{"title":"Optolong 10% Promo","description":"","products":[{"product_id":"optolong-l-pro-filter","title":"Optolong L-Pro Filter","description":"\u003ch1\u003eOptolong L-Pro Filter\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Optolong L-Pro Filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOptolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003eMain Use and Performance\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuitable for visual observation and astrophotography.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eL-Pro filter has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and globular star clusters. The same holds true for visual star observations.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eL-Pro filter alone can suppress infrared wavelength, and thus can be used at ease for “L” image shootings with CCDs.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLight pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSchott substrate material\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness 2.0 mm (1.25”\/2”\/77mm) | 1.0 mm (Clip series)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt; 30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHigh transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm\u0026amp;500nm, SII 672nm and H-beta 486nm).\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePrecision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).\u003c\/span\u003e \u003c\/p\u003e\n\u003ch4\u003eCoating Technology\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong L-Pro filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eL-Pro Filter\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":43697571135717,"sku":"OL-L-PRO-1.25","price":187.2,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":43697571168485,"sku":"OL-L-PRO-2","price":250.2,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS APS-C","offer_id":43697571201253,"sku":"OL-L-PRO-EOS-APS-C","price":314.1,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS Full Frame","offer_id":43697571234021,"sku":"OL-L-PRO-EOS-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Z full frame","offer_id":48076843188453,"sku":"OL-L-PRO-NK-Z","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Full Frame","offer_id":43697571266789,"sku":"OL-L-PRO-NK-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Sony Full Frame (2023 Version)","offer_id":43697571332325,"sku":"OL-L-PRO-SN-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-R","offer_id":46339805970661,"sku":"","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"77mm Round Mounted","offer_id":43697571299557,"sku":"OL-L-PRO-77","price":364.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-pro-filter-astronomy-plus-1.webp?v=1690485403"},{"product_id":"optolong-l-enhance-filter","title":"Optolong L-eNhance Duo Band Filter","description":"\u003ch1\u003eOptolong L-eNhance Duo Band Filter\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe relentless spread or urbanization and its associated light pollution have become a growing problem for all amateur astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel. The filter is available in the following sizes: 1.25″, 2″ \u0026amp; clip filter for Canon EOS. The clip version is compatible with all Canon EF lenses, but doesn’t suit Canon EF-S lenses. The following cameras are compatible: 7D2, 80D, 800D, 77D, 70D, 760D, 750D, 700D, 650D, 600D, 550D, 500D, 400D, 100D, 1100D, 1200D \u0026amp; 1300D.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Optolong L-eNhance Filterprovides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and monochrome CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life.\u003cbr data-mce-fragment=\"1\"\u003eTherefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003eMain Use and Performance\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuitable for visual observation and astrophotography.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLight pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cem\u003e\u003cstrong\u003eL-Enhance Performance\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/www.optolong.com\/uploads\/images\/20210703\/48c07ebe8a88353aa27c0031c7e973d0.png\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/em\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eSbustrate:\u003c\/em\u003e B270\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cem\u003eThickness:\u003c\/em\u003e 1.85mm\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eTpeak:\u003c\/em\u003e  T\u0026gt;90%\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eBlocking range:\u003c\/em\u003e 300-1000nm\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eBlocking depth:\u003c\/em\u003e light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eSurface quality:\u003c\/em\u003e 60\/40\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eTransmitted Wavefront RMS:\u003c\/em\u003e λ\/4\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eParallelism:\u003c\/em\u003e 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eMajor Emission Lines of Nebulae : \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eH-Alpha : 656.3nm\u003c\/li\u003e\n\u003cli\u003eH-Beta : 486.1nm\u003c\/li\u003e\n\u003cli\u003eOIII : 495.nm \u0026amp; 500.7 nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOptolong 3-Years Warranty\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697303257317,"sku":"OL-L-ENHANCE-1.25","price":225.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697303290085,"sku":"OL-L-ENHANCE-2","price":288.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C Clip","offer_id":43697303322853,"sku":"OL-L-ENHANCE-EOS","price":325.