{"title":"William Optics Deals","description":"\u003cp\u003eDiscover our William Optics deals at Astronomy Plus. Whether you enjoy astrophotography or visual observing, save on a selection of William Optics telescopes and accessories.\u003c\/p\u003e","products":[{"product_id":"william-optics-0-8x-flattener-reducer-p-flat6aiii","title":"William Optics 0.8x Flattener\/Reducer (P-FLAT6AIII)","description":"\u003ch1\u003eWilliam Optics 0.8x Flattener\/Reducer Flat6AIII\u003c\/h1\u003e\n\u003cdiv class=\"rte product-single__description\"\u003e\n\u003cdiv id=\"tabs\" class=\"description ui-tabs ui-widget ui-widget-content ui-corner-all\"\u003e\n\u003cdiv id=\"tabs-2\" class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003eThis William Optics 0.8x Flattener\/Reducer has been designed to optimize the flat-field imaging performance of William Optics GT71, GT81, Z81 \u0026amp; Z103 refactors. The APO triplet optics of the Field Flattener and Reducer was made with Ohara glass and fully multi-coated to provide good illumination and a beautifully flat field across 97% of full frame sensors.\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003eThe reducing factor is 0.8X. Designed with M63 threads on the telescope side, the Field Flattener and Reducer will thread directly into the telescope. Just remove the three screws on the focuser adapter, take off the adapter, and thread the focal reducer\/field flattener on in it's stead. The Field Flattener and Reducer has 2\" threads on the opposite side to accept a 48mm (Wide) T ring for your DSLR. There is even a slot behind the 2\" threads to accept an M48 filter.\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003eThe Field Flattener and Reducer is adjustable to help you achieve the proper back focus. Adjustment distances \u0026amp; back focus, as well as the image circle measurement for each of the telescopes are listed below.\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\" role=\"tabpanel\" aria-labelledby=\"ui-id-1\" aria-expanded=\"true\" aria-hidden=\"false\"\u003e\n\u003cstrong\u003eFull frame size\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned with nearly Full frame chip-size DSLR cameras in mind.\u003c\/li\u003e\n\u003cli\u003eFMC tripllet APO design.\u003c\/li\u003e\n\u003cli\u003eProduced entirely with the best Ohara optical glasses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eAmazing\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eReducing factor 0.8X.\u003c\/li\u003e\n\u003cli\u003eAdjustable design, for perfect back focus it can be used with other models of refractor\u003c\/li\u003e\n\u003cli\u003e48mm filter ready.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eEasy to Use\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eWill accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eSuitable for\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eNewer GT71, GT81, Z81, Z103 scopes that have a female M63 thread. Therefore, check your telescope before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eAmount of adjustment:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eGT71 - 9.1 mm\u003c\/li\u003e\n\u003cli\u003eGT81 - 7.1 mm\u003c\/li\u003e\n\u003cli\u003eZ103 - 2.5 mm\u003c\/li\u003e\n\u003cli\u003eZ81 - 5.2 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eGT71 - 64.1 mm\u003c\/li\u003e\n\u003cli\u003eGT81 - 62.1 mm\u003c\/li\u003e\n\u003cli\u003eZ103 - 57.5 mm\u003c\/li\u003e\n\u003cli\u003eZ81 - 60.2 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eImage Circle:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eGT71 - 44.4 mm\u003c\/li\u003e\n\u003cli\u003eGT81 - 44.4 mm\u003c\/li\u003e\n\u003cli\u003eZ103 - 43.1 mm\u003c\/li\u003e\n\u003cli\u003eZ81 - 44.3 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_fe12959c-6db5-4ad5-b727-b889e1b72222.png?v=1707419826\" width=\"641\" height=\"641\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_f3e77618-e752-433d-ab2b-c224b15c0f99.png?v=1707419846\"\u003e\u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_a2a0d476-0328-4856-8db6-315e9e23810c.png?v=1707419871\" width=\"646\" height=\"646\"\u003e\u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003ctable style=\"box-sizing: border-box; border-color: #ececec; border-spacing: 0px; margin-bottom: 1em; width: 1050px; color: #777777; font-family: 'Roboto Condensed', sans-serif; font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\n\u003ctbody style=\"box-sizing: border-box;\"\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eTelescope Side Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eM63x1 Thread- Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eCamera Side Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eM48x0.75 Thread- Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eBack Focus\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eGT71: 64.1mm\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eGT81: 62.1mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ81: 60.2mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ103: 57.5mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eImage Circle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eGT71: 44.4mm\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eGT81: 44.4mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ81: 44.3mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ103: 43.1mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eWilliam Optics 0.8x Reducer\/Flattener\u003cbr data-mce-fragment=\"1\"\u003e\n\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\"\u003eWilliam Optics 2-Year Warranty\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":43125779300581,"sku":"WO-P-FLAT6AIII","price":250.