding=\"0\" border=\"0\" data-mce-style=\"border-collapse: collapse; width: 294pt;\"\u003e\n\u003ccolgroup\u003e\n\u003ccol style=\"mso-width-source: userset; mso-width-alt: 4754; width: 98pt;\" span=\"3\" width=\"130\" data-mce-style=\"mso-width-source: userset; mso-width-alt: 4754; width: 98pt;\"\u003e \u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 15.0pt;\" height=\"20\" data-mce-style=\"height: 15.0pt;\"\u003e\n\u003ctd style=\"height: 15.0pt; width: 98pt;\" width=\"130\" class=\"xl67\" height=\"20\" data-mce-style=\"height: 15.0pt; width: 98pt;\"\u003eProduct\u003c\/td\u003e\n\u003ctd style=\"border-left: none; width: 98pt;\" width=\"130\" class=\"xl66\" data-mce-style=\"border-left: none; width: 98pt;\"\u003eXT-50\u003c\/td\u003e\n\u003ctd style=\"border-left: none; width: 98pt;\" width=\"130\" class=\"xl66\" data-mce-style=\"border-left: none; width: 98pt;\"\u003eXT-70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 15.0pt;\" height=\"20\" data-mce-style=\"height: 15.0pt;\"\u003e\n\u003ctd style=\"height: 15.0pt; border-top: none;\" class=\"xl67\" height=\"20\" data-mce-style=\"height: 15.0pt; border-top: none;\"\u003eLength\u003c\/td\u003e\n\u003ctd style=\"border-top: none; border-left: none;\" class=\"xl66\" data-mce-style=\"border-top: none; border-left: none;\"\u003e50mm\u003c\/td\u003e\n\u003ctd style=\"border-top: none; border-left: none;\" class=\"xl66\" data-mce-style=\"border-top: none; border-left: none;\"\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e2\" Extension tube for 5Å CaK Solar Discover Assembly, at selected length :\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e50mm\u003c\/li\u003e\n\u003cli\u003e70mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia's warranty\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"50mm","offer_id":45764488495333,"sku":"AF-XT-50","price":20.0,"currency_code":"CAD","in_stock":true},{"title":"70mm","offer_id":45764488528101,"sku":"AF-XT-70","price":30.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/paar-af-xt-50_5dcd232c-f471-4186-93d6-042a922ff122.jpg?v=1777043379"},{"product_id":"antlia-u-venus-imaging-filter-1-25-uvenus","title":"Antlia U-Venus Imaging Filter - 1.25'' (UVENUS)","description":"\u003ch2\u003eAntlia U-Venus Imaging Filter - 1.25''\u003c\/h2\u003e\n\u003cp\u003eAntlia Venus-U filter is designed for imaging the cloud structure of Venus and Jupiter with CCD cameras on a telescope. Cloud details primarily reflect in the ultraviolet band which cannot normally be imaged using broadband filters. The Venus-U filter uses the latest dielectric interference coating technology to achieve high transmission efficiency and exceptional isolation of the critical UV bandwidths.\u003c\/p\u003e\n\u003cp\u003eThe filter effectively blocks the contrast damaging frequencies beyond 400nm which typically swamp the ultraviolet cloud details on camera sensors. Like the highest quality Antlia LRGB filters, the U-Venus filter minimizes halos around bright stars and increase the contrast.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommendations in the use of this filter:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. When U-Venus filter is used with a planetary camera, it is recommended to remove any protective UV-IR window in front of a color planetary camera because this filter may attenuate transmittance of the critical ultraviolet band that contains cloud details.\u003c\/p\u003e\n\u003cp\u003e2. The lower the frequency in the UV band, the longer will be the exposure to achieve sufficient signal in your image. The sensitivity of most sensors also decreases rapidly at shorter UV wavelengths.\u003c\/p\u003e\n\u003cp\u003e3. It should be noted that when using DSLR to shoot ultraviolet flowers, the camera needs to be specially modified to remove the infrared cut filter inside the camera.\u003c\/p\u003e\n\u003cp\u003e4. In non astronomical use, the lighting conditions may block UV transmissions e.g. the UV contents of electronic flash emission, because of a combination of lower emission at shorter wavelengths and increased absorption by the glass of the flash tube. These factors combine together to require a substantially increased exposure time (for continuous UV sources), UV intensity and ISO sensitivity as the wavelength decreases.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNon-astronomical applications：\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse for general UV photography (flowers, health of plants,insects, forensics and medical imaging)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1.25”(M28.5*0.6)\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNotes:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1.Using the filter for visual observations is impossible due to the eye's insensitivity to this spectral range (UV).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2.This filter is NOT to be used for visual observations, specifically the sun or UV light sources.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgkves9gUoxOPwITCgBjjIBA.jpg?v=1723664380\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgj-es9gUon5rY2wYwoAY4rgQ.jpg?v=1723664386\" alt=\"\"\u003e\u003c\/h3\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eoptical substrate\u003c\/li\u003e\n\u003cli\u003eThickness: 1.25” mounted (2mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/li\u003e\n\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003cli\u003eTave＞80%\u003c\/li\u003e\n\u003cli\u003eOD3（＞0.001）@ 200-1050nm\u003c\/li\u003e\n\u003cli\u003e2 sides Dielectric multi-coating\u003c\/li\u003e\n\u003cli\u003eSingle \/ Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eAntlia U-Venus Imaging Filter - 1.25''\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia \u003cspan data-mce-fragment=\"1\"\u003e3-Years Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45972921909477,"sku":"ANT-UVENUS","price":282.