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-enhance-filter-astronomy-plus-1.webp?v=1690485404"},{"product_id":"optolong-l-extreme-dual-band-narrow-band-filter-l-extreme","title":"Optolong L-Extreme Dual-Band Filter","description":"\u003ch1\u003eOptolong L-Extreme Dual-Band Astronomy NarrowBand Filter\u003c\/h1\u003e\n\u003cp\u003eThe advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines and there are also no nebula emission lines there. In this case, it isn’t letting light pollution come through so it maximizes nebula signals and the sky background is made darker while imaging.\u003c\/p\u003e\n\u003cp\u003eThe L-eXtreme filter should better isolate the emission lines and better protect from light pollution.\u003c\/p\u003e\n\u003ch4\u003eL-Extreme Introduction\u003c\/h4\u003e\n\u003cp\u003eOptolong L-eXtreme is a two 7 nm bandpass filter which can be used with one-shot color cameras like DSLR’s (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost-effectiveness of this filter allows amateurs to image a rich emission nebula, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be a better choice for fast systems at a competitive price. It isolates the H-alpha, and Oxygen-iii nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who are living in very light-polluted areas, or when the moon is out, the L-eXtreme will be a good filter.\u003c\/p\u003e\n\u003cp\u003eUnlike the L-eNhance filter which is a tri-band (transmits H-b, H-a, and O-iii), the L-eXtreme filter is dual-band that passes H-a and O-iii emission lines.\u003c\/p\u003e\n\u003cp\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O for the exploration of life.\u003c\/p\u003e\n\u003cp\u003eTherefore, Optolong highlights H-a, H-b, O-iii, and O-ii, and reduce the signal of sulfur.\u003c\/p\u003e\n\u003ch4\u003eL-eXtreme Performance:\u003c\/h4\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eI. Compare: L-eXtreme VS no filter © Vincent Cheng\u003c\/strong\u003e\u003c\/u\u003e \u003cimg height=\"489\" width=\"457\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/5bcdb1e79c79231df851f9b60f152ba9.png\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eII. NGC6946, Barnard 150 \u0026amp; Sh2-129 Flying Bat nebula ©José Jiménez\u003c\/strong\u003e\u003c\/u\u003e NGC6946, Barnard 150 \u0026amp; Sh2-129 Flying Bat nebula Canon 6D mod \u0026amp; WO SpaceCat 51 RGB 25 x 600\" ISO 3200 - Optolong L-Pro H-Alpha \u0026amp; OIII 20 x 1500\" ISO 3200 -\u003cu\u003e \u003cstrong\u003eOptolong L-eXtreme\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"252\" width=\"503\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/1840a8e24b716e2297a92bd4aa933ede.jpg\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIII. The Rosette and Cone Nebulas ©Starizona\u003c\/strong\u003e\u003c\/u\u003e The image of the Rosette and Cone Nebulas is an example under about the worst conditions: a very wide field of view (135mm lens, 8 x 5.5 degrees), a very fast focal ratio (f\/1.8) and with the 58% illuminated moon only 17 degrees outside the field of view!  It is 20 exposures of 90 seconds each with the ZWO ASI294.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"343\" width=\"500\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/5d3cbec016b1e67e43be0157c53c10a8.jpg\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIV. IC1396 Elephant Trunk nebula ©José Jiménez \u003c\/strong\u003e\u003c\/u\u003e A new job with Optolong L-eXtreme filter and the new Askar Lens FRA 400 tube; IC1396 Elephant Trunk nebula La Jonquera - Girona - Spain May 2020 Equipment used : Canon 6D mod Askar FRA 400mm Sharpstar Optics Fong Michael RGB 6 x 1500\" ISO 6400 \u003cu\u003e\u003cstrong\u003eOptolong L-eXtreme\u003c\/strong\u003e\u003c\/u\u003e Sky Watcher EQ6 Mount Guide camera QHY5 Flats, Darks \u0026amp; Bias Calibrated, stacked and processed with Pixinsight, final tweaks with Lightroom\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"331\" width=\"504\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/fd6ecb8b50249153970ab1b4eb64223e.jpg\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eV. NGC6188 Fighting Dragons of Ara  ©Tommy Lim KW  \u003c\/strong\u003e\u003c\/u\u003e OBJECTS: NGC6188 FIGHTING DRAGONS OF ARA LOCATION: MERSING, JOHOR CAMERA: QHY168C TELESCOPE: 4\" REFRACTOR MOUNT: SKYWATCHER AZ-EQ5GT FILTERS: OPTOLONG L-EXTREME FILTER. EXPOSURE: 30 X 300SEC Stacked in Siril and processed in Pixinsight.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"327\" width=\"508\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/e2b193114d02ba2a75138093d52f0e1c.jpg\" class=\"\"\u003e \u003cstrong\u003eWarm prompt\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAbout color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordana with the final product.\u003c\/li\u003e\n\u003cli\u003eAbout coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material object.\u003c\/li\u003e\n\u003cli\u003eAbout the style: in order to improve the product, the change of design\/appearance\/parameters has not been updated in time. Please see the subject produce.\u003c\/li\u003e\n\u003cli\u003eAbout the description: the series of this product have the same material, technology and design, different sizes only, please note.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch4\u003eSpectrum and Characteristic:\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eSbustrate: B270\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTpeak:  T\u0026gt;90%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking range: 300-1000nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking depth: light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e▲The \u003cspan style=\"color: #bc1f1f;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eRED\u003c\/strong\u003e\u003c\/span\u003e line shows the line of H-alpha.\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"color: #038b0b;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eGREEN\u003c\/strong\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eline shows the emmission of OIII. The artifical emission lines are shown in \u003cspan data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #ff8000;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eORANGE\u003c\/strong\u003e\u003c\/span\u003e.