{"product_id":"william-optics-apochromatic-refractor-ap-56-269-ultracat-56-wifd","title":"William Optics Apochromatic refractor AP 56\/269 UltraCat 56 WIFD","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eThe Ultra-Cat 76 is a high-performance 76mm apochromatic refractor, designed for astrophotographers who demand exceptional clarity and true color accuracy.\u003c\/p\u003e\n\u003cp\u003eWith a 5-element advanced Petzval optical design, including super ED and lanthanum glass, and a fast f\/4.8 focal ratio, this telescope delivers stunningly sharp, flat-field images across its 50mm image circle. Optimized for Full Frame, APS-C, and M4\/3 sensors, it also offers compatibility with Medium Format cameras for outstanding wide-field astrophotography.\u003c\/p\u003e\n\u003cp\u003eNo Flattener Required: The optical design naturally corrects field curvature, simplifying setup.\u003c\/p\u003e\n\u003cp\u003eAnti-Shrink Lens Cell Technology: Reduces thermal expansion effects, maintaining perfect optical alignment in any climate.\u003c\/p\u003e\n\u003cp\u003ePatented Bahtinov Mask for Focusing: Built-in focusing aid ensures pinpoint star sharpness with ease.\u003c\/p\u003e\n\u003cp\u003eSensor Tilt Xterminator (STX) \u0026amp; Rotator: Integrated tilt adjuster eliminates sensor misalignment, ensuring uniform image sharpness.\u003c\/p\u003e\n\u003cp\u003eThe William Optics Internal Focus Design (WIFD) is an innovative and revolutionary design that combines a precise (patented) internal focusing mechanism with the highest quality optics available, offering the ultimate apochromatic refractor for astrophotography. Designed from the ground up to handle even the largest, heaviest, cooled cameras, this optics is uncompromising in its quality. The focuser movement is integrated into the main tube, so no adjustments are visible from the outside.\u003c\/p\u003e\n\u003cp\u003eThe user can enjoy the benefits of a conventional focuser with two fine focus controls without having to worry about the limitations normally found with conventional rear-mounted focusers (vignetting). The integrated position indicator window on the focuser allows instant verification of the graduated numerical display.\u003c\/p\u003e\n\u003cp\u003eThe focus is compatible with ZWO's EAF.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eSpecification\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; line-height: 1.4;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eOptics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eRefractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eType of build\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eApochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eAperture (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e56\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eFocal length (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e269\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eAperture ratio (f\/)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e4,8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eResolving capacity\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e2,46\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eLimit value (mag)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e10,5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eLight gathering capacity\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eMax. useful magnification\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e112\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eTube weight (kg)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e3,21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eTube length (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e348\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eCarrying length (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e296\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eTube material\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eAluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003elens design\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eFully Corrected Field (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eCoating\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003emultiple\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eFocuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eType of build\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eInternal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eTilting Adaptor\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eConnecting threaded socket (camera-side)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eM68, M54, M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eAdjustment range (mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003e30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eRotating\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eMount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eType of build\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eOTA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eMounting type\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eno mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eIncluded accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eDew Shield\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eCarry case\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003ePrism rail\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eVixen-Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eCorrector\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eintegrated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003efocusing help\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eBahtinov focus mask\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eFinder scope\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003ewithout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eGeneral\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eSeries\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eCat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eArea of application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eAstrophotography\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes (very good)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eMoon \u0026amp; Planets\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eNature Observation\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eno\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eNebulae \u0026amp; galaxies\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eSun\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eno (Only with appropriate Sun filter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"padding: 8px 4px 4px; font-weight: bold; font-size: 0.95em; border-bottom: 1px solid #333; color: #333;\"\u003eRecommended for\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eBeginners\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eno\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #ffffff;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eAdvanced\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f5f5f5;\"\u003e\n\u003ctd style=\"padding: 4px 6px; width: 50%; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eObservatories\u003c\/td\u003e\n\u003ctd style=\"padding: 4px 6px; font-size: 0.9em; color: #333; border-bottom: 1px solid #e8e8e8;\"\u003eno\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Nimax","offers":[{"title":"Default Title","offer_id":49835240063131,"sku":"88286","price":1250.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/5260\/1243\/files\/William-Optics-Apochromatic-refractor-AP-56-269-UltraCat-56-WIFD_1.jpg?v=1792139531","url":"https:\/\/astronoscope.com\/products\/william-optics-apochromatic-refractor-ap-56-269-ultracat-56-wifd","provider":"Astronoscope","version":"1.0","type":"link"}