{"product_id":"ultra-cat-76","title":"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","brand":"William Optics","offers":[{"title":"Ultra","offer_id":46471467368665,"sku":"T-C-76BR","price":1888.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0675\/5752\/3673\/files\/UC-76-pers-1.jpg?v=1756707103","url":"https:\/\/williamoptics.com\/products\/ultra-cat-76","provider":"William Optics","version":"1.0","type":"link"}