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAgj-es9gUosJvb9gQwoAY4oAY.jpg?v=1777043426"},{"product_id":"antlia-alp-t-dualband-3nm-oiii-h-a-filter-for-f-4-slower-2-mounted-alp-t-2-haoiii-3nm","title":"Antlia ALP-T Dual Band Ha \u0026 OIII 3nm 2\" Filter","description":"\u003ch1\u003eAntlia ALP-T Dualband 3nm Ha + OIII 2'' Filters\u003c\/h1\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter is a dual narrowband filter, which lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band SII\u0026amp;Hb filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes its durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 656.3nm\u003c\/li\u003e\n\u003cli\u003eOxygen III: 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 90%\u003c\/li\u003e\n\u003cli\u003eOxygen III: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"187\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"152\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"144\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-alpha\"}'\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Oxygen III\"}'\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003eFWHM\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL\"}'\u003eCWL\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"656.3nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e656.3nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"500.7nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e500.7nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak transmission\"}'\u003ePeak transmission\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e90.00%\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e90.00%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003eBlocking\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e≥OD4.5 @ 300-1100nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter thickness\"}'\u003eFilter thickness\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2mm+\/-0.05mm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Optical, Single \\\/ Non-glued substrate \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eOptical, Single \/ Non-glued substrate \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"40\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003eSurface Quality\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O- \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O- \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better. \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eLambda\/4 or better. \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003eParallelism\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eless than 30 arcsec \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003eFilter Ring\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75) \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2’’ (M48*0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\" data-mce-style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII\u0026amp;H-beta Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"241\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"214\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"235\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"\"}' align=\"left\" height=\"21\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Sulfur-II\"}' align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-Beta\"}' align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eHydrogen-Beta\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}' align=\"center\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}' align=\"center\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"CWL (Central Wavelength)\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"672.4nm\"}' align=\"center\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"486.1nm\"}' align=\"center\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Peak Transmission\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.9\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e90.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.85\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e85.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e≥OD4.5 @ 300-1100nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter Thickness\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \" Optical, Single \\\/ Non-glued substrate\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O-13830\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better.\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eParallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75)\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFilter Ring:\u003cbr\u003e2’’ (M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46118944866533,"sku":"AF-ALP-T-2-HaOIII-3nm","price":533.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"antlia-alp-t-sii-hb-3-5nm-duo-band-2-filter","title":"Antlia ALP-T Dual Band SII \u0026 Hb 3.5nm 2\" Filter","description":"\u003ch1\u003eAntlia ALP-T Dual band 3.5nm SII\u0026amp;Hb 2'' Filter\u003c\/h1\u003e\n\u003ch4\u003eProduct Details\u003c\/h4\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv data-content-type=\"row\" data-appearance=\"contained\" data-element=\"main\"\u003e\n\u003cdiv data-enable-parallax=\"0\" data-parallax-speed=\"0.5\" data-background-images=\"{}\" data-background-type=\"image\" data-video-loop=\"true\" data-video-play-only-visible=\"true\" data-video-lazy-load=\"true\" data-video-fallback-src=\"\" data-element=\"inner\" data-pb-style=\"IISSWKQ\"\u003e\n\u003cdiv data-content-type=\"text\" data-appearance=\"default\" data-element=\"main\"\u003e\n\u003cp\u003eThe ALP-T dual band 3.5nm SII\u0026amp;Hb filter is a dual narrowband filter, which lets the deep red Sulfur-II 672.4nm and the blue Hydrogen-Beta 486.1nm lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3.5nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and H-beta emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eIt is a significant addition to the popular Antlia ALP-T dual-band Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with high signal-to-noise ratios and greater contrast than without it.