\u003c\/span\u003e\u003cimg height=\"110\" width=\"668\" data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" class=\"aligncenter lazyloaded\"\u003e\u003c\/p\u003e\n\u003ch4\u003eCoating Technology\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003ePacking\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOuter Box: silve box\u003c\/li\u003e\n\u003cli\u003ePlastic Box: PP material\u003c\/li\u003e\n\u003cli\u003eLining: imported high pressure white EVA material\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697369940197,"sku":"OL-L-EXTREME-1","price":300.6,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697369972965,"sku":"OL-L-EXTREME-2","price":388.8,"currency_code":"CAD","in_stock":true},{"title":"Nikon Z mirroless mount","offer_id":48076800622821,"sku":"OL-L-EXTREME-NK-Z","price":326.7,"currency_code":"CAD","in_stock":true},{"title":"EOS-R","offer_id":48076800655589,"sku":"OL-L-EXTREME-EOS-R","price":363.0,"currency_code":"CAD","in_stock":true},{"title":"Sony-FF","offer_id":48076800688357,"sku":"OL-L-EXTREME-S-FF","price":363.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-extreme-dual-band-filter-astronomy-plus-1.webp?v=1690487119"},{"product_id":"optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate","title":"Optolong L-Ultimate Dual-Band 3nm Filter","description":"\u003ch1\u003eOptolong L-Ultimate Filter\u003c\/h1\u003e\n\u003cp\u003eIt’s about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. …\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eOpotlong L-Ultimate Introduction\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eIt’s about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Used with DSLR, color\/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.\u003c\/p\u003e\n\u003cp\u003eThe advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.\u003c\/p\u003e\n\u003cp\u003eIt is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003ctable align=\"center\" cellpadding=\"1\" cellspacing=\"2\" border=\"1\" class=\"alignleft\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSbustrate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e30seconds\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eL-Ultimate Filter Performance\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNebulae Flying Bat and Squid in the constellation of Cepheus.\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eSquid (OU4) is a region characterized by very weak OIII emission with a bipolar shape reminiscent of planetary nebulae. Recent studies suggest that Ou4 is actually internal to SH2-129 (the H-alpha-emitting flying bat nebula, reddish in the image), generated by a triple star system located in the center (HR8119, visible as the bright star in the center of Squid).\u003cbr\u003eThe distance from our solar system is estimated at about 1300 light years.\u003cbr\u003eThe lights were taken over 2 years, with total integration equal to 29 hours (21.5 for OU4 and 7.5 for SH2-129).\u003cbr\u003eThis project gave me the opportunity to test the Omegon veTEC 571C camera and the Optolong L-Ultimate filter with excellent results for both products.\u003c\/p\u003e\n\u003cp\u003eLights: 258x300s (Ou4, L-Extreme) + 30x900s (Sh2-129, L-Ultimate)\u003c\/p\u003e\n\u003cp\u003eTelescope1: Apocromatic TS PhotoLine 102 f\/5,6 Triplet FPL53\u003cbr\u003eTelescope2: Takahashi FS60CB @ f\/4.2\u003cbr\u003eCamera1: ZWO ASI 294mc Pro\u003cbr\u003eCamera2: Omegon veTEC 571C\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eFilters: Optolong Astronomy Filter L-Extreme + L-Ultimate\u003cbr\u003eProcessing: DeepSkyStacker, Photoshop CC, PixInsight\u003cbr\u003eCredit:Tommaso Massimo Stella (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/8e82dcbd4356c2b25658ae4d38898da9.jpg\" alt=\"\" width=\"529\" height=\"361\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eObjects: Veil Nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCamera: QHY168C\u003cbr\u003eTelescope: Pentax 100 SDUF II F\/4\u003cbr\u003eMount: Skywatcher AZ-EQ5GT\u003cbr\u003eFilter: Optolong 3nm L-Ultimate Filter\u003cbr\u003eFrames: 13 x 240sec lights\u003cbr\u003eCredit:Tommy Lim KW (Malaysia)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/0a012c0ef16bddfb90595bf2502e3c51.jpg\" alt=\"\" width=\"531\" height=\"353\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSh2-132 The Lion nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eProsegue il test del filtro  Ultimate della Optolong Astronomy Filter\u003cbr\u003e96 light da 300 sec\u003cbr\u003eNo dark no flat\u003cbr\u003eCredit:Andrea Maggi\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/31ceb16a19983c46396af72fe7ba3cc1.jpg\" alt=\"\" width=\"500\" height=\"335\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSupernova remnant W63\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eSupernova remnant W63 glows like a faint cosmic smoke ring along the plane of the Milky Way toward the northern constellation Cygnus. Its spectral appearance is reflected in the region’s rich complex of interstellar clouds and dust by an eerie blue glow, captured with Optolong’s new dual band 3nn filter!! L-Ultimate…\u003c\/p\u003e\n\u003cp\u003eCanon Eos MK IV mod by CentralDS 20×900″ ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eSkywatcher AZ-GTI mount\u003cbr\u003eGuide camera ZWO ASI 120MM\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/4672efc207e69c658cf26c68e7bea6a4.jpg\" alt=\"\" width=\"504\" height=\"338\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSharpless 129\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCanon Eos MK IV mod by CentralDS 30×900″ ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/f94ddb185f8fe14b6659bda59bfa14f0.jpg\" alt=\"\" width=\"515\" height=\"338\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNGC6888 