{"product_id":"william-optics-ultra-cat-76-wifd-76mm-f-4-8-apochromatic-refractor-telescope-ota","title":"William Optics Ultra Cat 76 WIFD 76mm f\/4.8 Apochromatic Refractor Telescope (OTA)","description":"\u003cdiv\u003e \n \u003ch2\u003eWilliam Optics Ultra Cat  Overview\u003c\/h2\u003e \n\u003c\/div\u003e \n\u003cdiv\u003e  \n \u003cdiv\u003e \n  \u003cdiv\u003e\u003c\/div\u003e \n \u003c\/div\u003e \n \u003cdiv\u003e \n  \u003cdiv\u003e \n   \u003cp\u003eDesigned for astrophotography, the \u003cb\u003eUltra Cat 76 WIFD 76mm f\/4.8 Apochromatic Refractor Telescope\u003c\/b\u003e from \u003cb\u003eWilliam Optics\u003c\/b\u003e uses an unorthodox design for supporting heavy cameras and delivers a wide field with a fast focal ratio plus a Petzval lens for beautiful images. The WIFD (William Optic Internal Focus Design) places the 10:1 rack-and-pinion focuser in the center of the optical tube, eliminating the tilt and vignetting that can occur from heavy cameras on traditional rear-mounted focusers. The five-element Petzval-style lens yields a sharp image with no need for a flattener, and the dust cover has a built-in Bahtinov mask for tack-sharp star images. This optical tube assembly requires a mount and a tripod for use.\u003c\/p\u003e \n  \u003c\/div\u003e \n \u003c\/div\u003e \n \u003cdiv\u003e \n  \u003cdiv\u003e \n   \u003cdiv\u003e \n    \u003cdiv\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e\n        Optical Tube Assembly \n      \u003c\/div\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e \n       \u003cul\u003e \n        \u003cli\u003eFast f\/4.8 focal ratio and 365mm focal length for wide field of view and fast exposure times\u003c\/li\u003e \n        \u003cli\u003eApochromatic Petzval-style five-element lens, including ED and Lanthanum glass, produces rich views with minimal chromatic aberration\u003c\/li\u003e \n        \u003cli\u003eSharp image with no need for a separate field flattener\u003c\/li\u003e \n        \u003cli\u003eSupports 50mm image circle for full-frame, APS-C, and micro four thirds cameras\u003c\/li\u003e \n        \u003cli\u003eDust cover with integrated Bahtinov mask allows for fine focusing on stars\u003c\/li\u003e \n        \u003cli\u003eSensor Tilt Xterminator\/Rotator with M54 and M48 camera adapters\u003c\/li\u003e \n        \u003cli\u003eT-mount compatible with Canon EF and RF, Nikon F and Z, Sony E, Pentax K, micro four thirds, and FUJIFILM X\u003c\/li\u003e \n       \u003c\/ul\u003e \n      \u003c\/div\u003e \n     \u003c\/div\u003e \n    \u003c\/div\u003e \n    \u003cdiv\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e\n        Focuser \n      \u003c\/div\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e \n       \u003cul\u003e \n        \u003cli\u003eWilliam Optics Internal Focus Design places focuser in center of OTA to balance the weight of imaging systems\u003c\/li\u003e \n        \u003cli\u003ePrecise internal sliding of fixed optics prevents image shift, ensuring stable and clear observations\u003c\/li\u003e \n        \u003cli\u003e10:1 coarse and fine focus rack-and-pinion design\u003c\/li\u003e \n        \u003cli\u003eCompatible with ZWO EAF automatic focuser\u003c\/li\u003e \n        \u003cli\u003e0-20mm focus travel, ruler to 21mm\u003c\/li\u003e \n        \u003cli\u003eDial-style thermometer for gauging temperature effect on optical tube\u003c\/li\u003e \n       \u003c\/ul\u003e \n      \u003c\/div\u003e \n     \u003c\/div\u003e \n    \u003c\/div\u003e \n    \u003cdiv\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e\n        Use and Handling \n      \u003c\/div\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e \n       \u003cul\u003e \n        \u003cli\u003eAnodized aluminum optical tube\u003c\/li\u003e \n        \u003cli\u003eSturdy mounting rings and handle assembly with 210mm Vixen\/Arca-style dovetail\u003c\/li\u003e \n        \u003cli\u003eAdditional dovetail with thumbscrews on handle for guidescope\u003c\/li\u003e \n       \u003c\/ul\u003e \n      \u003c\/div\u003e \n     \u003c\/div\u003e \n    \u003c\/div\u003e \n   \u003c\/div\u003e \n  \u003c\/div\u003e \n \u003c\/div\u003e     Items Included  \n \u003cul\u003e \n  \u003cli\u003e\u003cspan\u003eWilliam Optics Ultra Cat 76 WIFD 76mm f\/4.8 Apochromatic Refractor Telescope (OTA)\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eBahtinov Cap\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eM54 Adapter\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eM48 Adapter\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eAdapter Wrench\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eVixen\/Arca-Style Dual-Side Plate\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eDual Mounting Rings with Handle Bar\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003e2 x Riser Block\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eAllen