{"product_id":"zwo-ff90-apo","title":"ZWO FF90-APO","description":"\u003cp class=\"p1\"\u003eZWO FF90 APO\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFlat-Field Apochromatic Refractor\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Principal_KV_1a021da0-cbff-4659-b053-e11f20afdfb2.jpg?v=1780682984\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eLightweight \u0026amp; Compact · Designed for Both Visual Observation and Astrophotography\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p3\"\u003e\u003cb\u003eMain Features\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Highlights_70001fc6-f782-4ad7-99e2-808d234fac3d.jpg?v=1780682984\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/90icon.jpg?v=1780682983\" alt=\"\"\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eFlexible Connectivity for Multiple Configurations\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p5\"\u003e\u003cb\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Scene_014e6791-73c2-4aa5-b451-7495d2c6117e.jpg?v=1780682984\"\u003e\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eUniqueness\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e1. Lightweight \u0026amp; Compact\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p1\"\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 class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Lightweight_Compact_df0d8195-4420-452b-8253-83c6ac0c3988.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e2. Four-Element Optical Design\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p1\"\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 class=\"p1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Four-Element_Optical_Design_47a880e4-a802-40ac-86d3-25aa71408074.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e3. 44 mm Image Circle — Full-Frame Support\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p1\"\u003eIt delivers sharp star fields with excellent edge-to-edge performance, ensuring consistent image quality across the entire frame.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Full-Frame_Support_c5fb59c8-9b08-46ab-bf19-531f87e35f04.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e4. Native Flat-Field Design\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe FF90 APO features a native flat-field optical design, eliminating the need for an additional field flattener.\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p6\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eConvenient Design\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e5. Coarse \u0026amp; fine focus adjustment\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p1\"\u003eA built-in 360° rotator at the rear allows for smooth and accurate camera angle adjustments.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Focus_3368d32c-150b-46a6-baa1-ba73dd36d5e4.jpg?v=1780682985\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Focus_adjustment_89ea7082-410b-401d-89e5-943bc86f7d27.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e6. Retractable Dew Shield\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe FF90 APO features a retractable dew shield, reducing overall length for improved portability.\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p1\"\u003e7. Quick-Release Mounting Rings\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Clamp_ae78a705-c14b-4eb2-93e2-2442667ceb5c.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e8. Photography Extension Tube\u003c\/p\u003e\n\u003cp class=\"p1\"\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 class=\"p1\"\u003eThis allows for easy integration with a wide range of imaging accessories.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Photography_Extension_Tube.jpg?v=1780682985\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003ePerformance\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eOptical Layout\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Optical_path_diagram.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eStar Field Map\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Bitmap_image_6579cbd2-4e86-4b8f-9bf3-92427731d8c2.jpg?v=1780682983\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eProduct Diagram\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Product_structure.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eSpecifications\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Product_parameters_4c7f32fa-14c6-40d2-a38c-fd1fa6b536ad.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p7\"\u003eWhat's in the box?\u003c\/p\u003e\n\u003cp class=\"p8\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Packaging_List.jpg?v=1780682983\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFF Series Telescope Comparison\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/Comparison_Table_37642cf4-3cb0-40ec-9d2f-c7e6cfe56853.jpg?v=1780682984\" alt=\"\"\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":48489064136953,"sku":"ZWO FF90-APO","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/4_ebea2183-cd56-4623-ae28-e74a1a2cb239.jpg?v=1780683954","url":"https:\/\/cloudbreakoptics.com\/products\/zwo-ff90-apo","provider":"Cloud Break Optics","version":"1.0","type":"link"}