HOO Version\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eTelescope ASKAR 500\u003cbr\u003eCamera Zwo ASI 6200\u003cbr\u003eFilter Optolong 3nm\u003cbr\u003eSoftware Voyager\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloading\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/1d8c80c3e194a0161f9b4569df88ff1f.jpg\" alt=\"\" width=\"486\" height=\"324\" data-lazy-src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/1d8c80c3e194a0161f9b4569df88ff1f.jpg\" data-ll-status=\"loading\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNGC7635 \u0026amp; Sh2-157\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eDue ore stanotte da Saint Barthelemy\u003cbr\u003eTelescopio Askar 80 PH\u003cbr\u003eCamera Asi 2600\u003cbr\u003eFiltro Optolong Ultimate\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloading\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/a637b149e53e64b7d6e98dbf75f1c346.jpg\" alt=\"\" width=\"504\" height=\"337\" data-lazy-src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/a637b149e53e64b7d6e98dbf75f1c346.jpg\" data-ll-status=\"loading\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eReference Spectrum\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-ll-status=\"loaded\" height=\"279\" width=\"569\" alt=\"\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/affa162a0200e85a43f613d6409654fc.png\" class=\"lazyloaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e※This curve is only for reference, and is not used as the final product data.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003cimg data-ll-status=\"loaded\" height=\"80\" width=\"486\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" class=\"aligncenter lazyloaded\"\u003e\u003c\/p\u003e\n\u003ctable class=\"alignleft\" border=\"1\" cellspacing=\"2\" cellpadding=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSbustrate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e30seconds\u003c\/strong\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\u003cem\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":44430953251045,"sku":"OL-L-ULTIMATE-125","price":362.7,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":44430953283813,"sku":"OL-L-ULTIMATE-2","price":488.7,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate-astronomy-plus-1.webp?v=1690488488"},{"product_id":"optolong-l-extreme-f2-fast-optics-dual-narrowband-l-extreme-f2","title":"Optolong L-eXtreme F2 Fast Optics Dual Narrowband 2\" (L-EXTREME-F2)","description":"\u003ch1\u003eOptolong L-eXtreme F2 Fast Optics Dual Narrowband\u003c\/h1\u003e\n\u003cp\u003eOptolong L-eXtreme F2 is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterised spectral lines (OIII, Ha) as the main transmission wavelengths, the OIII and H-Alpha nebula emission lines pass accurately at f2 - f3.3 Focal Ratio. It's a product that Optolong has developed specifically for fast optical systems, or fast focal ratio imaging systems. It has performed well on RASA, HyperStar and other fast ratio telescopes.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTogether with one-shot colour astronomical cameras, monochrome astronomical cameras, and Digital SLR cameras, you can fast and quickly obtain clear and detailed images of the deep sky;\u003c\/li\u003e\n\u003cli\u003eIdeal for fast optical system, like RASA, Hyperstar and other fast focal ratio telescope users;\u003c\/li\u003e\n\u003cli\u003eRecommended for using fast optical system with focal ratio from f2 to f3.3;\u003c\/li\u003e\n\u003cli\u003eAnti-light pollution、better contrast、more details of the celestial bodies:This filter cuts out background light and noise beyond the target celestial bodies to get better details and contrast of the images. L-eXtreme F2 can effectively block light pollution so that the images will not affected by unwanted lights, and sky light of the background. You can quickly get satisfactory pictures in fast optical systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"width: 1000px;\" cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eSbustrate\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eoptical glass\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThickness\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e1.85mm\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eFWHM\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eOIII 7nm \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eHa 7nm\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eBlocking range\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e300-1000nm\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eBlocking Depth\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eSurface quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e60\/40\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTransmitted Wavefront RMS\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eλ\/4\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e Parallelism\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e30s\u003c\/span\u003e\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\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, the L-eXtreme F2 retains the prominent nebula OIII and Ha colours while blocking most of the light pollution. Specifically designed and optimally calculated for the characteristics of a fast optical system, the L-eXtreme F2 always keeps both OIII and Ha bands having high transmittance, which helps users to capture nebulae emission lines in these bands more accurately and quickly, and obtain better astrophotographic images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48076807340261,"sku":"OPT-L-EXTREME-F2-125","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":48076807307493,"sku":"OPT-L-EXTREME-F2-2","price":387.9,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-extreme-f2-fast-optics-dual-narrowband-2-l-extreme-f2-astronomy-plus-1.webp?v=1715808525"},{"product_id":"optolong-l-para-10nm-dual-narrowband-light-pollution-filter-lpar-200","title":"Optolong L-Para 10nm Dual Narrowband Light Pollution Filter (L-PARA-2)","description":"\u003ch1 class=\"title\"\u003eOptolong L-Para 10nm Dual Narrowband Light Pollution Filter\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eWhy do we make a L-Para filter with a dual band of 10nm?