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/william-optics-0-8x-flattenerreducer-p-flat6aiii-astronomy-plus-1.webp?v=1690485722"},{"product_id":"william-optics-new-internal-focus-design-gran-turismo-81-wifd-gt81-wifd","title":"William Optics NEW Internal Focus Design Gran Turismo 81 WIFD + Flattener + Guide Scope (GT81-WIFD-AP)","description":"\u003ch1 class=\"productView-title\"\u003eWilliam Optics GT81 Internal Focus Design WIFD Apochromatic Series\u003c\/h1\u003e\n\u003cdiv role=\"tabpanel\" class=\"data item content\" id=\"description\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003ch2 class=\"hero__heading\"\u003e\u003cstrong\u003eTHE NEW GAME CHANGER\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003eIntroducing the WILLIAM OPTICS Internal Focus Design (WIFD) Apochromatic Series. This innovative and revolutionary design combines a precision (Patented) internal focusing mechanism with the highest quality optics available, providing the ultimate Apochromatic refractor for astrophotography. Designed from the ground up with the ability to handle the newest generation of large, heavy, high-resolution cooled cameras, the rock-solid optical tube assembly is uncompromised in quality. The movement of the focuser is integrated inside the main tube assembly, so there are no movements of a focuser drawtube visible from the outside.  The user can enjoy the benefits of a traditional two speed fine focuser, while not worrying about limitations typically found in traditional rear mounted focusers. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/thenewwifd_480x480.png?v=1675873568\" alt=\"\" width=\"615\" height=\"260\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDfocuserdesign_480x480.png?v=1675873667\" alt=\"\" width=\"549\" height=\"263\"\u003e\u003c\/p\u003e\n\u003ch2\u003eINTERNAL FOCUSER DESIGN\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eNEW internal focuser.  Our new design includes the Patented WO center focuser with precise internal sliding of fixed optics to prevent image shift.  The integrated position viewing window on the focuser provides instant verification of the graduated numerical display.  The smooth rack and pinion design is incorporated into the focuser to provide super fine adjustability for critical focus.  The internal movement of the optical elements is protected from the elements and can’t come out of alignment.  The redistribution of weight allows for better balance during imaging sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDFOCUSER_480x480.gif?v=1675873830\" alt=\"\" width=\"627\" height=\"419\"\u003e\u003c\/p\u003e\n\u003ch2\u003eDESIGN PRINCIPLE\u003c\/h2\u003e\n\u003cp\u003eScalable Design.  The WIFD series will allow for many sizes and is not limited to smaller refractors.   Additional optical designs are possible to meet various photographic requirements enhancing the line to include a number of apertures and fast focal ratios.\u003cbr\u003e\u003cbr\u003eInspired by the tremendous success of the WO CAT series of astrographs, William Optics has advanced the capabilities of astrophotography to the next level with this “no weight limit on photo accessories” design.  The solid tube where accessories are attached, has a rigid design, and will not flex or exhibit any change in the optical path regardless of the weight of the camera and filter wheel attached to it.\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDdesign_480x480.png?v=1675873934\" alt=\"\" width=\"640\" height=\"304\"\u003e\u003c\/p\u003e\n\u003ch2\u003eCAT DESIGN\u003c\/h2\u003e\n\u003cp\u003eImproved “CAT” design ring tubes and dovetail base are lighter while remaining equally rigid. The new design allows for better balance with heavy accessories, and has integral placement of the focuser knobs, providing easy access to focusing during imaging.  Included is the popular WO Saddle Bar Handle, critical for rigid guidescope mounting and autoguiding performance.\u003cbr\u003e\u003cbr\u003eSuper Smooth Field Rotator.  Our field rotator design features smooth camera rotation with markings for degrees and a locking thumbscrew to prevent accidental camera movement,also new Electric Rotator will be available in near future.