{"title":"Correctors and Reducers","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    Round stars in the corners are not a processing achievement — they are a spacing achievement. Field flatteners and reducers correct the curved focal plane and off-axis aberrations that every telescope has to some degree, and they only work when spaced to within about a millimetre of their design distance. David Astro carries field flatteners and reducers in Canada, shipping from Canadian stock.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    This is the category where our back-focus calculation service saves the most frustration. Send us your telescope, camera and filters and we will specify the corrector and the exact spacers to go with it.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eFlatteners, Reducers and Coma Correctors\u003c\/h2\u003e\n  \u003cp\u003e\n    Each type solves a different optical problem, and using the wrong one degrades the field instead of correcting it.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eField flatteners:\u003c\/strong\u003e Correct focal plane curvature without changing focal length, so framing stays the same and only corner star shape improves.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFocal reducers:\u003c\/strong\u003e Flatten and shorten focal length, typically to 0.8x or 0.7x, widening the field and increasing the effective focal ratio for shorter exposures.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComa correctors:\u003c\/strong\u003e For Newtonian reflectors, correcting the comet-shaped off-axis stars inherent to a parabolic mirror, essential below about f\/6.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSCT reducer-correctors:\u003c\/strong\u003e Typically 0.63x units for Schmidt-Cassegrains, which both widen the field and considerably reduce exposure times at long focal lengths.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTelescope-specific versus universal:\u003c\/strong\u003e A corrector designed for your exact tube will outperform a universal one, particularly at the corners of large sensors.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBack-focus specification:\u003c\/strong\u003e Every corrector has a design distance from its rear surface to the sensor, commonly 55 mm. Missing it produces elongated corner stars pointing either inward or outward.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Field Flatteners and Reducers\u003c\/h2\u003e\n  \u003cp\u003e\n    A corrector is one of the few products where the accessory list matters as much as the product itself.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBack-focus calculated and spacers supplied:\u003c\/strong\u003e We provide the full component list including fine shims, and account for the focal shift your filter glass introduces.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStar shape diagnosis:\u003c\/strong\u003e If your corners are wrong, the direction of elongation tells us whether you are over- or under-spaced. Send us a corner crop and we will tell you which way to move.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTelescope-matched selection:\u003c\/strong\u003e We identify the corrector designed for your specific tube rather than defaulting to a universal unit that will underperform on a large sensor.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Genuine correctors with full manufacturer warranty, held in stock for fast domestic shipping.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eShips from Canada:\u003c\/strong\u003e No duties or brokerage fees for Canadian customers.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eField Flatteners and Reducers in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eHow precise does back-focus have to be?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eWithin about one millimetre for most correctors, and tighter at fast focal ratios. That is why filter thickness matters — a 3 mm filter shifts focus by roughly 1 mm, which is the entire tolerance.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eMy corner stars are elongated. Am I over or under spaced?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eStars elongated radially, pointing away from centre, generally indicate too much spacing. Tangentially elongated stars generally indicate too little. Send us a corner crop and we will confirm and give you a number.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eFlattener or reducer?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eUse a flattener if your framing is already right and only the corners are wrong. Use a reducer if you also want a wider field and shorter exposures, accepting that your image scale drops.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWill a universal corrector work on my telescope?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eSometimes acceptably, but a corrector matched to your specific tube will correct better at the edges, especially with an APS-C or larger sensor. Tell us your tube and we will check what exists for it.