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn Chinese culture, the number ten symbolizes perfection in every way. An idiom in Chinese, 'shi quan shi mei' epitomizes reaching the best and most ideal state. Therefore, we aspire for the L-Para filter to achieve this standard. Specifically, it operates in dual bands, each with a width of 10nm. The repetition of the number ten signifies double wishes for your photography experiences and clear skies always. \u003c\/p\u003e\n\u003cp\u003eDuring the research phase, L-Para is dedicated to optimizing halo performance and effectively blocking out light pollution emissions. Images captured by L- Para will exhibit a dark background and precise colors. Halos around bright stars are caused by a complex optical chain. While we can't say no halo, but we believe that L-Para offers a entirely new perspective. \u003c\/p\u003e\n\u003cp\u003eAdditionally, L-Para is compatible with both fast optics and normal optics, covering focal ratios from F2 and above. One filter is designed to work with all your telescopes. L-Para, bringing you greater efficiency.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e1.  Optolong L-Para(L-Parallels)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOptolong L-Para is a brand new dual narrowband 10nm light pollution filter. The FWHM of L-Para is 10nm for OIII (500.7nm) and H-Alpha (656.3nm) respectively. The transmittance of nebulae emission lines at are both greater than 85% in system with focal ratios of F2 and above. It effectively filters out mercury lamp, sodium lamp, and LED light pollution emission lines. At the same time, it has excellent contrast and anti-halo characteristics, allowing you to capture detailed and vivid nebula images. L-Para is suitable for both normal optical systems and fast optical systems, such as RASA and Hyperstar systems. Even when light is incident at an oblique angle, it can still maintain high transmission rates to provide you with a clear and precise shooting experience.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA dual narrowband filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLight Pollution Resistance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEffectively cuts off emission lines from mercury lamps, sodium lamps, LEDs, and other light pollution sources, making it applicable to Bortle Scale1- 7 dark skies.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Transmission Rate:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, resulting in higher imaging efficiency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExcellent Contrast:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe high transmittance of nebula emission lines (OIII \u0026amp; Ha) combined with deep cut-off of light pollution bands significantly improves image contrast and detail richness.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnti-Halo Characteristics:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe design has undergone several round of optimizations and many times of repeated testing ,resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e2.Spectrum\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAccording to the characteristics of the emission lines of celestial bodies and light pollution, as well as the characteristicas of the normal telescope and fast ratio imaging system, L-Para has been maintaining high transmittance at OIII and Ha while blocking light pollution emission lines.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"592\" width=\"1034\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9b96104f725faacefa9ded926bfab8da.png?v=1736024501\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"498\" width=\"1025\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2700143340459da0e3aa3e900c9c60f4.png?v=1736024535\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"523\" width=\"1080\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ec92b95b51a57afdfb563adfcf710c88.png?v=1736024560\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cp\u003e2\"（M48×0.75） \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOuter Box: silve box\u003c\/li\u003e\n\u003cli\u003ePlastic Box: PP material\u003c\/li\u003e\n\u003cli\u003eLining: imported high pressure white EVA material\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46422525214949,"sku":"OPT-L-PARA-2","price":324.9,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_97fac2b9-20cb-4b5b-bc95-eb4f7dc3cee3.png?v=1777045161"},{"product_id":"optolong-l1-l-quad-l-para-enhence-filter-set-l1","title":"Optolong L1 L-Quad \u0026 L-Para Enhence Filter Set (L1-SET)","description":"\u003ch1\u003eOptolong L1 L-Quad \u0026amp; L-Para Enhence Filter Set\u003c\/h1\u003e\n\u003cp\u003eL1 Dual -Combo Set includes：one L-Quad Enhance Filter and one L-Para L-Quad Enhance Filter：Quad bandpass broadband filter , This filter provides better color balance while improving resistance of light pollution. It is suitable for a wide range of imaging targets, including continuous spectrum objects (RGB) such as nebulae, galaxies, and star clusters. This filter maximizes the preservation of RGB color balance in broadband spectrum targets like nebulae and galaxies, effectively improving con \u003c\/p\u003e\n\u003ch2\u003e\u003ca rel=\"noopener\" href=\"https:\/\/astronomyplus.com\/products\/optolong-l-enhance-filter?