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\/p\u0026gt;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses SII 672.4nm and H-Beta 486.1nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the deep red and blue at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3.5nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band Ha\u0026amp;OIII filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves SNR( signal-to-noise)\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes filter durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3.5nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 672.4nm\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 90%\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 85%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp align=\"left\" class=\"western\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\" data-mce-style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII\u0026amp;H-beta Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"241\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"214\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"235\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Sulfur-II\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-Beta\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eHydrogen-Beta\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL (Central Wavelength)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"672.4nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"486.1nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak Transmission\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e90.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.85\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e85.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e≥OD4.5 @ 300-1100nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Thickness\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \" Optical, Single \\\/ Non-glued substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O-13830\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better.\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eParallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFilter Ring:\u003cbr\u003e2’’ (M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46135584293093,"sku":"AF-ALP-T-2-SIIHb-3.5nm","price":511.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-siihb-3.5nm-2.jpg?v=1777043454"},{"product_id":"antlia-alp-t-dual-band-ha-oiii-3nm-sii-hb-3-5nm-2-filter-set","title":"Antlia ALP-T Dual Band Ha \u0026 OIII 3nm + SII \u0026 Hb 3.5nm 2\" Filter Set","description":"\u003ch1\u003eAntlia ALP-T Dual Band Ha\u0026amp;OIII 3nm + SII\u0026amp;Hb 3.5nm 2\" Filter Set\u003c\/h1\u003e\n\u003ch2\u003eHa\u0026amp;OIII 3nm\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter is a dual narrowband filter, which lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band SII\u0026amp;Hb filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes its durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 656.3nm\u003c\/li\u003e\n\u003cli\u003eOxygen III: 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 90%\u003c\/li\u003e\n\u003cli\u003eOxygen III: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSII\u0026amp;Hb 3.5nm Filter\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe ALP-T dual band 3.5nm SII\u0026amp;Hb filter is a dual narrowband filter, which lets the deep red Sulfur-II 672.4nm and the blue Hydrogen-Beta 486.1nm lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3.5nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and H-beta emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eIt is a significant addition to the popular Antlia ALP-T dual-band Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with high signal-to-noise ratios and greater contrast than without it.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\/p\u0026gt;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses SII 672.4nm and H-Beta 486.1nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the deep red and blue at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3.5nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band Ha\u0026amp;OIII filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves SNR( signal-to-noise)\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes filter durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3.5nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 672.4nm\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 90%\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 85%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"187\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"152\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"144\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-alpha\"}' valign=\"middle\" align=\"center\"\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Oxygen III\"}' valign=\"middle\" align=\"center\"\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eFWHM\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"CWL\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eCWL\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"656.3nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e656.3nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"500.7nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e500.7nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Peak transmission\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003ePeak transmission\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' valign=\"middle\" align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.9\"\u003e90.00%\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' valign=\"middle\" align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.9\"\u003e90.00%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eBlocking\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e≥OD4.5 @ 300-1100nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter thickness\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eFilter thickness\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2mm+\/-0.05mm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Optical, Single \\\/ Non-glued substrate \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eOptical, Single \/ Non-glued substrate \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}' valign=\"middle\" align=\"center\" height=\"40\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O- \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O- \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better. \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eLambda\/4 or better. \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eParallelism\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eless than 30 arcsec \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eFilter Ring\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75) \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2’’ (M48*0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\" data-mce-style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII\u0026amp;H-beta Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"241\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"214\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"235\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Sulfur-II\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-Beta\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eHydrogen-Beta\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL (Central Wavelength)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"672.4nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"486.1nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak Transmission\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e90.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.85\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e85.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e≥OD4.5 @ 300-1100nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Thickness\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \" Optical, Single \\\/ Non-glued substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O-13830\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better.\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eParallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFilter Ring:\u003cbr\u003e2’’ (M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3.5nm SII\u0026amp;Hb Filter 2\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46135608017125,"sku":"AF-ALP-T-2-HaOIII-SIIHb-3nm-SET","price":1008.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"antlia-hb-3nm-narrowband-pro-2-filter","title":"Antlia H-Beta 3nm Narrowband Pro 2'' Filter (HB-PRO-2)","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia H-Beta 3nm Narrowband Pro 2'' Filter\u003c\/h1\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003cdiv data-content-type=\"row\" data-appearance=\"contained\" data-element=\"main\"\u003e\n\u003cdiv data-enable-parallax=\"0\" data-parallax-speed=\"0.5\" data-background-images=\"{}\" data-background-type=\"image\" data-video-loop=\"true\" data-video-play-only-visible=\"true\" data-video-lazy-load=\"true\" data-video-fallback-src=\"\" data-element=\"inner\" data-pb-style=\"L0HDTR5\"\u003e\n\u003cdiv data-content-type=\"text\" data-appearance=\"default\" data-element=\"main\"\u003e\n\u003cp\u003eThe Antlia H-Beta Pro narrowband filter optimizes the full width at half maximum (FWHM) to a 3nm bandpass. As the bandwidth narrows, these 3nm Pro narrowband filters enhance the contrast of emission targets by effectively reducing unwanted background signals. Designed to achieve an impressive 88% transmission at the 486.1nm line, Antlia H-Beta 3nm Pro filters provide maximum signal and well-defined nebula\u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse; width: 48pt;\" width=\"64\" cellspacing=\"0\" cellpadding=\"0\" border=\"0\"\u003e\n\u003ccolgroup\u003e \u003ccol style=\"width: 48pt;\" width=\"64\"\u003e \u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 15.0pt;\" height=\"20\"\u003e\n\u003ctd style=\"height: 15.0pt; width: 48pt;\" width=\"64\" align=\"right\" class=\"xl66\" height=\"20\"\u003e255.15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003estructures.\u003c\/p\u003e\n\u003cp\u003eThe out-of-band blocking specification is rated at OD5 (0.001%), ensuring excellent signal-to-noise ratio (SNR) and effective cutoff rates to minimize interference from other wavelengths. These improved sharp cutoff astrophotography 3nm Pro filters are specifically engineered to reduce halos around bright stars.\u003c\/p\u003e\n\u003cp\u003eThe Antlia 3nm Pro series currently comprises Ha, SII, OIII, and H-Beta filters that capture exceptionally narrow data from four channels, enabling a greater range of combinations in post-production to meet your diverse requirements.\u003c\/p\u003e\n\u003cp\u003eIt is important to note that Antlia also offers dual narrowband filters designed for OSC cameras: the ALP-T Dualband Ha\u0026amp;OIII 3nm and SII\u0026amp;Hb 3.5nm. The synergy of these two dual band filters enables the capture of exceptionally narrow-band images with OSC cameras by acquiring spectral data from four channels—Ha, OIII, SII, and Hb. The spectra from these four channels can be separated and recombined into various color palettes during post-processing. The resulting images can enhance luminance contrast in traditional RGB-balanced images or facilitate the creation of visuals in several popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, among others. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh transmittance and smallest bandwidth to maximize contrast\u003c\/li\u003e\n\u003cli\u003eSteep spectral profile minimizes halos around bright stars\u003c\/li\u003e\n\u003cli\u003eA single substrate to eliminate internal reflections\u003c\/li\u003e\n\u003cli\u003eNarrowband Objects: H-Beta Emission Nebulae\u003c\/li\u003e\n\u003cli\u003eUse in light polluted areas and dark sites\u003c\/li\u003e\n\u003cli\u003eExtend imaging time when the moon is up\u003c\/li\u003e\n\u003cli\u003eAll Antlia narrowband Pro filters can be used down to f\/3 with minimal loss of signal\u003c\/li\u003e\n\u003cli\u003eAll Antlia Narrowband filters unmounted are edge blackened to eliminate internal reflections from stray light\u003c\/li\u003e\n\u003cli\u003eSuperior optical reliability reduces post image processing\u003c\/li\u003e\n\u003cli\u003eThis filter is only effective for deep sky objects that contain H-Beta emissions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS\u003c\/p\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute ca_additional_info\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"widget block block-static-block\"\u003e\n\u003cdiv data-content-type=\"row\" data-appearance=\"contained\" data-element=\"main\"\u003e\n\u003cdiv data-enable-parallax=\"0\" data-parallax-speed=\"0.5\" data-background-images=\"{}\" data-background-type=\"image\" data-video-loop=\"true\" data-video-play-only-visible=\"true\" data-video-lazy-load=\"true\" data-video-fallback-src=\"\" data-element=\"inner\" data-pb-style=\"PLHTXDI\"\u003e\n\u003cdiv data-content-type=\"text\" data-appearance=\"default\" data-element=\"main\"\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM (Full width at half maximum): 3nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength): 486.1nm\u003c\/li\u003e\n\u003cli\u003ePeak Transmission: 88%\u003c\/li\u003e\n\u003cli\u003eBlocking: \u0026gt; 5 OD (out of band blocking) @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront: Lambda\/4 or better\u003c\/li\u003e\n\u003cli\u003eParallelism: less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ (M48x0.75)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting\u003c\/li\u003e\n\u003cli\u003eBlack anodized finish\u003c\/li\u003e\n\u003cli\u003eLaser engraving No fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp style=\"line-height: 10px;\"\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia H-Beta 3nm Narrowband Pro 2'' Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46315355504869,"sku":"AF-HB-PRO-2","price":560.9,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-oiii-3nm-narrowband-pro-2-filter-open-box-astronomy-plus-1.webp?v=1731096310"},{"product_id":"antlia-alp-t-dual-band-sii-oiii-3nm-2-filter","title":"Antlia ALP-T Dual Band SII \u0026 OIII 3nm 2\" Filter","description":"\u003ch1\u003eAntlia ALP-T Dualband 3nm SII + OIII 2'' Filters\u003c\/h1\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm SII\u0026amp;OIII Filter is a dual narrowband filter, which lets the deep-red SII and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, SII line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dual Band SII \u0026amp; OIII 3nm 2\" Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46768609460453,"sku":"AF-ALP-T-2-SIIOIII-3nm","price":554.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"antlia-alp-t-dual-band-ha-oiii-3nm-sii-hb-3-5nm-2-filter-set-copy","title":"Antlia ALP-T Dual Band Ha \u0026 OIII + SII \u0026 OIII 3nm 2\" Filter Set","description":"\u003ch1\u003eAntlia ALP-T Dual Band Ha \u0026amp; OIII + SII \u0026amp; OIII 3nm 2\" Filter Set\u003c\/h1\u003e\n\u003ch2\u003eHa\u0026amp;OIII 3nm\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter is a dual narrowband filter, which lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;OIII version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes its durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 656.3nm\u003c\/li\u003e\n\u003cli\u003eOxygen III: 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 90%\u003c\/li\u003e\n\u003cli\u003eOxygen III: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSII\u0026amp;OIII 3nm Filter\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm SII\u0026amp;OIII Filter is a dual narrowband filter, which lets the deep-red SII and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, SII line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3.5nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 672.4nm\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 90%\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 85%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"187\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"152\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"144\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-alpha\"}'\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Oxygen III\"}'\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003eFWHM\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL\"}'\u003eCWL\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"656.3nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e656.3nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"500.7nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e500.7nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak transmission\"}'\u003ePeak transmission\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}'\u003e90.00%\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}'\u003e90.00%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003eBlocking\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e≥OD4.5 @ 300-1100nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter thickness\"}'\u003eFilter thickness\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2mm+\/-0.05mm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Optical, Single \\\/ Non-glued substrate \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptical, Single \/ Non-glued substrate \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"40\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003eSurface Quality\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O- \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O- \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better. \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eLambda\/4 or better. \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003eParallelism\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eless than 30 arcsec \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003eFilter Ring\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75) \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2’’ (M48*0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII \u0026amp; OIII Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm SII\u0026amp;OIII Filter 2\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46768630956261,"sku":"AF-ALP-T-2-HaOIII-SIIOIII-3nm-SET","price":1065.