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eChasing corner stars?\u003c\/h2\u003e\n  \u003cp\u003eSend us your imaging train and a corner crop. We will calculate the spacing and specify the parts. Held in Canada, shipped fast.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"celestron-reducer-corrector","title":"Celestron Reducer - Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces telescope focal length by 37%\u003c\/li\u003e\n\u003cli\u003eConverts f\/10 SCTs to f\/6.3 and f\/11 systems to f\/7\u003c\/li\u003e\n\u003cli\u003eCompatible with Celestron C5, C6, C8, C9.25, C11, and C14 SCTs\u003c\/li\u003e\n\u003cli\u003eFully multi-coated optics for maximum light transmission\u003c\/li\u003e\n\u003cli\u003eWeighs just 4.3 oz (121.90 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron f\/6.3 Reducer - Corrector\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Reducer - Corrector transforms your Schmidt-Cassegrain telescope, effectively giving you two instruments in one by reducing the focal length by 37% to convert a native f\/10 system into a faster f\/6.3 optical train. This 4-element, fully multi-coated lens threads directly onto the rear cell of C5 to C14 SCTs, weighs only 4.3 oz (121.90 g), and measures 56mm in diameter. For astrophotographers, this focal reduction shortens exposure times by more than half, allowing you to capture faint deep-sky objects with greater efficiency.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eConvert f\/10 to f\/6.3: A 37% Focal Length Reduction\u003c\/h3\u003e\n\u003cp\u003eThis corrector-reducer lens alters the primary optical characteristics of your standard SCT. By reducing the focal length by 37%, it changes an f\/10 telescope to a much faster f\/6.3 system, and an f\/11 telescope to f\/7. This has profound benefits for both visual observation and imaging.\u003c\/p\u003e\n\u003cp\u003eVisually, you achieve a wider true field of view with any given eyepiece, making it easier to locate objects and frame large targets like the Andromeda Galaxy (M31) or the Pleiades (M45). For imaging, the faster focal ratio dramatically cuts down on necessary exposure time, allowing you to gather the same amount of signal in about one-third of the time required at f\/10.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFor C5 to C14 Standard SCTs: Visual and Photographic Use\u003c\/h3\u003e\n\u003cp\u003eThis reducer is designed specifically for Celestron's standard line of Schmidt-Cassegrain telescopes, offering broad compatibility from the portable C5 up to the observatory-class C14. It threads directly onto the rear cell, creating a secure connection for your imaging train or visual back.\u003c\/p\u003e\n\u003cp\u003eOnce installed, you can attach standard accessories like a T-Adapter for your DSLR or a 1.25\" visual back for diagonals and eyepieces. While it does provide some field-flattening for improved edge-of-field sharpness, its primary function is focal reduction, making it an essential tool for deep-sky astrophotography with non-EdgeHD optical tubes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e4.3 oz Machined Aluminum Body with Fully Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eEngineered for durability and optical clarity, the reducer is housed in a precisely machined aluminum body with a black anodized finish, weighing a mere 4.3 oz. The internal surfaces are blackened and glare-threaded to suppress internal reflections and maximize image contrast, ensuring a dark sky background.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-coated Lenses:\u003c\/strong\u003e Every air-to-glass surface features high-transmission coatings to ensure maximum light throughput and minimal reflection, preserving the brightness and fidelity of the image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnurled Grip:\u003c\/strong\u003e A textured, knurled surface provides a secure grip for easy threading and unthreading, even when wearing gloves in cold conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Design:\u003c\/strong\u003e At only 34mm (1.34\") in length, it adds minimal backfocus to your optical train, preserving compatibility with most existing accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStandard SCT vs. EdgeHD: Why This Reducer is Not for EdgeHD Optics\u003c\/h3\u003e\n\u003cp\u003eIt is critical to note that this f\/6.3 reducer is engineered for standard Schmidt-Cassegrain telescopes only and is not compatible with Celestron's EdgeHD optical tubes. EdgeHD telescopes have a built-in flattener and require a dedicated, optically matched reducer (like the Celestron .7x Reducer) to maintain their flat-field, coma-free imaging circle.