{"product_id":"zwo-ff131-apo-flat-field-apochromatic-refractor","title":"ZWO FF131 APO - Flat-Field Apochromatic Refractor","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Principal_KV_6e2e1114-4264-493b-83ae-24304deea439.jpg?v=1781822412\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/icon_b19e25d8-894c-4638-a485-01432efc91b9.jpg?v=1781822503\" 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\u003ch1\u003eMain Features\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Highlights_7f698fce-2cce-4edd-af3c-f9759db11749.jpg?v=1781822538\" 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_229f483d-df9b-41ed-8599-bcfc8c0172e9.jpg?v=1781822563\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eUniqueness\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Element Optical Design\u003c\/strong\u003e\u003cbr\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.\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_f8a2a028-b315-499e-91ea-31f100f50fca.jpg?v=1781822593\" 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 FF131 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\/Photography_Extension_Tube.jpg?v=1781821732\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative Flat-Field Design\u003c\/strong\u003e\u003cbr\u003eThe FF131 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_7d55627f-8f31-4ebf-aff2-d647ccf40275.jpg?v=1781822631\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eConvenient Design\u003c\/h2\u003e\n\u003col start=\"4\"\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 FF131 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_c9253c2a-caad-470f-b60f-cc174e7ebd1e.jpg?v=1781821814\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield\u003c\/strong\u003e\u003cbr\u003eThe FF131 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_cae0b83b-9ce2-4f92-b345-934ff498e9cf.jpg?v=1781822695\" alt=\"\"\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhotography Extension Tube\u003c\/strong\u003e\u003cbr\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 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.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Extended_Photography.jpg?v=1781822794\" 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_316b4e83-d209-4aa4-ae1b-b940a63e70c9.jpg?v=1781822809\" 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_33c8bc79-468a-4932-b1ee-ff5aa5e70039.jpg?v=1781822820\" 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_size.jpg?v=1781822833\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/Product_size-1.jpg?v=1781822069\" 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_e96162a3-67a2-4394-a3af-02f694a36a37.jpg?v=1781822862\" 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_f791d9c8-f9ef-4954-8a54-84e08a955e3a.jpg?v=1781822878\" 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":49275678327041,"sku":"ZWO FF131-APO","price":1999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/1_606a375d-a0f9-4ca3-9631-1da4dfd21631.jpg?v=1781822332","url":"https:\/\/starizona.com\/products\/zwo-ff131-apo-flat-field-apochromatic-refractor","provider":"Starizona","version":"1.0","type":"link"}