\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDcatdesign_480x480.png?v=1675874349\" alt=\"\" width=\"620\" height=\"292\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003eZYGO TEST REPORT\u003c\/h2\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDtestreport_480x480.png?v=1675874553\" alt=\"\" style=\"float: left;\" width=\"560\" height=\"344\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0px; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDSEIGN2_480x480.png?v=1675874930\" alt=\"\" width=\"597\" height=\"302\"\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"definition\"\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eLens Type :\u003c\/strong\u003e Triplet Apochromatic Prime Lens\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eFocal Length : \u003c\/strong\u003e478mm\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eDiameter: \u003c\/strong\u003e81mm\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eF\/ Ratio :\u003c\/strong\u003e f\/5.9\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eOptional Flattener : \u003c\/strong\u003eFLAT6AIII 0.8x \/ FLAT68III 1.0X\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eFocuser :\u003c\/strong\u003e WIFD \/ Compatible with EAF\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eColor :\u003c\/strong\u003e Red\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eLens Material : \u003c\/strong\u003eFPL-53\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eStrehl Ratio :\u003c\/strong\u003e 0.95+\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eCamera Format : \u003c\/strong\u003eFull Frame \/ DSLR \/ Mirrorless \/ CMOS \/ CCD\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eTest Report :\u003c\/strong\u003e Included\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eT-Mounts Supported\u003c\/strong\u003e \u003cstrong\u003e: \u003c\/strong\u003eCanon EF, RF \/ Nikon F, Z \/ Sony E \/ Pentax K \/ Micro Four Thirds (M4\/3) \/ FUJI X\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWilliam Optics WIFD Gran Turismo 81\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTest Report\u003c\/li\u003e\n\u003cli\u003eCarrying Bag\u003c\/li\u003e\n\u003cli\u003eFlattener\u003c\/li\u003e\n\u003cli\u003eGuide scope\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePlease Note : Rotolock and Flattener are optional Not Included\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/william-optics-warranty\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/william-optics-f-a-q\" target=\"_blank\"\u003eWilliam Optics F.A.Q\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tab\" class=\"data item title\" id=\"tab-label-additional\" tabindex=\"0\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":46363602747621,"sku":"WO-T-GT-81RD-WIFD","price":2850.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/GT-81-WIFD-perspective-11.webp?v=1777048010"},{"product_id":"william-optics-super-high-precision-copper-t-mount-for-nikon-full-frame-ye-tr-br48-n","title":"William Optics Super high precision COPPER T-mount for Nikon full frame (YE-TR-BR48-N)","description":"\u003ch2 class=\"page-title\" data-mce-fragment=\"1\"\u003e\u003cspan class=\"base\" data-ui-id=\"page-title-wrapper\" data-mce-fragment=\"1\" itemprop=\"name\"\u003eSuper high precision COPPER T-mount for Nikon full frame \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eT-mount for Nikon full-frame camera copper version. Made from high quality copper material, hard coated and CNC machine processed. This t-mount will fit your scope and camera without any gap, no image shift.\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eSuper high precision COPPER T-mount for Nikon full frame \u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWilliam Optics 2-Year Warranty\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44181527331045,"sku":"WO-YE-TR-BR48-N","price":70.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/william-optics-super-high-precision-copper-t-mount-for-nikon-full-frame-ye-tr-br48-n-astronomy-plus-1.png?v=1715808946"},{"product_id":"william-optics-gran-turismo-81-iv-triplet-apo-f-5-9-used-f81gtivrd-u","title":"William Optics Gran Turismo 81 IV Triplet APO f\/5.9 + Reducer - USED (F81GTIVRD-U)","description":"\u003ch1\u003eWilliam Optics Gran Turismo 81 IV Triplet APO f\/5.9 - USED\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan style=\"color: #fc0404;\"\u003e\u003cstrong\u003eThis telescope is in really good condition. Please note that no Dovetail is included. Comes with a diagonal and Flattener, in excellent condition.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Gran Turismo 81 IV Triplet APO f\/5.9 has been designed to deliver excellent color correction and sharpness due to its triplet APO optics. It features an 81 mm aperture, 472 mm focal length, and f\/5.9 F-ratio for enhanced clarity and brightness. This optical system is capable of capturing stunning widefield images that are free from chromatic aberrations.\u003c\/p\u003e\n\u003ch2\u003eWilliam Optics 0.8x Flattener\/Reducer - USED\u003c\/h2\u003e\n\u003cdiv class=\"rte product-single__description\"\u003e\n\u003cdiv class=\"description ui-tabs ui-widget ui-widget-content ui-corner-all\"\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003eThis William Optics 0.8x Flattener\/Reducer has been designed to optimize the flat-field imaging performance of William Optics GT71, GT81, Z81 \u0026amp; Z103 refactors. The APO triplet optics of the Field Flattener and Reducer was made with Ohara glass and fully multi-coated to provide good illumination and a beautifully flat field across 97% of full frame sensors.