\u003c\/p\u003e\n\u003cp\u003eUsing this standard reducer on an EdgeHD telescope will result in degraded optical performance and will not achieve the designed image quality of the EdgeHD system. If you own an EdgeHD scope, you must use the reducer specifically designed for that optical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Celestron f\/6.3 Reducer change the view in my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a Celestron 8\" SCT with a native 2032mm focal length, this reducer converts it to approximately 1280mm at f\/6.3. With a 25mm eyepiece, your magnification would drop from 81x to 51x, and your field of view would become significantly wider, making it easier to fit large deep-sky objects like the Orion Nebula (M42) into a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the optimal backfocus for the Celestron Reducer - Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optimal backfocus distance from the rear flange of the reducer to the camera sensor is approximately 105mm. Achieving this distance is crucial for obtaining the best possible image quality and the advertised focal reduction. You may need to use spacer rings to precisely match this distance with your specific camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Reducer - Corrector with an Off-Axis Guider (OAG)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use an OAG with this reducer. However, you must ensure that the total light path of your OAG, camera, and any adapters adds up to the required 105mm of backfocus for optimal performance. This often requires careful selection of components to hit the target spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy can't I use this reducer on my Celestron EdgeHD 9.25\" telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEdgeHD optical systems are designed with an integrated field flattener to provide a perfectly flat field for imaging. They require a specific, matched 0.7x reducer lens that is designed to work with that flattened field. Using this standard f\/6.3 reducer on an EdgeHD will introduce optical aberrations and will not maintain the edge-to-edge sharpness that is the primary feature of the EdgeHD design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this reducer completely eliminate field curvature in my standard SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not completely eliminate it. While the Celestron Reducer - Corrector does diminish some of the inherent field curvature of a standard SCT, its primary purpose is focal length reduction. You will notice flatter fields and sharper stars at the edge compared to using the telescope at its native focal length, but it does not produce a perfectly flat field like an EdgeHD system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Celestron Reducer - Corrector compatible with non-Celestron SCTs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer is optically designed and optimized for Celestron Schmidt-Cassegrain telescopes. While it may physically thread onto other brands of SCTs that use the standard 2\" rear cell thread, optical performance is not guaranteed and may vary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eReducer - Corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Reduction\u003c\/td\u003e\n\u003ctd\u003e0.63x (37% reduction)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMachined aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eCelestron C5, C6, C8, C9.25, C11, C14 (Standard SCTs only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncompatible With\u003c\/td\u003e\n\u003ctd\u003eEdgeHD, Maksutov-Cassegrain, Refractor, Newtonian Telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e56mm (2.2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e34mm (1.34\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4.3 oz (121.90 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Celestron Reducer - Corrector\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/celestron-reducer-corrector-1.jpg?v=1638308400\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCelestron f\/6.3 Reducer - Corrector\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Front Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/celestron-reducer-corrector-cap-1.jpg?v=1638308401\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Rear Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/celestron-reducer-corrector-cap-2.jpg?v=1638308402\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRear Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145832733,"sku":"CEL-94175","price":278.