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"antlia-8-el-uhc-pro-visual-enhancer-filter-2-mounted","title":"Antlia 8-EL UHC Pro Visual Enhancer Filter - 2'' Mounted","description":"\u003ch1\u003eAntlia 8-EL UHC Pro Visual Enhancer Filter - 2'' Mounted\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia 8-EL UHC Pro Visual Enhancer filter is a high-\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eperformance optical filter designed for visual observation of celestial objects.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is designed to combat moderate light pollution while maintaining excellent color balance, making it ideal for visual observation\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eof\u003c\/span\u003e\u003cspan\u003e emission nebulae, planetary nebulae, and other objects. It selectively enhances key emission lines through its high-transmission design, including:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 671.6nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 673.1nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 486.1nm (H-beta)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 495.9nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 500.7nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 654.8nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 658.3nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 656.3nm (H-alpha)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 671.6nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 673.1nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe combination of high transmission (\u0026gt;95%) and sodium-light suppression allows observers to perceive fine structural details in Planetary nebula, emission nebula targets, even under moderate light pollution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/4\/2\/ABUIABAEGAAgv-GkvgYooeKorQUwvgo4gQY.png\" alt=\"Spectrum Curve Antlia 8-EL UHC Pro Visual Enhancer Filter.png\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. \u003c\/span\u003e\u003cspan\u003eVisual Recommendations\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1) \u003c\/span\u003e\u003cspan\u003eLarge-Aperture Telescopes: Due to reduced photon capture by the human eye at night\u003c\/span\u003e\u003cspan\u003e，\u003c\/span\u003e\u003cspan\u003ewe recommend using large-aperture telescopes (e.g., 8-inch or larger) to ensure sufficient light throughput. This compensates for the inherent sensitivity drop in low-light conditions while maintaining the filter’s balance between light pollution suppression and target brightness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2) \u003c\/span\u003e\u003cspan\u003eVisual Enhanced Contrast in Nebulae:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8-EL\u003c\/span\u003e\u003cspan\u003e（\u003c\/span\u003e\u003cspan\u003e8 emission lines) and target recommendations\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"1\" cellspacing=\"0\" style=\"width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEmission lines\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuggested observation targets\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e486.1nm (H-beta)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula,NGC 7000 North America Nebula,M16 Eagle Nebula, M8 Lagoon Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e495.9nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003e-Recommended Nebulae: M57 Ring Nebula,NGC6960 Veil Nebula,NGC6543 Cat's Eye Nebula,NGC6302 Butterfly Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e500.7nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, M57 Ring Nebula, NGC 6992 Veil Nebula on the east side, IC 2177 Seagull Nebula, M104 Broad-shouldered Cap Galaxy\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e654.8nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eNGC 6960 Veil Nebula, M1 Crab Nebula, M57 Ring Nebula, NGC 6543 Cat's Eye Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e658.3nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, NGC 6960 Veil Nebula, M57 Ring Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e656.3nm (H-alpha)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, IC434 Horsehead Nebula, NGC7000 North America Nebula, M16 Eagle Nebula, M8 Lagoon Nebula, NGC6960 Veil Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e671.6nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, IC434 Horsehead Nebula, M1 Crab Nebula, M16 Eagle Nebula, M57 Ring Nebula, NGC6543 Cat's Eye Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e673.1nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, M1 Cassiopeia Nebula, NGC 6960 Veil Nebula, IC 443 Jellyfish Nebula, M27 Sundial Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; height: 176.344px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 64.8014%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eAntlia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eMulti-band (8 emission lines)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003e2″ Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eM48 × 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003ePeak Transmission\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003e≥95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eUltra-thin, black anodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eMarkings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eLaser engraved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/4\/2\/ABUIABAEGAAgv-GkvgYooeKorQUwvgo4gQY.png\" alt=\"Spectrum Curve Antlia 8-EL UHC Pro Visual Enhancer Filter.png\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/antlia-filters-warranty\" rel=\"noopener\" target=\"_blank\"\u003eAntlia 3-Year Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":48246449209573,"sku":"AF-8-EL-UHC-Pro-2","price":169.