{"product_id":"william-optics-wifd-ultra-cat-76-f-4-8-apo-t-c-76","title":"William Optics WIFD Ultra-Cat 76 f\/4.8 APO (T-C-76)","description":"\u003ch1\u003eWilliam Optics WIFD Ultra-Cat 76 f\/4.8 APO \u003c\/h1\u003e\n\u003cp\u003eThe William Optics Ultra-Cat 76 is a powerful astrograph designed for capturing stunning deep-space images. Its fast f\/4.8 focal ratio, achieved with a 76 mm aperture and 365 mm focal length, makes it ideal for wide-field astrophotography. Built with 5 precision-crafted lens elements, this Petzval refractor delivers sharp, well-corrected images across the entire field, eliminating the need for a field flattener or backspace adjustments.\u003c\/p\u003e\n\u003cp\u003eIts large 50 mm image circle easily accommodates medium-format and full-frame cameras, while the William Optics Internal Focus Design (WIFD) ensures smooth and stable focusing. For added convenience, it’s also compatible with an optional electronic autofocuser, making it a versatile and efficient tool for astrophotographers seeking high-quality results.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced 5-Element Petzval Design\u003cbr\u003e\u003c\/strong\u003eEliminates field curvature, providing sharp, flat-field images without requiring additional flatteners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eF\/4.8 Fast Optics\u003cbr\u003e\u003c\/strong\u003eOffers exceptional light-gathering capability for vibrant deep-sky photography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWIFD (William’s Internal Focuser Design)\u003cbr\u003e\u003c\/strong\u003ePatented internal focuser ensures precise, stable, and hassle-free imaging, avoiding balance issues and eliminating vignetting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnti-Shrink Lens Cell Technology\u003cbr\u003e\u003c\/strong\u003eMinimizes thermal expansion and contraction, maintaining perfect optical alignment in any environment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor Tilt Corrector\u003cbr\u003e\u003c\/strong\u003eIntegrated and patented design eliminates distortion, optimizing sharpness and detail for professional-level results.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt-In Patented Bahtinov Mask\u003cbr\u003e\u003c\/strong\u003eSimplifies focusing for pinpoint precision, a feature that sets it apart from competitors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePatented Handle Bar Design\u003cbr\u003e\u003c\/strong\u003eCombines ergonomic usability with enhanced portability.\u003c\/p\u003e\n\u003ch2 class=\"h1\"\u003eSTX-A Smarter, More Efficient Tilt Adjustment System\u003c\/h2\u003e\n\u003cp\u003eThe Ultra-Cat 76 comes equipped with \u003cspan class=\"il\"\u003eWilliam\u003c\/span\u003e Optics' new Sensor Tilt Xterminator (STX) technology, ensuring precise sensor alignment and eliminating tilt issues for optimal astrophotography results.\u003c\/p\u003e\n\u003cp data-start=\"455\" data-end=\"850\"\u003eThe STX builds upon the foundation of traditional sensor tilt adjusters, offering a streamlined and intuitive design that eliminates the need for cumbersome disassembly. Unlike conventional systems that require camera removal for tilt correction, the STX allows adjustments to be made directly from the side of the assembly, significantly reducing setup time and enhancing ease of use.\u003c\/p\u003e\n\u003cp data-start=\"852\" data-end=\"1402\"\u003eBy refining the original 4 pull-in and 8 push-out screw configuration into a more efficient 4 push-out and 4 locked screw system, the STX enables precise and controlled adjustments. Operating like a seesaw mechanism, the system allows for effortless corrections—simply loosen one screw and tighten the opposite diagonal screw to achieve fine tilt alignment. This ensures that astrophotographers can make on-the-fly refinements without disrupting their imaging workflow, maintaining pinpoint star performance across the entire frame.\u003c\/p\u003e\n\u003ch2\u003eDiagram Report\u003c\/h2\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\/Diagram_UltraCat-76_SD_1024x1024.webp?v=1742489585\"\u003e\u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"85\" span=\"2\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eLens Type\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e5-Element Advanced Petzval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\" align=\"center\" height=\"68\" rowspan=\"4\"\u003eLens Elements\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eSuper ED Glass x2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eED Glass x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eLanthanum Glass x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eX-Element x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eFocal Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e365 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eDiameter\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e76 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd align=\"center\"\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eImage circle\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\" align=\"center\" height=\"34\" rowspan=\"2\"\u003eFocuser\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eWIFD R\u0026amp;P Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eCompatible with EAF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\" align=\"center\" height=\"51\" rowspan=\"3\"\u003eAdapter Included\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eSensor Tilt Xterminator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eRotator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eM54, M48 Camera Adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eOptional Flattener\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eNo Flattener Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\" align=\"center\" height=\"119\" rowspan=\"7\"\u003eT-Mount Supported\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eCanon EF, RF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eNikon F, Z\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eSony E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003ePentax K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eMFT (M4\/3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eFUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\" align=\"center\" height=\"68\" rowspan=\"4\"\u003eCamera Format\u003c\/td\u003e\n\u003ctd align=\"center\"\u003eMedium Format (Compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eFull Frame (Recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eAPS-C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\"\u003eM4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eTube Length\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e372 mm - 417 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" height=\"17\"\u003eTotal Weight\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e5.4 kg \/ 11.9 lbs\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\u003eUltra-Cat 76 OTA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eSensor Tilt Xterminator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eRotator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eM54 Camera Adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eM48 Camera Adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/istronomyplus.com\/pages\/william-optics-warranty?srsltid=AfmBOopOJhrnJJHCbIcAy4PqqyY3Z3eren5LqIaJQwywHgnuL-nCjtsn\" title=\"William Optics 2-year Warranty\" target=\"_blank\"\u003eWilliam Optics 2-year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":46602774118629,"sku":"WO-T-C-76","price":3033.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_a8bfb68b-45c9-4df2-b452-5c82561e6a22.webp?v=1742491487","url":"https:\/\/istronomyplus.com\/products\/william-optics-wifd-ultra-cat-76-f-4-8-apo-t-c-76","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}