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Reducer-Corrector-94175-1__19018.1594230247.1280.1280.jpg?v=1684337165"},{"product_id":"celestron-reducer-lens-7x-edgehd-1100","title":"Celestron Reducer Lens .7x - EdgeHD 1100","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces EdgeHD 1100 focal ratio to f\/7.7\u003c\/li\u003e\n\u003cli\u003e5-element optical design with Lanthanum glass\u003c\/li\u003e\n\u003cli\u003eIncreases field of view by 43%\u003c\/li\u003e\n\u003cli\u003eMaintains EdgeHD flat-field imaging performance\u003c\/li\u003e\n\u003cli\u003eProvides a generous 146mm of back focus\u003c\/li\u003e\n\u003cli\u003eOptimized for a 42mm full-frame image circle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Reducer Lens .7x - EdgeHD 1100\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Reducer Lens .7x for the EdgeHD 1100 is a purpose-built, 5-element optical corrector that transforms your telescope into a faster, wider imaging system without compromising its acclaimed flat-field correction. This reducer provides a generous 146mm of back focus for complex imaging trains and increases your field of view by 43%, allowing you to capture expansive nebulae and galaxies within a 42mm full-frame image circle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 5-Element System to Maintain Flat-Field Correction\u003c\/h3\u003e\n\u003cp\u003eUnlike generic reducers that can introduce field curvature, this .7x reducer features a custom 5-element optical design engineered specifically to work with the EdgeHD 1100 system. It uses high-index Lanthanum glass elements to minimize chromatic aberration and preserve the pinpoint stars from the center to the edge of the field. All air-to-glass surfaces are fully multi-coated, and lens edges are blackened to ensure maximum light transmission and image contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e.7x Reduction for f\/7.7 Speed and a 43% Wider View\u003c\/h3\u003e\n\u003cp\u003eBy applying a .7x compression factor, this reducer lens effectively shortens your telescope's focal length, making it one full f-stop faster. This converts the EdgeHD 1100 from f\/10 to a speedier f\/7.7, cutting your required exposure time in half. This speed advantage is paired with a 43% increase in the field of view, enabling you to frame large deep-sky objects like the Andromeda Galaxy (M31) or the Orion Nebula (M42) in their entirety.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e146mm Back Focus for Full-Frame Sensors and Accessories\u003c\/h3\u003e\n\u003cp\u003eDesigned for modern astrophotography, the reducer provides 146mm (5.75\") of optimal back focus, accommodating a wide range of cameras, filter wheels, and off-axis guiders. It threads directly onto the EdgeHD 1100's 3.25\" rear cell, and its 60mm clear aperture ensures the 42mm image circle is fully illuminated without mechanical vignetting. This robust connection and generous spacing make it the ideal solution for imagers using full-frame DSLR, mirrorless, or dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the .7x reducer change the EdgeHD 1100's focal length and f-ratio?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Celestron .7x Reducer converts the EdgeHD 1100's native 2800mm focal length at f\/10 to approximately 1960mm at f\/7.7. This makes the system significantly faster, reducing exposure times by 50% for the same image brightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 146mm back focus on the EdgeHD 1100 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e146mm back focus\u003c\/strong\u003e provides ample space to install a full imaging train behind the reducer. This allows you to comfortably fit accessories like an off-axis guider (OAG), a filter wheel, and your camera without running out of spacing, a common issue with generic reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer work with my full-frame camera on the EdgeHD 1100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is designed with a large 60mm clear aperture to fully illuminate a 42mm image circle. This is large enough for full-frame sensors (typically 43mm diagonal), ensuring minimal vignetting and sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this dedicated reducer better than a generic SCT reducer for my EdgeHD 1100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA generic Schmidt-Cassegrain reducer is not designed to preserve the advanced, flat-field optical correction of the EdgeHD system. This dedicated \u003cstrong\u003e5-element reducer\u003c\/strong\u003e is optically matched to the EdgeHD 1100, ensuring it maintains the flat field and pinpoint stars while a generic reducer would likely reintroduce field curvature and other aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this reducer help when imaging large targets like the Andromeda Galaxy (M31) with an EdgeHD 1100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt its native focal length, an EdgeHD 1100 is too magnified to fit the entire Andromeda Galaxy (M31) in a single frame with most sensors. The reducer's \u003cstrong\u003e43% wider field of view\u003c\/strong\u003e makes it possible to capture the galaxy from core to outer arms, making it an essential accessory for wide-field deep-sky imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this reducer affect the flat-field correction of the EdgeHD 1100 optics?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is designed to maintain it. The primary purpose of this reducer's custom 5-element design is to reduce the focal length while preserving the coma-free, flat-field performance that is the hallmark of the EdgeHD optical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e5-Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Factor\u003c\/td\u003e\n\u003ctd\u003e.