{"product_id":"william-optics-ultra-cat-108","title":"William Optics Ultra-Cat 108","description":"\u003cp\u003eThe William Optics UltraCat108 is a cutting-edge 108mm apochromatic refractor designed for astrophotographers who demand top-tier performance. Featuring a 5-element advanced Petzval optical design and a fast f\/4.8 focal ratio, it delivers breathtaking edge-to-edge clarity and vivid detail, making it perfect for capturing expansive celestial views. Its robust build, exceptional optics, and innovative features redefine the standard for astrophotography.\u003c\/p\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\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\u003e60mm Superior Image Circle\u003cbr\u003e\u003c\/strong\u003eFully supports full-frame and medium-format cameras for wide-field and detailed astrophotography, outperforming standard 106mm telescopes.\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\u003cp\u003e\u003cstrong\u003ePersonalized Laser Engraving\u003cbr\u003e\u003c\/strong\u003eFree customization for direct purchases, adding a personal touch to your telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification;\u003c\/strong\u003e\u003cstrong\u003e\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\u003e518 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e108 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\u003e60 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\u003e0-30 mm (Ruler to 31mm)\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\u003eM68, M54, 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\u003eMedium Format\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\u003eLosmandy\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTube Length\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e512.9 mm - 617.9 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eOTA Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e7.96 kg \/ 17.55 lbs\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTotal Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e9.58 kg \/ 21.12 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-108_SD100.jpg?v=1734417307\" target=\"_blank\"\u003e\u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_SD100.jpg?v=1734417307\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_LA.jpg?v=1744873636\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_LA.jpg?v=1744873636\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_MTF.jpg?v=1732782890\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_MTF.jpg?v=1732782890\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_RI.jpg?v=1732782890\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_UltraCat-108_RI.jpg?v=1732782890\"\u003e\u003c\/a\u003e\u003c\/strong\u003e\u003cstrong\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\u003cdiv class=\"multi-column__item  snap-center group\"\u003e\n\u003cdiv class=\"overflow-hidden\"\u003e\u003cimg src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=2806\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-OTA.jpg?v=1745562300\u0026amp;width=1800 1800w\" width=\"2806\" height=\"2806\" sizes=\"(max-width: 699px) 35vw, (max-width: 999px) 38vw, calc((100vw - 3rem * 2) \/ 7)\" 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) \/ 7)\" 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\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=2500\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=800 800w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=1000 1000w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=1200 1200w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=1400 1400w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=1600 1600w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap.jpg?v=1748503003\u0026amp;width=1800 1800w\" width=\"2500\" height=\"2501\" loading=\"lazy\" sizes=\"(max-width: 699px) 35vw, (max-width: 999px) 38vw, calc((100vw - 3rem * 2) \/ 7)\" class=\"zoom-image group-hover:zoom\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"prose text-center\"\u003e\n\u003cp\u003e\u003cstrong\u003eM48, M54, M68\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 - 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