{"product_id":"zwo-ff90-apo-flat-field-apochromatic-refractor","title":"ZWO FF90 APO - Flat-Field Apochromatic Refractor","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Principal_KV_92f375c7-4943-448a-8fd3-5d2b1900ace7.jpg?v=1781818968\" 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\/0327\/2569\/6648\/files\/90icon.jpg?v=1781818997\" 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\u003ch1\u003eMain Features\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Highlights_925327f8-7c89-42ca-9042-5ee9594783c4.jpg?v=1781819033\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eFlexible Connectivity for Multiple Configurations\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Scene_61643dc2-6b58-412e-94c4-73eb63f6e7e4.jpg?v=1781819065\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eUniqueness\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Compact\u003c\/strong\u003e\u003cbr\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.\u003cbr\u003eThe optical tube weighs just 3.92 kg, with a total system weight of 4.52 kg including mounting rings and dovetail plate.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Lightweight_Compact_466387c8-96f5-45e6-b0de-88b8fa0b9c3f.jpg?v=1781819119\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Element Optical Design\u003c\/strong\u003e\u003cbr\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.\u003cbr\u003eOne ED (extra-low dispersion) glass element is incorporated to effectively reduce chromatic aberration, resulting in improved color correction and image clarity.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Four-Element_Optical_Design_31ccc4ae-4dde-4e59-8d98-32bd8e136ffd.jpg?v=1781819164\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm Image Circle - Full-Frame Support\u003c\/strong\u003e\u003cbr\u003eWith a 44 mm image circle, the FF90 APO fully supports full-frame sensors and a wide range of imaging setups.\u003cbr\u003eIt delivers sharp star fields with excellent edge-to-edge performance, ensuring consistent image quality across the entire frame.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Full-Frame_Support.jpg?v=1781817560\" alt=\"\"\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative Flat-Field Design\u003c\/strong\u003e\u003cbr\u003eThe FF90 APO features a native flat-field optical design, eliminating the need for an additional field flattener.\u003cbr\u003eNo complex back focus calculations or spacing adjustments are required -- simply attach your imaging setup and start capturing once focus is achieved.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Focus_bbb5e85e-4d63-46ca-b4b5-f4f4c39aefa0.jpg?v=1781819240\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eConvenient Design\u003c\/h2\u003e\n\u003col start=\"5\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCourse \u0026amp; Fine Focus Adjustment\u003c\/strong\u003e\u003cbr\u003eEquipped with a rigid 3-inch rack-and-pinion focuser, the FF90 APO offers precise control with a 1:10 course \u0026amp; fine focus adjustment mechanism.\u003cbr\u003eA built-in 360° rotator at the rear allows for smooth and accurate camera angle adjustments.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Focus_adjustment_c05a49ea-7746-4167-ac46-d9b0f4c4ff70.jpg?v=1781819332\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield\u003c\/strong\u003e\u003cbr\u003eThe FF90 APO features a retractable dew shield, reducing overall length for improved portability.\u003cbr\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\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick-Release Mounting Rings\u003cbr\u003e\u003c\/strong\u003eThe mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Clamp_206d2af3-0c99-4bf4-b055-59cff047ee34.jpg?v=1781819383\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhotography Extension Tube\u003c\/strong\u003e\u003cbr\u003eThe FF90 APO includes a photography extension tube with a 2-inch filter thread, along with rear adapters in M48x0.75 and M54x0.75 standards. This allows for easy integration with a wide range of imaging accessories.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Extension_tube.jpg?v=1781818199\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch1\u003ePerformance\u003c\/h1\u003e\n\u003ch2\u003eOptical Layout\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Optical_path_diagram.jpg?v=1781819439\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eStar Field Map\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Bitmap_image_a6043795-7b4f-45f3-992f-ccf66249401d.jpg?v=1781819790\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct Diagram\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Product_structure.jpg?v=1781819818\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Product_parameters_d428afcd-38b1-470b-9b4b-73348f6a699d.jpg?v=1781819832\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch1\u003eWhat's in the box?\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Packaging_List.jpg?v=1781819850\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch1\u003eFF Series Telescope Comparison\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Comparison_Table.jpg?v=1781818375\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":49275551416577,"sku":"ZWO FF90-APO","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/1_4e4dfaf0-6fea-4bd8-873c-d552f4389760.jpg?v=1781818870","url":"https:\/\/starizona.com\/products\/zwo-ff90-apo-flat-field-apochromatic-refractor","provider":"Starizona","version":"1.0","type":"link"}