{"product_id":"cat-91-wifd-30th-anniversary-limited-edition","title":"Cat 91 WIFD · 30th Anniversary Limited Edition","description":"\u003cp data-end=\"545\" data-start=\"185\"\u003eThe \u003cstrong data-end=\"232\" data-start=\"189\"\u003eCat 91 WIFD · 30th Anniversary Edition\u003c\/strong\u003e is a commemorative refractor celebrating three decades of William Optics craftsmanship and innovation. Built upon the acclaimed five-element advanced Petzval optical design, this limited edition of \u003cstrong data-end=\"454\" data-start=\"431\"\u003e30 units worldwide\u003c\/strong\u003e combines uncompromising astrophotography performance with a symbolic anniversary finish.\u003c\/p\u003e\n\u003cp data-end=\"799\" data-start=\"547\"\u003eFeaturing a unique \u003cstrong data-end=\"615\" data-start=\"566\"\u003elaser-engraved emblem of a cat embracing “30”\u003c\/strong\u003e and accompanied by a \u003cstrong data-end=\"669\" data-start=\"637\"\u003e30th Anniversary Certificate\u003c\/strong\u003e, the Cat 91 WIFD is not only a professional imaging instrument but also a collector’s piece that honors the Cat series legacy.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eHighlights:\u003cbr\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePetzval Design, No Backfocus Hassles\u003cbr\u003e\u003c\/strong\u003eThe 5-element Petzval design eliminates the need for backfocus adjustments, providing sharp, edge-to-edge images with pinpoint stars—ideal for wide-field and detailed astrophotography alike.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFull-Frame \u0026amp; Medium-Format Ready, No Extra Flattener Needed\u003cbr\u003e\u003c\/strong\u003eWith a large 55mm image circle, the Cat 91 is perfect for both full-frame and medium-format cameras. Its advanced optics achieve flat-field images without requiring an additional flattener, giving astrophotographers the freedom to capture expansive views with unparalleled clarity.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFast f\/4.9 Focal Ratio\u003cbr\u003e\u003c\/strong\u003eThe Cat 91's fast f\/4.9 focal ratio is designed for bright, vivid captures of galaxies, nebulae, and beyond, ensuring excellent light-gathering power and sharp detail even on faint celestial objects.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeamless WIFD Focusing\u003cbr\u003e\u003c\/strong\u003eEquipped with William Optics' WIFD focuser, the Cat 91 provides precise, stable focusing without additional adjustments, enhancing the ease of use for both seasoned astrophotographers and beginners.\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":48719495626969,"sku":"T-C-91-RD-30A","price":2698.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0675\/5752\/3673\/files\/C-91-30A-pers-1.jpg?v=1779249870","url":"https:\/\/williamoptics.com\/products\/cat-91-wifd-30th-anniversary-limited-edition","provider":"William Optics","version":"1.0","type":"link"}