_pos=4\u0026amp;_sid=08b680de8\u0026amp;_ss=r\" target=\"_blank\"\u003eL-Quad Enhance Filter\u003c\/a\u003e\u003c\/h2\u003e\n\u003cp\u003eQuad bandpass broadband filter ,  This filter provides better color balance while improving resistance of light pollution. It is suitable for a wide range of imaging targets, including continuous spectrum objects (RGB) such as nebulae, galaxies, and star clusters. This filter maximizes the preservation of RGB color balance in broadband spectrum targets like nebulae and galaxies, effectively improving contrast and detail to render subjects more vivid and three-dimensional.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/dbeae9d38c40e5c4742bd4ce3bc3eddf_1024x1024.jpg?v=1758301649\"\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003ca href=\"https:\/\/astronomyplus.com\/products\/optolong-l-para-10nm-dual-narrowband-light-pollution-filter-lpar-200?_pos=2\u0026amp;_sid=08b680de8\u0026amp;_ss=r\" rel=\"noopener\" target=\"_blank\"\u003eL-Para\u003c\/a\u003e\u003c\/h2\u003e\n\u003cp\u003eA dual narrowband 10nm filter  ,in systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, with excellent contrast and Anti-Halo characteristics . This filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes. Ideal for capturing Hα \u0026amp; OIII signals in celestial objects, this filter enhances image contrast and reveals richer details in Hα \u0026amp; OIII emissions.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9b96104f725faacefa9ded926bfab8da_70c51161-6868-41ef-89ce-6603d4232bf9_1024x1024.png?v=1758301713\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2700143340459da0e3aa3e900c9c60f4_d78ac1cf-a484-4232-ab8c-af8e272a4efa_1024x1024.png?v=1758301754\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ec92b95b51a57afdfb563adfcf710c88_5fb714e0-720c-485c-a1cc-0fc1cb431ece_1024x1024.png?v=1758301769\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003ch2\u003e1+1\u0026gt;2 features\u003c\/h2\u003e\n\u003cp\u003e“Broadband + Narrowband” synergy engineered for precision and colour fidelity,achieves precise signal capture and color optimization for astrophotography\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eL-Quad Enhance Filter:\u003c\/strong\u003e\u003c\/span\u003e Quad bandpass broadband filter captures the RGB signals of celestial targets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eL-Para :\u003c\/strong\u003e\u003c\/span\u003e Dual narrowband 10nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionised gas in deep-sky objects. After post-processing,photographers can effortlessly obtain fused images combining RGB with Hα \u0026amp; OIII data. This \"Broadband-Narrowband Synergy\" solution delivers more vibrant color rendition while accentuating subtle signal details, unlocking innovative approaches for astrophotography and enhancing the creative possibilities of color camera imaging. It pioneers new artistic dimensions, transforming the deep-sky photography process into a more technically engaging and visually rewarding experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCoating Technology\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch2\u003eL-Quad Enhance 2\"\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission (Tpeak)\u003c\/td\u003e\n\u003ctd\u003eT \u0026gt; 90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300 – 1000 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eLight pollution line blocking \u0026gt; 99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront (RMS)\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/dbeae9d38c40e5c4742bd4ce3bc3eddf_1024x1024.jpg?v=1758301649\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eL-Para 2\"\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eInfo\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBroad Compatibility\u003c\/td\u003e\n\u003ctd\u003eWorks with all telescope systems, including fast optics (F2–F4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Pollution Resistance\u003c\/td\u003e\n\u003ctd\u003eBlocks mercury, sodium, LED lines; effective under Bortle 1–7 skies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Transmission Rate\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;85% for OIII \u0026amp; Hα (at F2 and above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcellent Contrast\u003c\/td\u003e\n\u003ctd\u003eHigh nebula transmission + strong light pollution cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnti-Halo Characteristics\u003c\/td\u003e\n\u003ctd\u003eOptimized design, tested for improved anti-halo on bright stars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9b96104f725faacefa9ded926bfab8da_70c51161-6868-41ef-89ce-6603d4232bf9_1024x1024.png?v=1758301713\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2700143340459da0e3aa3e900c9c60f4_d78ac1cf-a484-4232-ab8c-af8e272a4efa_1024x1024.png?v=1758301754\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ec92b95b51a57afdfb563adfcf710c88_5fb714e0-720c-485c-a1cc-0fc1cb431ece_1024x1024.png?v=1758301769\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003ctable style=\"width: 100.044%; height: 78.4px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"width: 40.0348%; height: 39.2px;\"\u003eThe Major Emission Lines of Nebulae\u003c\/th\u003e\n\u003cth style=\"width: 56.8783%; height: 39.2px;\"\u003eThe Major Emission Lines of Artificial Light Pollution\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 40.0348%; height: 19.6px;\"\u003eH-α 656.3 nm  H-β 486.1 nm\u003c\/td\u003e\n\u003ctd style=\"width: 56.8783%; height: 19.6px;\"\u003eHg 435.8 nm  546.1 nm  577 nm  578.1 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 40.0348%; height: 19.6px;\"\u003eOIII 495.9 nm  OIII 500.7 nm\u003c\/td\u003e\n\u003ctd style=\"width: 56.8783%; height: 19.6px;\"\u003eNa 598 nm  589.6 nm  615.4 nm  616.1 nm\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\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-Quad Enhence Filter - 2\"\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-Para Filter - 