{"product_id":"zwo-ff-90-apo-flat-field-apochromatic-refractor-telescope-zwo-ff90-apo","title":"ZWO FF 90 APO Flat Field Apochromatic Refractor Telescope | ZWO FF90 APO","description":"\u003ch2\u003eZWO FF90 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_fb7bfcfc-574f-462f-af87-3c35222881af.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eLightweight \u0026amp; Compact · Designed for Both Visual Observation and Astrophotography\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/90icon.jpg?v=1781033816\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e*Focus can be achieved within a back focus range of 45–75 mm, measured from the M54–M48 interface shoulder.\u003c\/p\u003e\n\u003cp\u003eMain Features\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Highlights_6bb9ef72-537f-476e-92ef-e6128924184d.jpg?v=1781033816\" 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_b1c06c1a-295f-4df1-8ac9-a03224a9fc71.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eUniqueness\u003c\/h3\u003e\n\u003cp\u003e1. Lightweight \u0026amp; Compact\u003c\/p\u003e\n\u003cp\u003eThe ZWO FF90 APO features a 90 mm aperture and 609 mm focal length (f\/6.8), offering an excellent balance between portability and performance.\u003c\/p\u003e\n\u003cp\u003eThe optical tube weighs just 3.92 kg, with a total system weight of 4.52 kg including mounting rings and dovetail plate\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Lightweight_Compact_a737a9f8-0db2-4240-b846-7a7fc1e9d561.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e2. Four-Element Optical Design\u003c\/p\u003e\n\u003cp\u003eThe FF90 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_6e60314f-7083-4e36-b2c8-53b4550e3e74.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e3. 44 mm Image Circle — Full-Frame Support\u003c\/p\u003e\n\u003cp\u003eWith a 44 mm image circle, the FF90 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\/Full-Frame_Support_dc1919e1-a325-423c-9409-12c168941e77.jpg?v=1781033816\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e4. Native Flat-Field Design\u003c\/p\u003e\n\u003cp\u003eThe FF90 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.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eConvenient Design\u003c\/h3\u003e\n\u003cp\u003e5. Coarse \u0026amp; fine focus adjustment\u003c\/p\u003e\n\u003cp\u003eEquipped with a rigid 3-inch rack-and-pinion focuser, the FF90 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_1bd9958a-9dc3-4fee-bd26-a625c756a0b9.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e6. Retractable Dew Shield \u003c\/p\u003e\n\u003cp\u003eThe FF90 APO features a retractable dew shield, reducing overall length for improved portability.\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\u003e7. Quick-Release Mounting Rings\u003cbr\u003e\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_2e3faa6a-7eb1-41d4-8fe7-78a4e14757af.jpg?v=1781033816\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e8. Photography Extension Tube \u003c\/p\u003e\n\u003cp\u003eThe FF90 APO includes a photography extension tube with a 2-inch filter thread, along with rear adapters in M48×0.75 and M54×0.75 standards.\u003c\/p\u003e\n\u003cp\u003eThis allows for easy integration with a wide range of imaging accessories. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Photography_Extension_Tube.jpg?v=1781033817\" 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.jpg?v=1781033817\" 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_2c9b6912-3acb-41cc-86ca-fb03ca6086c2.jpg?v=1781033816\" 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_a477e486-c0dd-400b-931f-0bc07f37e3bb.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications \u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Product_parameters_759775aa-e607-485e-92f8-cdd6047337d5.jpg?v=1781033817\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhat's in the box?\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Packaging_List.jpg?v=1781033816\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eFF Series Telescope Comparison\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/Comparison_Table_4364c603-2b2a-4d2a-a7d4-551531a3ead5.jpg?v=1781033816\" alt=\"\"\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":49176444862716,"sku":"ZWO FF90 APO","price":1012.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/1_b521f4a8-090d-43b6-8101-9b627e89d764.jpg?v=1781034013","url":"https:\/\/usa.all-startelescope.com\/products\/zwo-ff-90-apo-flat-field-apochromatic-refractor-telescope-zwo-ff90-apo","provider":"All-Star Telescope Canada","version":"1.0","type":"link"}