{"product_id":"william-optics-ultra-cat-131","title":"William Optics Ultra-Cat 131","description":"\u003cp\u003e\u003cstrong\u003eThe William Optics Ultra-Cat 131\u003c\/strong\u003e is 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\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 Xterminator\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\u003cdiv class=\"static-tabs__nav\"\u003e\u003cstrong\u003e\u003clabel class=\"static-tabs__tab-label h5\" for=\"tab-trigger-static_tab_item_hXqfft\"\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_hXqfft\" 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\u003e648 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e131 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\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\u003e0-20 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eAdapter Included\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eSensor Tilt 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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-W.jpg?v=1783064429\u0026amp;width=2500\" alt=\"\" srcset=\"\/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap-W.jpg?v=1783064429\u0026amp;width=300 300w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap-W.jpg?v=1783064429\u0026amp;width=400 400w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap-W.jpg?v=1783064429\u0026amp;width=500 500w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap-W.jpg?v=1783064429\u0026amp;width=600 600w, \/\/williamoptics.com\/cdn\/shop\/files\/C-108-wib-cap-W.jpg?v=1783064429\u0026amp;width=800 800w, 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