{"product_id":"zwo-ff131-apo-flat-field-apochromatic-refractor-telescope-zwo-ff131-apo","title":"ZWO FF131 APO Flat Field Apochromatic Refractor Telescope | ZWO FF131 APO","description":"\u003ch2\u003eZWO FF131 APO Flat-Field Apochromatic Refractor\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Principal_KV_7180cf14-7e48-44eb-9613-c7ae1a87f4ca.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/icon_2bf0fe17-cc63-44aa-8b48-bf3b557f4a8a.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e*Focus can be achieved within a back focus range of 42–73 mm, measured from the M54–M48 interface shoulder.\u003c\/p\u003e\n\u003ch3\u003eMain Features\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Highlights_abefc971-eb16-4436-bfbf-eb023e10ff5e.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eFlexible Connectivity for Multiple Configurations\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Scene_b5046daf-1759-4c35-8b12-b11088b4745a.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eUniqueness\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e1.    Four-Element Optical Design\u003c\/p\u003e\n\u003cp\u003eThe FF131 APO features a four-element, fully air-spaced apochromatic optical design. All four elements work together to deliver a flat imaging field without the need for an additional field flattener.\u003c\/p\u003e\n\u003cp\u003eOne ED (extra-low dispersion) glass element is incorporated to effectively reduce chromatic aberration, resulting in improved color correction and image clarity.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Four-Element_Optical_Design_2d25a3d4-29e7-4a90-9969-fed06e6346dd.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e2.    44 mm Image Circle — Full-Frame Support\u003c\/p\u003e\n\u003cp\u003eWith a 44 mm image circle, the FF131 APO fully supports full-frame sensors and a wide range of imaging setups.\u003c\/p\u003e\n\u003cp\u003eIt delivers sharp star fields with excellent edge-to-edge performance, ensuring consistent image quality across the entire frame.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Support_full-frame.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e3.    Native Flat-Field Design\u003c\/p\u003e\n\u003cp\u003eThe FF131 APO features a native flat-field optical design, eliminating the need for an additional field flattener.\u003c\/p\u003e\n\u003cp\u003eNo complex back focus calculations or spacing adjustments are required—simply attach your imaging setup and start capturing once focus is achieved.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Focus_a39ae8ef-fc9c-46fd-baae-f61b6c489e01.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eConvenient Design\u003c\/h3\u003e\n\u003cp\u003e4.    Coarse \u0026amp; fine focus adjustment\u003c\/p\u003e\n\u003cp\u003eEquipped with a rigid 3-inch rack-and-pinion focuser, the FF131 APO offers precise control with a 1:10 coarse \u0026amp; fine focus adjustment mechanism.\u003c\/p\u003e\n\u003cp\u003eA built-in 360° rotator at the rear allows for smooth and accurate camera angle adjustments.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Focus_adjustment_b47f934c-2edf-4edb-a95d-9179e79561ac.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e5. Retractable Dew Shield \u003c\/p\u003e\n\u003cp\u003eThe FF131 APO features a retractable dew shield, reducing overall length for improved portability.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003ePrecision CNC machining and a high-quality painted finish, combined with an internal anti-reflection coating, help minimize stray light and enhance image contrast.\u003c\/p\u003e\n\u003cp\u003e6. Quick-Release Mounting Rings\u003c\/p\u003e\n\u003cp\u003eThe mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Clamp_11787650-8621-4344-b516-5b5c445aaddf.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003ePhotography Extension Tube\u003c\/h3\u003e\n\u003cp\u003eThe FF131 APO is designed for seamless integration with modern imaging systems, and includes a standard four-section photographic extension tube with a 2-inch filter thread. Rear adapters in both M48x0.75 and M54x0.75 formats are also included, making it easy to connect a wide range of cameras, filters, and astrophotography accessories for a clean, flexible setup right out of the box.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Extended_Photography.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003ePerformance\u003c\/h3\u003e\n\u003cp\u003eOptical Layout\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Optical_path_diagram_81a8db11-c47d-4602-8f9e-d2957d6c2722.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eStar Field Map\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Bitmap_image_e98a14ce-856b-4fc6-8751-889b703c93cf.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eProduct Diagram\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Product_structure_size.jpg?v=1781034791\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Product_parameters_2d1e44df-c812-4053-aa38-f535007c2a22.jpg?v=1781034791\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhat's in the box?\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Packaging_List_d865a5bd-d6bf-4049-983e-6003a1a7d0bf.jpg?v=1781034791\"\u003e\u003c\/p\u003e\n\u003cp\u003eFF Series Telescope Comparison\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Comparison_Table_fa9eedb1-5668-4c90-9f47-5bcdc556511f.jpg?v=1781034791\"\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":49176458625276,"sku":"ZWO FF131 APO","price":2024.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/5_ba0187a1-5041-4eb7-afe0-72f0a81830db.jpg?v=1781034696","url":"https:\/\/usa.all-startelescope.com\/products\/zwo-ff131-apo-flat-field-apochromatic-refractor-telescope-zwo-ff131-apo","provider":"All-Star Telescope Canada","version":"1.0","type":"link"}