\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003eThe reducing factor is 0.8X. Designed with M63 threads on the telescope side, the Field Flattener and Reducer will thread directly into the telescope. Just remove the three screws on the focuser adapter, take off the adapter, and thread the focal reducer\/field flattener on in it's stead. The Field Flattener and Reducer has 2\" threads on the opposite side to accept a 48mm (Wide) T ring for your DSLR. There is even a slot behind the 2\" threads to accept an M48 filter.\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\n\u003cdiv class=\"rte product-single__description\"\u003e\n\u003cdiv class=\"description ui-tabs ui-widget ui-widget-content ui-corner-all\"\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003eThe Field Flattener and Reducer is adjustable to help you achieve the proper back focus. Adjustment distances \u0026amp; back focus, as well as the image circle measurement for each of the telescopes are listed below.\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ui-tabs-panel ui-widget-content ui-corner-bottom\"\u003e\n\u003cstrong\u003eFull frame size\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned with nearly Full frame chip-size DSLR cameras in mind.\u003c\/li\u003e\n\u003cli\u003eFMC tripllet APO design.\u003c\/li\u003e\n\u003cli\u003eProduced entirely with the best Ohara optical glasses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eAmazing\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eReducing factor 0.8X.\u003c\/li\u003e\n\u003cli\u003eAdjustable design, for perfect back focus it can be used with other models of refractor\u003c\/li\u003e\n\u003cli\u003e48mm filter ready.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eEasy to Use\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eWill accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eSuitable for\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eNewer GT71, GT81, Z81, Z103 scopes that have a female M63 thread. Therefore, check your telescope before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eAmount of adjustment:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eGT71 - 9.1 mm\u003c\/li\u003e\n\u003cli\u003eGT81 - 7.1 mm\u003c\/li\u003e\n\u003cli\u003eZ103 - 2.5 mm\u003c\/li\u003e\n\u003cli\u003eZ81 - 5.2 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eGT71 - 64.1 mm\u003c\/li\u003e\n\u003cli\u003eGT81 - 62.1 mm\u003c\/li\u003e\n\u003cli\u003eZ103 - 57.5 mm\u003c\/li\u003e\n\u003cli\u003eZ81 - 60.2 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eImage Circle:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eGT71 - 44.4 mm\u003c\/li\u003e\n\u003cli\u003eGT81 - 44.4 mm\u003c\/li\u003e\n\u003cli\u003eZ103 - 43.1 mm\u003c\/li\u003e\n\u003cli\u003eZ81 - 44.3 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003ePhotos Taken with the Telescope :\u003c\/h4\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/M33_TriangulumGalaxy_-2024-09-04-25x300s_2.1h--10CGT81IVASI2600MCLExtr-Astrowizard.jpg?v=1792678944\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/M31_AndromedaGalaxy_-2024-09-04-29x300s_2.4h--10C-GT81IVASI2600MC-Astrowizard.jpg?v=1792678941\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"641\" width=\"641\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_fe12959c-6db5-4ad5-b727-b889e1b72222.png?v=1707419826\" alt=\"\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_f3e77618-e752-433d-ab2b-c224b15c0f99.png?v=1707419846\" alt=\"\"\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cimg height=\"646\" width=\"646\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_a2a0d476-0328-4856-8db6-315e9e23810c.png?v=1707419871\" alt=\"\"\u003e\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ctable style=\"box-sizing: border-box; border-color: #ececec; border-spacing: 0px; margin-bottom: 1em; width: 1050px; color: #777777; font-family: 'Roboto Condensed', sans-serif; font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\n\u003ctbody style=\"box-sizing: border-box;\"\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eAperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e81mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eFocal Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e478mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eFocal Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003ef\/5.