{"product_id":"william-optics-ultra-cat-76","title":"William Optics Ultra-Cat 76","description":"\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003eUltra-Cat 76\u003c\/strong\u003e\u003cspan\u003e is a high-performance \u003c\/span\u003e\u003cspan\u003e76mm apochromatic refractor\u003c\/span\u003e\u003cspan\u003e, designed for \u003c\/span\u003e\u003cspan\u003eastrophotographers who demand \u003c\/span\u003e\u003cspan\u003eexceptional clarity and true color accuracy\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWith a\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003e5-element advanced Petzval optical design\u003c\/strong\u003e\u003cspan\u003e, including \u003c\/span\u003e\u003cspan\u003esuper ED and lanthanum glass\u003c\/span\u003e\u003cspan\u003e, and a \u003c\/span\u003e\u003cspan\u003efast f\/4.8 focal ratio\u003c\/span\u003e\u003cspan\u003e, this telescope delivers \u003c\/span\u003e\u003cspan\u003estunningly sharp, flat-field images\u003c\/span\u003e\u003cspan\u003e across its \u003c\/span\u003e\u003cstrong\u003e50mm image circle\u003c\/strong\u003e\u003cspan\u003e. Optimized for \u003c\/span\u003e\u003cspan\u003eFull Frame, APS-C, and M4\/3 sensors\u003c\/span\u003e\u003cspan\u003e, it also offers \u003c\/span\u003e\u003cspan\u003ecompatibility with Medium Format cameras \u003c\/span\u003e\u003cspan\u003efor outstanding wide-field astrophotography.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eKey Features:\u003cb\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003eAdvanced 5-Element Petzval Optics\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003eEliminates field curvature, ensuring sharp, edge-to-edge stars without additional flatteners.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003e50mm Large Image Circle\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eFully supports Full Frame cameras, APS-C and M4\/3 sensors for optimal performance. Compatible with Medium Format.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003eFast f\/4.8 Optics\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eSuperior light-gathering capability, enabling deep-sky imaging with shorter exposure times.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003eWIFD (William’s Internal Focuser Design)\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003ePatented internal rack-and-pinion focuser ensures stable and precise focusing.\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eNo vignetting or balance issues — ideal for astrophotography.\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eCompatible with EAF (Electronic Automatic Focuser) for precision focus control.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003eSensor Tilt Xterminator (STX) \u0026amp; Rotator\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eIntegrated tilt adjuster eliminates sensor misalignment, ensuring uniform image sharpness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003eNo Flattener Required\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eThe optical design naturally corrects field curvature, simplifying setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003eAnti-Shrink Lens Cell Technology\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eReduces thermal expansion effects, maintaining perfect optical alignment in any climate.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003ePatented Bahtinov Mask for Focusing\u003c\/strong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eBuilt-in focusing aid ensures pinpoint star sharpness with ease.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cstrong\u003ePremium Build \u0026amp; Ergonomic Design\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003eLightweight yet robust (4.31 kg \/ 9.5 lbs) construction\u003c\/span\u003e\u003cspan\u003e with a sleek anodized finish.\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003ePatented handle bar design\u003c\/span\u003e\u003cspan\u003e for enhanced portability and ease of use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Camera Compatibility\u003c\/strong\u003e\u003cb id=\"docs-internal-guid-3d0f6d30-7fff-0dd9-1c91-b1df13dca75f\"\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/b\u003eSupports Canon EF, RF, Nikon F,Z, Sony E, Pentax K, MFT, and FUJI X mounts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification ;\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cstrong\u003eLens Type\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e5-Element Advanced Petzval\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eLens Elements\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eSuper ED Glass x2\u003c\/span\u003e \u003cspan\u003eED Glass x1\u003c\/span\u003e \u003cspan\u003eLanthanum Glass x1\u003c\/span\u003e \u003cspan\u003eX-Element x1\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocal Length\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e365 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e76 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocal Ratio\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003ef\/4.8\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eImage Circle\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e50 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocuser\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eWIFD R\u0026amp;P Focuser\u003c\/span\u003e \u003cspan\u003eCompatible with EAF\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocuser Travel\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e0-20 mm (Ruler to 21mm)\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eAdapter Included\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eSensor Tilt Xterminator\u003c\/span\u003e \u003cspan\u003eRotator\u003c\/span\u003e \u003cspan\u003eM54, M48 Camera Adapters\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eOptional Flattener\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eNo Flattener Required\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eT-Mount Support\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eCanon EF, RF\u003c\/span\u003e \u003cspan\u003eNikon F, Z\u003c\/span\u003e \u003cspan\u003eSony E\u003c\/span\u003e \u003cspan\u003ePentax K\u003c\/span\u003e \u003cspan\u003eMFT (M4\/3)\u003c\/span\u003e \u003cspan\u003eFUJI X\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eCamera Format\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eFull Frame\u003c\/span\u003e \u003cspan\u003eAPS-C\u003c\/span\u003e \u003cspan\u003eM4\/3\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDovetail Type\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eVixen ↔︎ Arca-Swiss\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTube Length\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e363 mm - 415 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eOTA Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e3.81 kg \/ 8.4 lbs\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTotal Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e4.98 kg \/ 10.98 lbs\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cp\u003e\u003cstrong\u003eDiagram Reports ;\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_SD.jpg?v=1765448193\" target=\"_blank\"\u003e\u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_SD.jpg?v=1765448193\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_LA.jpg?v=1765448234\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_LA.jpg?v=1765448234\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_MTF.jpg?v=1768987862\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_MTF.jpg?v=1768987862\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_RI.jpg?v=1768987863\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-76_RI.jpg?v=1768987863\"\u003e\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"h2\"\u003e                                  What's in the box\u003c\/h2\u003e\n\u003cdiv class=\"multi-column__item  snap-center group\"\u003e\n\u003cdiv class=\"overflow-hidden\"\u003e\u003cimg src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=2000\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-tube.jpg?v=1757039800\u0026amp;width=1800 1800w\" width=\"2000\" height=\"2000\" sizes=\"(max-width: 699px) 35vw, (max-width: 999px) 38vw, calc((100vw - 3rem * 2) \/ 8)\" class=\"zoom-image group-hover:zoom\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"prose text-center\"\u003e\n\u003cp\u003e\u003cstrong\u003eMain Tube\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"multi-column__item  snap-center group\"\u003e\n\u003cdiv class=\"overflow-hidden\"\u003e\u003cimg src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-bahtinov.jpg?v=1728628652\u0026amp;width=1800 1800w\" width=\"2400\" height=\"2400\" sizes=\"(max-width: 699px) 35vw, (max-width: 999px) 38vw, calc((100vw - 3rem * 2) \/ 8)\" class=\"zoom-image group-hover:zoom\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"prose text-center\"\u003e\n\u003cp\u003e\u003cstrong\u003eBahtinov Cap\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"multi-column__item  snap-center group\"\u003e\n\u003cdiv class=\"overflow-hidden\"\u003e\u003cimg src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=2000\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-cap.jpg?v=1757040361\u0026amp;width=1800 1800w\" width=\"2000\" height=\"2000\" loading=\"lazy\" sizes=\"(max-width: 699px) 35vw, (max-width: 999px) 38vw, calc((100vw - 3rem * 2) \/ 8)\" class=\"zoom-image group-hover:zoom\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"prose text-center\"\u003e\n\u003cp\u003e\u003cstrong\u003eM48, M54 Adapter with Wrench\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"multi-column__item  snap-center group\"\u003e\n\u003cdiv class=\"overflow-hidden\"\u003e\u003cimg src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/UC-76-wib-plate.jpg?v=1756952386\u0026amp;width=1800 1800w\" width=\"2400\" height=\"2400\" loading=\"lazy\" sizes=\"(max-width: 699px) 35vw, (max-width: 999px) 38vw, calc((100vw - 3rem * 2) \/ 8)\" class=\"zoom-image group-hover:zoom\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"prose text-center\"\u003e\n\u003cp\u003e\u003cstrong\u003eDual-side Plate\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"multi-column__item  snap-center group\"\u003e\n\u003cdiv class=\"overflow-hidden\"\u003e\u003cimg src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Redcat-71-whatsinbox-mounting.jpg?v=1705898875\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/Redcat-71-whatsinbox-mounting.jpg?v=1705898875\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/Redcat-71-whatsinbox-mounting.jpg?v=1705898875\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/Redcat-71-whatsinbox-mounting.jpg?v=1705898875\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/Redcat-71-whatsinbox-mounting.jpg?v=1705898875\u0026amp;width=600 600w, 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