2\"\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47759264579813,"sku":"OPT-L1-SET","price":501.3,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Optolong-L1-Dual-Combo-Set_1200x1200_9dc91923-6a0e-4cd2-ae46-30fb0d90f7fb.webp?v=1758302755"},{"product_id":"optolong-dual-narrow-band-filter","title":"Optolong 2\" L-Synergy 7nm Dual NarrowBand Filter (L-SYNERGY)","description":"\u003ch1\u003eOptolong 2\" L-Synergy 7nm Dual NarrowBand Filter (SII and OIII) \u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter years of technical refinement, it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy's advantage lies in its selective transmission of only the nebula emission lines OIII (500.7nm) and SII (672.4nm), while blocking all other light-polluting emission lines. This ensures that only the signals from oxygen and sulfur elements are captured during imaging, resulting in a darker sky background and significantly enhanced contrast and signal-to-noise ratio (SNR) between nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEven in heavily light-polluted areas, this filter selectively transmits nebula emission lines while filtering out light pollution, ultimately eliminating its impact on astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy analyzing the spectral characteristics of both celestial emission lines and light pollution, L-Synergy selectively preserves the SII and OIII nebula colors while filtering out the majority of light pollution. Specifically designed and optically optimized, L-Synergy maintains consistently high transmission across both SII and OIII bands. This ensures users can precisely capture the target nebula emissions, delivering optimal astrophotography results.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_6c99d215-26fa-4dec-97c7-8587f8169a0d.png?v=1759336984\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_260beffd-fac7-43c0-bb8f-39371fce8576.jpg?v=1759337078\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_96f41837-73c5-433f-bd12-d0b744ffe11b.jpg?v=1759337244\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-Synergy Filter Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eI. WR134 in the Cygnus constellation © Gianni Lacroce\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest with the new Optolong L-sinergy filter, a 7nm S2 O3 dual-band filter, and \u003cu\u003eI have to say I really liked it.\u003c\/u\u003e\u003cbr\u003eI chose to photograph WR134 in the constellation Cygnus.\u003cbr\u003eHaving shot in monochrome, which usually results in a significant amount of signal with an H-alpha filter, the O3 is there, but sometimes I have to integrate a lot to bring it out; the S2 isn't there at all. So I thought, ‘There won't be all that much signal; to take a decent photo, I'll have to integrate a lot,’ and that's why I took 200 5-minute shots.\u003cbr\u003eOnce I'd processed the photo, I found it came out of the WBPP \u003cu\u003ewithout gradients or halos\u003c\/u\u003e, but above all, bicolour, meaning full of S2 and lots and lots of O3, and I find this wonderful. I didn't have to do anything else in processing except stretch the image, balance contrast, highlights, and tones to customise it a bit, but in the end, it was already like this in the raw file.\u003cbr\u003e\u003cu\u003eThis filter greatly simplifies post-production.\u003c\/u\u003e\u003cbr\u003eI'll also show you the Starless Nebula to help you understand the signal and the O3 it produces.\u003cbr\u003eMore shots of this new filter will follow soon.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eEQUIPMENT\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eImaging Telescope: Newton Tecnosky Carbon 200\u003cbr\u003eImaing CameraZwo Asi 2600 duo  \u003cbr\u003eMount: Zwo Am5\u003cbr\u003eOptolong \u003cu\u003e\u003cstrong\u003eL-Synergy\u003c\/strong\u003e\u003c\/u\u003e filters\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003ePHOTOS\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003etemp 0 with dark, flat and darkflat\u003cbr\u003e200 x 300s  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePROCESSING\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePixinsight\u003cbr\u003ePhotoshop\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_152b9ecb-fc58-47ca-a2fb-7e7df52da8a3.jpg?v=1759337273\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5_4c31f387-a3f9-431b-858c-0e46f3b60fd1.jpg?v=1759337308\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e2\"（M48×0.75）\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: start;\"\u003eIn the box\u003c\/h3\u003e\n\u003cp\u003eOptolong L-Synergy dual-narrow band filter (SII and OIII)\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47797222342885,"sku":"OPT-L-SYNERGY","price":387.9,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/S1_b7cee943-c691-408d-b79e-b5b5febe8a96.jpg?v=1777043771"},{"product_id":"optolong-l2-dual-combo-set-l-extreme-l-synergy-2","title":"Optolong L2 Dual-Combo Set (L-eXtreme\u0026L-Synergy) (2\")","description":"\u003ch1\u003eOptolong L2 Dual-Combo Set (L-eXtreme\u0026amp;L-Synergy)\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL2 Dual-Combo Set includes two premium filters: one L-eXtreme and one L-Synergy.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-eXtreme:The L-eXtreme is a dual-narrowband filter (OIII-7nm \u0026amp; Ha-7nm) designed to exclusively transmit the key nebula emission lines of OIII (500.7nm) and Hα (656.3nm). By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and Hα elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-Synergy：The L-Synergy is a dual-narrowband filter (OIII-7nm \u0026amp; SII-7nm) that guarantees high transmission for both the SII (672.4nm) and OIII (500.7nm) spectral lines, while offering exceptional out-of-band rejection for all other wavelengths. By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and SII elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e1.  