{"product_id":"william-optics-ultra-cat-131-wifd-t-c-131br","title":"William Optics Ultra-Cat 131 WIFD - T-C-131BR","description":"\u003cp data-start=\"97\" data-end=\"497\"\u003e\u003cstrong data-start=\"97\" data-end=\"133\"\u003eThe William Optics Ultra-Cat 131\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis the flagship of the Ultra-Cat series, representing the pinnacle of wide-field astrophotography performance. Built around a large-aperture 131mm apochromatic optical system and an advanced 5-element Petzval design, it delivers extraordinary light-gathering power, exceptional color correction, and razor-sharp stars across an expansive, flat image circle.\u003c\/p\u003e\n\u003cp data-start=\"499\" data-end=\"887\"\u003eDesigned for serious astrophotographers and observatories alike, the Ultra-Cat 131 combines a fast focal ratio with uncompromising optical precision, enabling stunning deep-sky detail, rich contrast, and immersive wide-field compositions. Its premium mechanical construction, thermal stability, and flagship-level engineering set a new benchmark for large-format astrophotography systems.\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\/4.9 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\u003cdl\u003e\n\u003cdt\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e Lens Type\u003c\/td\u003e\n\u003ctd\u003e5-Element Advanced Petzval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eSuper ED Glass x2 ED Glass x1 Lanthanum Glass x1 X-Element x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e648 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e131 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e60 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eWIFD R\u0026amp;P Focuser Compatible with EAF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e\n\u003cbr\u003e0-20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Included\u003c\/td\u003e\n\u003ctd\u003eSensor Tilt Xterminator Rotator M68, M54, M48 Camera Adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional Flattener\u003cbr\u003e\n\u003c\/td\u003e\n\u003ctd\u003eNo Flattener Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-Mount Support\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF Nikon F, Z Sony E Pentax K MFT (M4\/3) FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Format\u003c\/td\u003e\n\u003ctd\u003eMedium Format Full Frame APS-C M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Type\u003c\/td\u003e\n\u003ctd\u003eLosmandy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e650 mm - 785.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e9.95 kg \/ 21.94 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eWIFD R\u0026amp;P Focuser\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eCompatible with EAF\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003eFocuser Travel\u003c\/dt\u003e\n\u003cdd\u003e0-20 mm\u003c\/dd\u003e\n\u003cdt\u003eAdapter Included\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eSensor Tilt Xterminator\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eRotator\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eM68, M54, M48 Camera Adapters\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003eOptional Flattener\u003c\/dt\u003e\n\u003cdd\u003eNo Flattener Required\u003c\/dd\u003e\n\u003cdt\u003eT-Mount Support\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eCanon EF, RF\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eNikon F, Z\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eSony E\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ePentax K\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eMFT (M4\/3)\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eFUJI X\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003eCamera Format\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eMedium Format\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eFull Frame\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eAPS-C\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eM4\/3\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003eDovetail Type\u003c\/dt\u003e\n\u003cdd\u003eLosmandy\u003c\/dd\u003e\n\u003cdt\u003eTube Length\u003c\/dt\u003e\n\u003cdd\u003e650 mm - 785.5 mm\u003c\/dd\u003e\n\u003cdt\u003eOTA Weight\u003c\/dt\u003e\n\u003cdd\u003e11.3 kg \/ 24.91 lbs\u003c\/dd\u003e\n\u003cdt\u003eTotal Weight\u003c\/dt\u003e\n\u003cdd\u003e13.97 kg \/ 30.8 lbs\u003c\/dd\u003e\n\u003c\/dl\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48820328562907,"sku":"T-C-131BR","price":7449.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0224\/6770\/6960\/files\/william-optics-telescopes-william-optics-ultra-cat-131-wifd-t-c-131br-1240868527.webp?v=1780066808","url":"https:\/\/telescopescanada.ca\/fr\/products\/william-optics-ultra-cat-131-wifd-t-c-131br","provider":"Telescopes Canada","version":"1.0","type":"link"}