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eCamera Format\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eAPS-C, Full Frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eFocuser\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e2.5″ R\u0026amp;P focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eImage Circle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e\u0026gt;Full Frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eRecommended Flattener\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eFLAT6AIII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eTube Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e380mm (Fully Retracted)\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003e450mm (Fully Extended)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eTube Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e3.95kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e0.8x Reducer Flattener Specification\u003c\/h2\u003e\n\u003ctable style=\"box-sizing: border-box; border-color: #ececec; border-spacing: 0px; margin-bottom: 1em; width: 1050px; color: #777777; font-family: 'Roboto Condensed', sans-serif; font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\n\u003ctbody style=\"box-sizing: border-box;\"\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eTelescope Side Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eM63x1 Thread- Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eCamera Side Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eM48x0.75 Thread- Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eBack Focus\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eGT71: 64.1mm\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eGT81: 62.1mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ81: 60.2mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ103: 57.5mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eImage Circle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eGT71: 44.4mm\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eGT81: 44.4mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ81: 44.3mm\u003c\/p\u003e\n\u003cp style=\"box-sizing: border-box; margin: 0.5em 0px; overflow-wrap: break-word;\"\u003eZ103: 43.1mm\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\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWilliam Optics Gran Turismo 81 IV - USED\u003c\/li\u003e\n\u003cli\u003eBahtinov Mask\u003c\/li\u003e\n\u003cli\u003eRings\u003c\/li\u003e\n\u003cli\u003eSlide-Base Handle\u003c\/li\u003e\n\u003cli\u003e50mm William Optics Guide scope, Uni-guide\u003c\/li\u003e\n\u003cli\u003eSoft Carrying Case with customized foam\u003c\/li\u003e\n\u003cli\u003e2'' William Optics Star diagonal\u003c\/li\u003e\n\u003cli\u003e0.8x Flattener Reducer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNo dovetail included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/astronomyplus.com\/pages\/william-optics-warranty\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/astronomyplus.com\/pages\/william-optics-f-a-q\" target=\"_blank\"\u003eWilliam Optics F.A.Q\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":46750504845541,"sku":"WO-F81GTIVRD-HAL","price":1000.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/IMG_20250510_152936_881.jpg?v=1777043666"},{"product_id":"william-optics-flat61-for-zenithstar-61-used-p-flat61a-u","title":"William Optics Flat61 for ZenithStar 61 - USED (P-FLAT61A-U)","description":"\u003ch1\u003eWilliam Optics Flat61 for ZenithStar 61 - USED\u003c\/h1\u003e\n\u003cp\u003eThis flattener is for ZenithStar 61.\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"box-sizing: border-box; border-color: #ececec; border-spacing: 0px; margin-bottom: 1em; width: 1050px; color: #777777; font-family: 'Roboto Condensed', sans-serif; font-size: medium; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; 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;\"\u003e\n\u003ctbody style=\"box-sizing: border-box;\"\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eTelescope Side Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eM54x0.75 Thread- Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eCamera Side Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003eM48x0.75 Thread- Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eBack Focus\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e67.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eImage Circle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e\u0026gt;Full Frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0.5em 0.5em 0px; text-align: left; color: #666666;\"\u003e\u003cstrong style=\"box-sizing: border-box; font-weight: bolder;\"\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; border-bottom: 1px solid #ececec; font-size: 0.9em; line-height: 1.3; padding: 0.5em 0px 0.5em 0.5em; text-align: left; color: #666666;\"\u003e0.32kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWilliam Optics Flat61 for Z61\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48305224483045,"sku":"WO-P-FLAT61A-POIR","price":230.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/20260121_150611.jpg?v=1777043850"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/collections\/William_Optics___refracteur_rouge_et_SpaceCat_gris.png?v=1793128156","url":"https:\/\/astronomyplus.com\/collections\/william-optics-deals.oembed","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}