{"product_id":"william-optics-cat-91-wifd","title":"William Optics Cat 91 WIFD","description":"\u003cdiv part=\"body\"\u003e\n\u003cdiv id=\"description\" class=\"card-modal__content\"\u003e\n\u003cp\u003e\u003cspan\u003eStep up your astrophotography game with the William Optics Cat 91, an advanced apochromatic refractor tailored for full-frame and medium-format cameras. This first addition to the Ultra Cat series combines portability with superior optical performance, making it a versatile tool for capturing breathtaking detail in deep-sky objects.\u003c\/span\u003e\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.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Cat 91 blends the trusted Cat heritage with William Optics’ innovative design, making it the ultimate choice for those ready to elevate their night-sky explorations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"static-tabs__nav\"\u003e\u003cstrong\u003e\u003clabel class=\"static-tabs__tab-label h5\" for=\"tab-trigger-static_tab_item_U3p7A9\"\u003eSpecification;\u003c\/label\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"static-tabs__content-wrapper\"\u003e\n\u003cdiv id=\"content-static_tab_item_U3p7A9\" class=\"static-tabs__content prose\"\u003e\n\u003cdiv class=\"definition specification\"\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\u003e448 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e91 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocal Ratio\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003ef\/4.9\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eImage Circle\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e55 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\u003e0-36 mm (Ruler to 40mm)\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eBack Spacing\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eMaximum: M48 (60.8mm),M54 (65.8mm)\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eAdapter Included\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eTilt Adjuster\u003c\/span\u003e \u003cspan\u003eRotator\u003c\/span\u003e \u003cspan\u003eM63 → M54 Adapter\u003c\/span\u003e \u003cspan\u003eM63 → M48 Adapter\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\u003eMedium Format (needs additional adapter)\u003c\/span\u003e \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\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTube Length\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e556 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eOTA Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e4.72 kg \/ 10.41 lbs\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTotal Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e6.3 kg \/ 13.89 lbs\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel class=\"static-tabs__tab-label h5\" for=\"tab-trigger-static_tab_item_6jWdWm\"\u003eDiagram Reports;\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_1.jpg?v=1728521717\" target=\"_blank\"\u003e\u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_1.jpg?v=1728521717\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_1-1.jpg?v=1730343493\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_1-1.jpg?v=1730343493\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_2.jpg?v=1728521718\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_2.jpg?v=1728521718\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_3.jpg?v=1728521717\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_3.jpg?v=1728521717\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_4.jpg?v=1728521717\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_Cat-91_4.jpg?v=1728521717\"\u003e\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"section-header justify-self-center text-center\"\u003e\n\u003cdiv class=\"prose\"\u003e\n\u003ch2 class=\"h2\"\u003e                                 What's in the box\u003c\/h2\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-maintube.jpg?v=1728628652\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.jpg?v=1728628652\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-maintube.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\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\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-adapter.jpg?v=1728628652\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\u003eM48, M54\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eCamera Adapter\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-plate.jpg?v=1728628652\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-plate.jpg?v=1728628652\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\u003eVixen-style 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\/Cat-91-WIFD-whatsinbox-mounting.jpg?v=1736746843\u0026amp;width=2400\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-mounting.jpg?v=1736746843\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/Cat-91-WIFD-whatsinbox-mounting.jpg?v=1736746843\u0026amp;width=400 400w, 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