{"product_id":"askar-203apo-triplet-apo-refractor-telescope","title":"Askar 203APO Triplet APO Refractor Telescope","description":"\u003cp\u003eThe \u003cstrong\u003eAskar 203APO\u003c\/strong\u003e is the flagship of the Askar APO series — an eight-inch (203mm) aperture, f\/7 triplet air-spaced apochromatic refractor from Askar (Jiaxing Sharpstar Optical Instrument Co., Ltd.). With a 1421mm focal length and a limiting magnitude of 13.3, the 203APO represents the pinnacle of what Askar has achieved in large-aperture refractor design, combining exceptional optical performance with a well-thought-out mechanical package that manages the weight and size challenges of this aperture class.\u003c\/p\u003e\n\n\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProfessional and elite-level astrophotographers\u003c\/strong\u003e who demand the absolute maximum from a refractor platform\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eObservatory operators\u003c\/strong\u003e with permanent pier setups and heavy-payload mounts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-resolution galaxy, globular cluster, and planetary nebula imagers\u003c\/strong\u003e where aperture and focal length are everything\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdvanced visual observers\u003c\/strong\u003e seeking the finest large-aperture refractor experience available\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e203mm (8\") f\/7 triplet APO optics\u003c\/strong\u003e with one ED glass element — extraordinary light-gathering power with true APO colour correction\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLimiting magnitude of 13.3\u003c\/strong\u003e — the deepest in the Askar APO series; 20% larger aperture area than the 185APO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated retractable rear lens tube\u003c\/strong\u003e (150mm) with rudder-type locking ring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3.5\" dual-speed rack-and-pinion focuser\u003c\/strong\u003e with 1:10 fine adjustment, 100mm travel, CNC machined anti-reflective interior\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e360° high-precision rotator\u003c\/strong\u003e with locking scale\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e500mm Losmandy dovetail plate included\u003c\/strong\u003e — the longest in the APO series, providing maximum balance flexibility\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtended 402mm handle\u003c\/strong\u003e with slot design for finder scope or accessory mounting\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnhanced triplet tube ring design\u003c\/strong\u003e for maximum rigidity under heavy loads\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo finder scope bases\u003c\/strong\u003e flanking the focuser\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEAF-compatible focuser\u003c\/strong\u003e for motorized autofocus\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eShips in a protective aluminum case\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnique identification name ring\u003c\/strong\u003e on every unit\u003c\/li\u003e\n  \u003cli\u003eDedicated optional reducer and flattener accessories planned for future release\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eElite-level high-resolution deep-sky astrophotography with full-frame cameras\u003c\/li\u003e\n  \u003cli\u003eGalaxy imaging where 1421mm focal length and 203mm aperture reveal fine structural detail\u003c\/li\u003e\n  \u003cli\u003ePlanetary nebulae, globular clusters, and fine-structure emission nebula imaging\u003c\/li\u003e\n  \u003cli\u003eLRGB and narrowband filter imaging at extreme resolution\u003c\/li\u003e\n  \u003cli\u003eVisual observing with 1.25\" or 2\" eyepieces and diagonals\u003c\/li\u003e\n  \u003cli\u003eBinoviewer use (rear tube contracted)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRear thread:\u003c\/strong\u003e M84 female; includes 2\"\/1.25\" visual adapters\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDovetail:\u003c\/strong\u003e 500mm Losmandy standard (included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEAF:\u003c\/strong\u003e Compatible with ZWO EAF and most motorized focusers (sold separately)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBinoviewer:\u003c\/strong\u003e Rear tube contracts for compatibility\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOptional reducer and flattener:\u003c\/strong\u003e Dedicated 203APO correctors are planned for future release by Askar\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAt 23.5kg gross weight, requires an \u003cstrong\u003eextremely high-payload equatorial mount\u003c\/strong\u003e — 30kg+ imaging capacity is strongly recommended\u003c\/li\u003e\n  \u003cli\u003eThis is a \u003cstrong\u003epermanent observatory instrument\u003c\/strong\u003e — not suitable for portable use, travel, or small mounts\u003c\/li\u003e\n  \u003cli\u003eDedicated reducer and flattener accessories are \u003cstrong\u003enot yet available\u003c\/strong\u003e at time of listing — monitor Askar for release\u003c\/li\u003e\n  \u003cli\u003eStrictly for \u003cstrong\u003eexpert-level users\u003c\/strong\u003e with substantial astrophotography experience\u003c\/li\u003e\n  \u003cli\u003eEAF and all accessories sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the 203APO compare to the 185APO?\u003c\/strong\u003e\u003cbr\u003e\nThe 203APO has 20% more aperture area, a deeper limiting magnitude of 13.3, a longer 1421mm focal length, a heavier 23.5kg gross weight, and a larger 500mm Losmandy dovetail. It requires the most capable mounts and is strictly an observatory-class instrument.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat mount do I need?\u003c\/strong\u003e\u003cbr\u003e\nAt 23.5kg gross, look for mounts with 30kg+ imaging payload — for example, a Skywatcher EQ8-R Pro, iOptron CEM120EC, Software Bisque Paramount, or similar observatory-grade mount. The 500mm Losmandy dovetail offers excellent balance range for this heavy OTA.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre there reducers or flatteners available?\u003c\/strong\u003e\u003cbr\u003e\nAskar has indicated that dedicated 203APO correctors are planned for future release. At the time of this listing, none are yet available. Please check with us for current availability.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003cbr\u003e\nYes. The focuser accepts 1.25\" and 2\" diagonals and eyepieces. The rear tube contracts for binoviewer use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs motorized autofocus supported?\u003c\/strong\u003e\u003cbr\u003e\nYes — the focuser is compatible with ZWO EAF and most third-party motorized autofocusers (sold separately).\u003c\/p\u003e\n\n\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\n\u003cp\u003eThe Askar 203APO is the ultimate expression of the APO series — an eight-inch apochromatic refractor that delivers extraordinary resolution, depth, and optical quality in a highly refined mechanical package. If you operate a permanent observatory with a mount capable of handling 23.5kg+, and you want the finest refractor in this aperture class, the 203APO is a genuinely exceptional choice. Be aware that dedicated corrector accessories are not yet available, so this telescope is currently best used at its native f\/7. Not suitable for beginners, portable rigs, or mounts with less than 30kg imaging payload.\u003c\/p\u003e\n\n\u003ch2\u003eOptical Diagram Reports\u003c\/h2\u003e\n\u003cp\u003eThe following optical reports and technical diagrams are provided by Askar for the 203APO:\u003c\/p\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/66691d1d-392d-4b67-9b66-a4732f6190d2.jpg\" alt=\"Askar 203APO Optical Path Diagram showing triplet APO lens element configuration\" style=\"max-width:100%;margin-bottom:12px;\"\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/5f2d7d63-4c7a-4769-9bfb-033eab43cbb8.jpg\" alt=\"Askar 203APO Product Size Diagram with full mechanical dimensions\" style=\"max-width:100%;margin-bottom:12px;\"\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/12134b7b-c16c-404a-ac13-8a0e52b0d6e5.jpg\" alt=\"Askar 203APO Connection Diagram\" style=\"max-width:100%;margin-bottom:12px;\"\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/0292f2d8-fe3c-461a-aa8a-4e473cfff802.jpg\" alt=\"Askar 203APO retractable lens tube instruction diagram\" style=\"max-width:100%;margin-bottom:12px;\"\u003e","brand":"Askar","offers":[{"title":"Default","offer_id":53155884400751,"sku":"203APO","price":12010.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/203apo1.webp?v=1779735843","url":"https:\/\/ontariotelescope.com\/products\/askar-203apo-triplet-apo-refractor-telescope","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}