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAg-5mlvgYogOHu7QQw6Ac46Ac.jpg?v=1777043842"},{"product_id":"antlia-nii-3nm-pro-narrowband-filter-2","title":"Antlia NII 3nm Pro Narrowband Filter - 2\" (NII-2)","description":"\u003ch2 data-section-id=\"4y7v9z\" data-start=\"86\" data-end=\"148\"\u003eAntlia NII Pro 3nm Filter – Maximum Narrowband Performance\u003c\/h2\u003e\n\u003cp data-start=\"150\" data-end=\"442\"\u003eThe \u003cstrong data-start=\"154\" data-end=\"183\"\u003eAntlia NII Pro 3nm filter\u003c\/strong\u003e is engineered to deliver exceptional performance in narrowband astrophotography, featuring an ultra-narrow \u003cstrong data-start=\"291\" data-end=\"315\"\u003e3nm bandwidth (FWHM)\u003c\/strong\u003e. This tight bandpass significantly enhances contrast in emission nebulae by effectively suppressing unwanted background light.\u003c\/p\u003e\n\u003cp data-start=\"444\" data-end=\"604\"\u003eWith an impressive \u003cstrong data-start=\"463\" data-end=\"509\"\u003e88% transmission at the NII line (654.8nm)\u003c\/strong\u003e, this filter ensures maximum signal capture and reveals fine, well-defined nebular structures.\u003c\/p\u003e\n\u003cp data-start=\"606\" data-end=\"893\"\u003eThe out-of-band blocking is rated at \u003cstrong data-start=\"643\" data-end=\"659\"\u003eOD5 (0.001%)\u003c\/strong\u003e, providing excellent signal-to-noise ratio (SNR) by minimizing interference from unwanted wavelengths. Its steep spectral profile is specifically designed to \u003cstrong data-start=\"818\" data-end=\"854\"\u003ereduce halos around bright stars\u003c\/strong\u003e, a common issue in narrowband imaging.\u003c\/p\u003e\n\u003chr data-start=\"895\" data-end=\"898\"\u003e\n\u003ch2 data-section-id=\"1iz91iu\" data-start=\"900\" data-end=\"916\"\u003eKey Features of the Nitrogen Filter\u003c\/h2\u003e\n\u003cul data-start=\"918\" data-end=\"1400\"\u003e\n\u003cli data-section-id=\"1m3dttu\" data-start=\"918\" data-end=\"973\"\u003e\n\u003cstrong data-start=\"920\" data-end=\"950\"\u003eUltra-narrow 3nm bandwidth\u003c\/strong\u003e for maximum contrast\u003c\/li\u003e\n\u003cli data-section-id=\"14unrg8\" data-start=\"974\" data-end=\"1037\"\u003e\n\u003cstrong data-start=\"976\" data-end=\"1009\"\u003eHigh transmission (up to 88%)\u003c\/strong\u003e for strong signal capture\u003c\/li\u003e\n\u003cli data-section-id=\"d6bgnu\" data-start=\"1038\" data-end=\"1098\"\u003e\n\u003cstrong data-start=\"1040\" data-end=\"1068\"\u003eExcellent halo reduction\u003c\/strong\u003e with steep spectral cutoffs\u003c\/li\u003e\n\u003cli data-section-id=\"xo455c\" data-start=\"1099\" data-end=\"1148\"\u003e\n\u003cstrong data-start=\"1101\" data-end=\"1129\"\u003eOD5 out-of-band blocking\u003c\/strong\u003e for superior SNR\u003c\/li\u003e\n\u003cli data-section-id=\"1razm6p\" data-start=\"1149\" data-end=\"1213\"\u003e\n\u003cstrong data-start=\"1151\" data-end=\"1178\"\u003eSingle substrate design\u003c\/strong\u003e to minimize internal reflections\u003c\/li\u003e\n\u003cli data-section-id=\"yyev6k\" data-start=\"1214\" data-end=\"1279\"\u003e\n\u003cstrong data-start=\"1216\" data-end=\"1255\"\u003eEdge-blackened (unmounted versions)\u003c\/strong\u003e to reduce stray light\u003c\/li\u003e\n\u003cli data-section-id=\"5f88e9\" data-start=\"1280\" data-end=\"1335\"\u003e\n\u003cstrong data-start=\"1282\" data-end=\"1308\"\u003eCompatible down to f\/3\u003c\/strong\u003e with minimal signal loss\u003c\/li\u003e\n\u003cli data-section-id=\"1an39o4\" data-start=\"1336\" data-end=\"1400\"\u003e\n\u003cstrong data-start=\"1338\" data-end=\"1366\"\u003eHigh optical reliability\u003c\/strong\u003e, reducing post-processing needs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1402\" data-end=\"1405\"\u003e\n\u003ch2 data-section-id=\"wggvqn\" data-start=\"1407\" data-end=\"1423\"\u003eApplications\u003c\/h2\u003e\n\u003cul data-start=\"1425\" data-end=\"1594\"\u003e\n\u003cli data-section-id=\"1mtrtd1\" data-start=\"1425\" data-end=\"1463\"\u003eIdeal for \u003cstrong data-start=\"1437\" data-end=\"1461\"\u003eNII emission nebulae\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"30qv49\" data-start=\"1464\" data-end=\"1528\"\u003eEffective in both \u003cstrong data-start=\"1484\" data-end=\"1526\"\u003elight-polluted and dark sky conditions\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1j7oxss\" data-start=\"1529\" data-end=\"1594\"\u003eAllows for \u003cstrong data-start=\"1542\" data-end=\"1592\"\u003eextended imaging sessions even under moonlight\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1596\" data-end=\"1599\"\u003e\n\u003ch3 data-section-id=\"fh0v9c\" data-start=\"1601\" data-end=\"1614\"\u003eImportant\u003c\/h3\u003e\n\u003cp data-start=\"1616\" data-end=\"1762\"\u003eThis filter is designed specifically for \u003cstrong data-start=\"1657\" data-end=\"1708\"\u003edeep-sky objects emitting in the NII wavelength\u003c\/strong\u003e and is not suitable for targets without NII emission.