{"product_id":"zwo-ff90-apo-refractor","title":"ZWO FF90 APO Flat-Field Apochromatic Refractor (FF90-APO)","description":"\u003ch1\u003eZWO FF90 APO Flat-Field Apochromatic Refractor\u003c\/h1\u003e\n\u003cp\u003e\u003cimg alt=\"ZWO FF90 APO Refractor\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Principal_KV_4ed1c655-c6f1-40c3-98ac-e247765b6d43.jpg?v=1780693679\"\u003e\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003eThe ZWO FF90 APO Refractor is a lightweight, compact refractor telescope designed for visual observation and astrophotography.\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/90icon.jpg?v=1780693931\"\u003e\u003c\/p\u003e\n\u003cp class=\"western\" lang=\"en-US\"\u003e*Focus is achieved within a 45–75 mm back focus range, 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=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Highlights_43d7f907-8f1e-47ef-a6e5-698352b53495.jpg?v=1780693961\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" 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=\"center\" 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\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Scene_c6263b49-aa27-4f5b-9655-07e113681cdc.jpg?v=1780694009\"\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\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\u003ePowerful Uniqueness\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e1. Lightweight \u0026amp; Compact\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThis unit features a 90 mm aperture and 609 mm focal length (f\/6.8) for portability and performance.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe optical tube weighs 3.92 kg. Total system weight is 4.52 kg including the mounting rings and dovetail plate.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Lightweight_Compact_13793a5b-caf8-432b-94cc-e8ffc9b9fdd1.jpg?v=1780694128\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e2. Four-Element Optical Design\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003eThe optics use a four-element, air-spaced apochromatic design. All elements work together to deliver a flat imaging field.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003eOne ED glass element effectively reduces chromatic aberration. This results in superior color correction and image clarity.\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\/Four-Element_Optical_Design_e21edac7-906e-479e-8793-7c2251ea5f98.jpg?v=1780694212\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e3. 44 mm Image Circle — Full-Frame Support\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003eWith a 44 mm image circle, the unit supports full-frame sensors. It is ideal for use with an asiair pro for smart control.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003eIt delivers sharp star fields with excellent edge-to-edge performance. This ensures consistent quality across the frame.\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\/Full-Frame_Support_d04b1df0-0590-440c-84d5-19bccf4d7dbf.jpg?v=1780694237\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e \u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e4. Native Flat-Field Design\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe optical system features a native flat-field design. This eliminates the need for an additional field flattener.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eComplex back focus calculations are not required. Simply attach your imaging setup and start capturing once focused.\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.jpg?v=1780694266\" alt=\"\"\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 Mechanical Design\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e5. Coarse \u0026amp; Fine Focus Adjustment\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eEquipped with a rigid 3-inch rack-and-pinion focuser, it offers precise 1:10 dual-speed coarse and fine adjustments.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eA built-in 360° rotator at the rear allows for smooth, accurate camera angle adjustments during your session.\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_65f277d8-7f07-4d82-9d47-c3d3ad3e024d.jpg?v=1780694528\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e6. Retractable Dew Shield\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThis model features a retractable dew shield for portability. This helps protect your optical tube in the field.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003ePrecision CNC machining and internal anti-reflection coatings help minimize stray light to enhance image contrast.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003e7. Quick-Release Mounting Rings\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\"\u003eThe mounting rings are detachable. This allows for quick and easy setup or teardown at any dark site.\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_174524b0-f367-4b56-acc7-db9975607562.jpg?v=1780694579\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003e8. Photography Extension Tube\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003eThe package includes a photography extension tube with a 2-inch filter thread and M48 and M54 adapters.\u003c\/p\u003e\n\u003cp lang=\"en-US\" class=\"western\" align=\"left\"\u003eThese components allow for easy integration with a wide range of modern imaging accessories and cameras.\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\/Photography_Extension_Tube.jpg?v=1780694659\" alt=\"\"\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 Charts\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.jpg?v=1780694759\" alt=\"\"\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_2af8e94d-3bb3-433b-8c9d-fc903703cdd4.jpg?v=1780694795\" alt=\"\"\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\u003cspan style=\"color: #000000;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Product_structure_bbf71e2f-15dc-4f41-b82c-461dc47ba414.jpg?v=1780694851\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 lang=\"en-US\" class=\"western\" align=\"left\"\u003e\n\u003cspan style=\"color: #000000;\"\u003eTechnical Specifications\u003c\/span\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Product_parameters_c49055f5-22f3-458f-b2b6-f06b0c8a8928.jpg?v=1780694955\" alt=\"\"\u003e\u003c\/span\u003e\n\u003c\/h3\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_14da2fe7-dc02-4b34-8af3-ae0da9b60f61.jpg?v=1780695005\" alt=\"\"\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-Year Warranty\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":49480294695141,"sku":"ZWO-FF90-APO","price":1409.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_d38635bc-8ca6-4689-a839-0decce1b4e45.jpg?v=1780758185","url":"https:\/\/astronomyplus.com\/products\/zwo-ff90-apo-refractor","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}