{"product_id":"zwo-ff131-apo-refractor","title":"ZWO FF131 APO Flat-Field Apochromatic Refractor (FF131-APO)","description":"\u003ch1\u003eZWO FF131 APO Flat-Field Apochromatic Refractor\u003c\/h1\u003e\n\u003cp\u003e\u003cimg alt=\"ZWO FF131 APO Refractor main banner\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Principal_KV_b0dc638d-e23b-4f4a-ba54-50ea9ae5342a.jpg?v=1780756718\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"ZWO icon\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/icon_a5f4ee21-0719-4efe-9384-ba59f9334c5a.jpg?v=1780756718\"\u003e\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003eThe ZWO FF131 APO Refractor achieves focus within a back focus range of 42–73 mm. This distance is measured from the M54–M48 interface shoulder.\u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\" lang=\"en-US\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-family: Helvetica Neue, serif;\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cb\u003eMain Features\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\" lang=\"en-US\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cimg alt=\"ZWO highlights\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Highlights_36892e8e-e2cb-40f9-9532-98d9a3763943.jpg?v=1780756718\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\" lang=\"en-US\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-family: Helvetica Neue, serif;\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cb\u003eFlexible Connectivity for Multiple Configurations\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\" lang=\"en-US\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cimg alt=\"Connectivity options\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Scene_62c54c1c-1c9c-42d4-af92-a2a9a923bd02.jpg?v=1780756718\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\" lang=\"en-US\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-family: Helvetica Neue, serif;\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cb\u003eUniqueness\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\"\u003e\u003cstrong\u003eFour-Element Optical Design\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003eThis telescope features a four-element, fully air-spaced design. These elements deliver a flat imaging field without a flattener.\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003eOne ED glass element effectively reduces chromatic aberration. This ensures superior color correction and high image clarity for astrophotographers.\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003e\u003cimg alt=\"Optical design diagram\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Four-Element_Optical_Design_55c41605-cd41-4cd4-844a-66f6c241f01d.jpg?v=1780756718\"\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\"\u003e\u003cb\u003e44 mm Image Circle — Full-Frame Support\u003c\/b\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eWith a 44 mm image circle, this telescope fully supports full-frame sensors. It accommodates a wide range of advanced imaging setups.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eIt produces sharp star fields with excellent edge performance. Enjoy consistent quality across the entire frame without vignetting.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Support_full-frame.jpg?v=1780756718\" alt=\"Full frame support diagram\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" align=\"left\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size: medium;\"\u003eNative Flat-Field Design\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-size: medium;\"\u003eThe native flat-field design eliminates the need for an external flattener. This simplifies your optical train for better results.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-size: medium;\"\u003eForget complex back focus calculations. Attach your imaging setup and start capturing once focal point is achieved.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Focus_9aa9f7e6-4a9a-4fdf-aac5-8c02830220c6.jpg?v=1780756718\" alt=\"Focusing mechanism\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-family: Helvetica Neue, serif;\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cb\u003eConvenient Refractor Design\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\"\u003e\u003cstrong\u003eCoarse \u0026amp; fine focus adjustment\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe rigid 3-inch rack-and-pinion focuser provides precise control. It uses a 1:10 dual-speed mechanism for perfect sharpness.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eA built-in 360° rotator at the rear allows for smooth camera rotation. This makes framing your celestial targets easy and accurate.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Focus_adjustment_651c4f5c-d2f9-462a-acc9-5b439d2d2d2a.jpg?v=1780756718\" alt=\"Focuser detail\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e5. Retractable Dew Shield\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe telescope features a retractable dew shield. This reduces its length for safer and easier portability during travel.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003ePrecision CNC machining and a high-quality finish ensure durability. Internal coatings minimize stray light to enhance image contrast.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e6. Quick-Release Mounting Rings\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe mounting rings are fully detachable. This allows for rapid setup or teardown of the telescope while in the field.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Clamp_a252a048-0b76-40af-987f-b07cc9460b72.jpg?v=1780756718\" alt=\"Mounting rings\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003ePhotography Extension Tube\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe FF131 APO integrates seamlessly with modern cameras. It includes a four-section extension tube with a 2-inch filter thread.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eRear adapters in M48 and M54 formats are included. This provides flexibility for connecting various astrophotography accessories out of the box.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Extended_Photography.jpg?v=1780756718\" alt=\"Extension tubes set\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-family: Helvetica Neue, serif;\"\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cb\u003ePerformance\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eOptical Layout\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Optical_path_diagram_b0042fa9-efc3-4d63-999b-3bd972ed9832.jpg?v=1780756718\" alt=\"Optical path\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eStar Field Map\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Bitmap_image_9cf4ef03-c3f2-471d-8f17-6baad492496d.jpg?v=1780756718\" alt=\"Star field map\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan style=\"font-family: Helvetica Neue, serif;\"\u003e\u003cspan style=\"font-size: medium;\"\u003eProduct Diagram\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Product_structure_size.jpg?v=1780756718\" alt=\"Product structure\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Product_size_3d5d5c48-90ce-41c6-98b6-9ddfad64e99f.jpg?v=1780756718\" alt=\"Product size\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 lang=\"en-US\" class=\"western\" align=\"left\"\u003e\u003cspan style=\"color: #000000;\"\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThese specs confirm why this telescope is a top choice for experts. It represents a high-performance imaging solution.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Product_parameters_8984e2ff-461e-43c1-b30f-4bea3f24bb30.jpg?v=1780756718\" alt=\"Technical parameters\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: #000000;\"\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Packaging_List_d6deb685-556e-4e2e-bfee-305978de2e44.jpg?v=1780756718\" alt=\"Included items list\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: #000000;\"\u003eWarranty\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/zwo-warranty\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"color: #000000;\"\u003eZWO 2-Years Warranty\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":49492381794533,"sku":"ZWO-FF131-APO","price":2819.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_67a7bbc3-c27c-4f49-ad8a-9240541a3099.jpg?v=1780774721","url":"https:\/\/astronomyplus.com\/products\/zwo-ff131-apo-refractor","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}