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"189d9zn\" data-start=\"340\" data-end=\"375\"\u003eNII (Nitrogen II – 654.8 nm)\u003c\/h2\u003e\n\u003cul data-start=\"418\" data-end=\"684\"\u003e\n\u003cli data-section-id=\"1dvsl5c\" data-start=\"418\" data-end=\"483\"\u003eCaptures \u003cstrong data-start=\"429\" data-end=\"450\"\u003enitrogen emission\u003c\/strong\u003e, often located near Hα regions\u003c\/li\u003e\n\u003cli data-section-id=\"1pa7v3g\" data-start=\"484\" data-end=\"554\"\u003eReveals \u003cstrong data-start=\"494\" data-end=\"527\"\u003efine structures and filaments\u003c\/strong\u003e not always visible in Hα\u003c\/li\u003e\n\u003cli data-section-id=\"9ku0j0\" data-start=\"555\" data-end=\"616\"\u003eAdds \u003cstrong data-start=\"562\" data-end=\"584\"\u003edepth and contrast\u003c\/strong\u003e when combined with Hα and SII\u003c\/li\u003e\n\u003cli data-section-id=\"1b1vt6j\" data-start=\"617\" data-end=\"684\"\u003eLess commonly used alone, but very powerful in advanced imaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"686\" data-end=\"772\"\u003e\u003cem\u003eBest for: enhancing detail in emission nebulae and advanced narrowband combinations\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7em; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 14px; font-family: 微软雅黑; color: #000000;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABAEGAAg_eukvgYo-MD7twIwwQo4-QU.png?v=1768939861\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 16px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 16px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 16px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 16px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 16px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: 13px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: 13px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-indent: 0; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px; color: #000000;\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-indent: 0; margin-bottom: 0;\"\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: 13px;\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: 13px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #000000; font-family: Arial; font-size: 13px;\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-indent: 0; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 13px;\"\u003eTHIS \u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 13px;\"\u003eFILTER\u003c\/span\u003e\u003cspan style=\"font-family: 宋体; font-size: 13px;\"\u003e \u003cspan style=\"font-family: Arial;\"\u003eDIRECTLY\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-indent: 0; margin-bottom: 0;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"font-family: 宋体; font-size: 13px;\"\u003e \u003cspan style=\"font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"line-height: 1.7em; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 14px; font-family: 微软雅黑; color: #000000;\"\u003eTechnical Specifications \u003c\/span\u003e\u003c\/h3\u003e\n\u003cp style=\"line-height: 1.7em; margin-bottom: 1px;\"\u003e \u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse;\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eNII 3nm Pro\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 23px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e3\u003c\/span\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003en\u003c\/span\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003em\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e654.8nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e88\u003c\/span\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eBlocking\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e\u0026gt; 5 OD (out of band blocking) @ 300-1100nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eParallelism\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000;\" valign=\"top\" width=\"245\"\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 0px 7px; border-left: 1px solid #000000; border-right: 1px solid #000000; border-top: none; border-bottom: 1px solid #000000; word-break: break-all;\" valign=\"top\" width=\"368\"\u003e\n\u003cp style=\"text-align: center; line-height: 16px; margin-bottom: 0;\"\u003e\u003cspan style=\"font-size: 13px; font-family: 微软雅黑; color: #000000;\"\u003e2'' (M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"line-height: 1.7em; margin-bottom: 1px;\"\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABAEGAAg_eukvgYo-MD7twIwwQo4-QU_1024x1024.png?v=1768939861\"\u003e\u003c\/div\u003e\n\u003ch3 style=\"line-height: 1.7em; margin-bottom: 1px;\"\u003e\u003cspan style=\"font-size: 14px; font-family: 微软雅黑; color: #000000;\"\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli style=\"line-height: 1.7em;\"\u003e\u003cspan style=\"font-size: 14px; font-family: 微软雅黑; color: #000000;\"\u003eNII 3nm Pro Narrowband Filter - 2''\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"station-tabs-tabtitle\"\u003e\n\u003cspan id=\"station-tabs-tab_ht-i1-t67\" class=\"station-tabs-tab\" aria-controls=\"station-tabs-tabpanel_ht-i1-t67\" data-slug=\"in-the-box\" role=\"tab\" aria-selected=\"false\" tabindex=\"-1\"\u003e\u003cspan class=\"station-tabs-tabtext\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cdiv class=\"station-tabs-tabpanel\" id=\"station-tabs-tabpanel_ht-i1-t67\" aria-labelledby=\"station-tabs-tab_ht-i1-t67\" role=\"tabpanel\" aria-hidden=\"true\"\u003e\n\u003cdiv class=\"station-tabs-tabcontent\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"station-tabs-tabtitle\"\u003e\u003cspan id=\"station-tabs-tab_ht-i1-t72\" class=\"station-tabs-tab mod-last is-active\" aria-controls=\"station-tabs-tabpanel_ht-i1-t72\" data-slug=\"warranty-amp-manuals\" role=\"tab\" aria-selected=\"true\" tabindex=\"0\"\u003e\u003cspan class=\"station-tabs-tabtext\"\u003eWarranty \u0026amp; Manuals\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"station-tabs-tabpanel is-active\" id=\"station-tabs-tabpanel_ht-i1-t72\" aria-labelledby=\"station-tabs-tab_ht-i1-t72\" role=\"tabpanel\" aria-hidden=\"false\"\u003e\n\u003cdiv class=\"station-tabs-tabcontent\"\u003e\n\u003cp\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"line-height: 21px; margin-bottom: 1px;\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":48295753679077,"sku":"AF-NII-2","price":561.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Untitled_a73b3f96-ba0f-4460-950a-42a765e1b0fe.png?v=1777045233"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/collections\/antlia-filters-astronomy-plus.webp?v=1715807864","url":"https:\/\/astronomyplus.com\/collections\/antlia-filters.oembed?page=2","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}