Why is L2 Dual-Combo Set?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThe L2 Dual-Combo Set is engineered to unleash the power of Hubble Palette imaging for color camera users, supporting telescope systems as fast as F3.3, and above ( slower system).\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTailored specifically for color camera astrophotographers, this set includes two premium filters: OIII \u0026amp; Hα (L-eXtreme),OIII \u0026amp; SII (L-Synergy).\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThis innovative combination breaks through the traditional limitations of narrowband imaging with color cameras. Without the need to switch to a monochrome camera or invest in an expensive SHO three-filter set, users can achieve stunning Hubble Palette images at a fraction of the cost and complexity.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThe core appeal of this combination design lies in lowering barriers and expanding possibilities for colour camera users: it preserves the equipment advantages of colour cameras while enabling users to unlock “Hubble-like” creative capabilities at minimal cost through minimalist filter combination. Simultaneously, it offers greater flexibility for astrophotography.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eWhether capturing nebular detail or reproducing deep-sky colours, this combination enables richer creative expression, truly unlocking the full potential of colour cameras in deep-sky photography.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e2.Optical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eBased on the characteristics of celestial emission lines and light pollution emission lines, the L2 Dual-Combo Set preserves the distinctive colours of nebulae in OIII, Hα, and SII while filtering out the vast majority of light pollution. Specifically designed and optically optimized, its transmission profile is as follows:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cimg style=\"height: 371px; width: 800px;\" src=\"https:\/\/optolong.com\/uploads\/images\/20250924\/19ce3d5664886f96373832d4be8e8830.png\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: left;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTechnical Specifications\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\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=\"17\" align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eParameter\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eValue\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eProduct Name\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L2 Dual-Combo Set\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eFilter Count\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2 filters\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIncluded Filter 1\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-eXtreme\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIncluded Filter 2\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-Synergy\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-eXtreme Passbands\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOIII 500.7 nm, Hα 656.3 nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-Synergy Passbands\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOIII 500.7 nm, SII 672.4 nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eBandwidth (FWHM)\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e7 nm (all passbands)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eSupported Telescope Speed\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ef\/3.3 and slower\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Type\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eMulti-layer anti-reflection\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"77\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eSubstrate Coating Type\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eNon-cementing optical substrate coating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Technology\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIon-assisted deposition (IAD)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"62\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCWL Stability\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eNo deviation with temperature change\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Uniformity Method\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ePlanetary rotation system\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eThread Specification\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eM48 × 0.75\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eFilter Size\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eInner Plastic Box Material\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ePP\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eLining Material\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eHigh-pressure black EVA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"text-align: left;\"\u003e\n\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003ch3\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eIn the Box\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L-eXtreme (2\")\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L-Synergy (2\")\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e\u003cbr\u003e\u003cbr\u003eWarranty\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/optolong-warranty\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong 3-Year Warranty\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":48076794396901,"sku":"OPT-L2-2","price":715.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/625ce0ff357eae9d0cd02396e639a230.jpg?v=1777043812"}],"url":"https:\/\/astronomyplus.com\/collections\/optolong-summer-sale.oembed","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}