Key Set\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eSoft Carry Case\u003c\/span\u003e\u003c\/li\u003e \n  \u003cli\u003e\u003cspan\u003eLimited 2-Year Manufacturer Warranty\u003c\/span\u003e\u003c\/li\u003e \n \u003c\/ul\u003e    Not Included  \n \u003cul\u003e \n  \u003cli\u003e \n   \u003cdiv\u003e \n    \u003cdiv\u003e \n     \u003cdiv\u003e\n       Essential \n     \u003c\/div\u003e \n    \u003c\/div\u003e \n   \u003c\/div\u003e\n\u003ca\u003ePower Tanks \u0026amp; Adapters\u003c\/a\u003e\n\u003c\/li\u003e \n \u003c\/ul\u003e    Additional Resources  \n \u003cp\u003eNo additional resources available\u003c\/p\u003e   \n\u003c\/div\u003e \n\u003cdiv\u003e \n \u003cdiv\u003e \n  \u003cdiv\u003e \n   \u003cdiv\u003e \n    \u003cdiv\u003e \n     \u003cdiv\u003e \n      \u003ch2\u003eWilliam Optics Ultra Cat  Specs\u003c\/h2\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e\n        Key Specs \n      \u003c\/div\u003e \n      \u003ctable\u003e \n       \u003ctbody\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eAperture\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e76 mm \/ 3\"\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eFocal Length\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e365 mm\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eFocal Ratio\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003ef\/4.8\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eEyepiece\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003eSold Separately\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n       \u003c\/tbody\u003e \n      \u003c\/table\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003ctable\u003e \n       \u003ctbody\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eOptical Design\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003eRefractor\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eAperture\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e76 mm \/ 3\"\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eFocal Length\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e365 mm\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eFocal Ratio\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003ef\/4.8\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eFocuser\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003eDual-Speed Rack-and-Pinion\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eEyepiece\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003eSold Separately\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eFinderscope\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003eNo\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eMounting\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003eVixen Style\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eOptical Tube Dimensions\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e14.3\" \/ 363 mm (Retracted)\u003cbr\u003e16.3\" \/ 415 mm (Extended)\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n       \u003c\/tbody\u003e \n      \u003c\/table\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e\n        General \n      \u003c\/div\u003e \n      \u003ctable\u003e \n       \u003ctbody\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eWeight\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e11 lb \/ 5 kg\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n       \u003c\/tbody\u003e \n      \u003c\/table\u003e \n     \u003c\/div\u003e \n     \u003cdiv\u003e \n      \u003cdiv\u003e\n        Packaging Info \n      \u003c\/div\u003e \n      \u003ctable\u003e \n       \u003ctbody\u003e \n        \u003ctr\u003e \n         \u003ctd\u003ePackage Weight\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e16.295 lb\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n        \u003ctr\u003e \n         \u003ctd\u003eBox Dimensions (LxWxH)\u003c\/td\u003e \n         \u003ctd\u003e \n          \u003cdiv\u003e \n           \u003cspan\u003e17.9 x 13.4 x 10.2\"\u003c\/span\u003e \n          \u003c\/div\u003e\n\u003c\/td\u003e \n        \u003c\/tr\u003e \n       \u003c\/tbody\u003e \n      \u003c\/table\u003e \n     \u003c\/div\u003e \n    \u003c\/div\u003e \n   \u003c\/div\u003e \n  \u003c\/div\u003e \n \u003c\/div\u003e \n\u003c\/div\u003e\n\u003cp\u003eAll product and company names are trademarks or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.\u003c\/p\u003e","brand":"William Optics-10","offers":[{"title":"Default Title","offer_id":42633281994837,"sku":"WITC76BR:WITC76BR:bhpv","price":364875.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1034\/1611\/files\/1764688759_1934908.jpg?v=1782242898","url":"https:\/\/www.tanotis.com\/products\/william-optics-ultra-cat-76-wifd-76mm-f-4-8-apochromatic-refractor-telescope-ota","provider":"Tanotis","version":"1.0","type":"link"}