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimal Back Focus\u003c\/td\u003e\n\u003ctd\u003e146mm (5.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eLanthanum Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.25 lbs (1.47 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e.7x Reducer Lens for EdgeHD 1100\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Covers\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145865501,"sku":"CEL-94241","price":1180.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Reducer-Lens-7x-EdgeHD-1100-94241-1__77053.1594230247.1280.1280.jpg?v=1684337161"},{"product_id":"celestron-reducer-lens-7x-edgehd-1400","title":"Celestron Reducer Lens .7x - EdgeHD 1400","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces EdgeHD 1400 focal ratio by a factor of 0.7x\u003c\/li\u003e\n\u003cli\u003eCustom 5-element optical design preserves flat-field imaging\u003c\/li\u003e\n\u003cli\u003eProvides a generous 146mm of back focus for imaging equipment\u003c\/li\u003e\n\u003cli\u003eDelivers a 42mm image circle, fully illuminating full-frame sensors\u003c\/li\u003e\n\u003cli\u003eFeatures exotic Lanthanum glass elements to eliminate chromatic aberration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Reducer Lens .7x - EdgeHD 1400\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Reducer Lens .7x for the EdgeHD 1400 is an optically-matched corrector that transforms the telescope into a faster, wider imaging system without compromising its flat-field correction. Its 5-element design reduces the focal ratio from f\/11 to f\/7.7, increasing the field of view by 43% while cutting required exposure times in half. Engineered with 146mm of back focus and a 42mm image circle, this 3.25 lb reducer fully accommodates large, full-frame CCD and DSLR cameras with accessories like filter wheels and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e5-Element Optics: Maintaining Flat-Field EdgeHD Correction\u003c\/h3\u003e\n\u003cp\u003eUnlike a generic reducer, this 5-element lens is designed specifically to work with the EdgeHD 1400's optical system, ensuring the field remains perfectly flat from corner to corner on the sensor. Celestron uses high-index, \"rare earth\" Lanthanum glass elements to provide high-contrast views and minimize chromatic aberration, delivering sharp stars with no color fringing. All air-to-glass surfaces are fully multi-coated for maximum light transmission, while blackened lens edges prevent internal reflections from reducing image contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging at f\/7.7: A 43% Wider Field and Halved Exposure Times\u003c\/h3\u003e\n\u003cp\u003eThe primary purpose of the 0.7x reducer is to make the EdgeHD 1400 a more capable deep-sky imaging instrument. By reducing the focal length, it increases the true field of view by 43%, allowing you to frame large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety. This reduction also makes the telescope one full f-stop faster, reducing the required imaging exposure time by half to achieve the same signal-to-noise ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e146mm Back Focus: Integrating Full-Frame Cameras and Accessories\u003c\/h3\u003e\n\u003cp\u003eA critical advantage of this reducer is its substantial 146mm (5.75\") of optimal back focus, providing ample space for complex imaging trains. This allows you to easily incorporate accessories like an off-axis guider, filter wheel, or adaptive optics system without struggling to reach focus. The optical design delivers a corrected 42mm image circle, which is large enough to fully illuminate even full-frame sensors without vignetting, making it a professional-grade solution for serious astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Design: A 60mm Aperture with a 3.25\" Thread-On Interface\u003c\/h3\u003e\n\u003cp\u003eThe reducer's housing is CNC machined from aluminum for precise optical alignment and thermal stability. It threads directly onto the large 3.25\" port on the rear cell of the EdgeHD 1400, creating a rigid, flexure-free connection that prevents mechanical vignetting. With a clear aperture of 60mm, the reducer ensures that the full 42mm corrected image circle reaches the sensor, maximizing the performance of your telescope and camera system. Threaded metal covers are included to protect the optics from dust and scratches when not in use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the EdgeHD 1400 .7x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer makes the telescope \"faster\" and \"wider.\" It reduces the focal ratio from f\/11 to a faster f\/7.7, which cuts your exposure times in half. It also increases the field of view by 43%, allowing you to capture larger deep-sky objects that would not fit in the frame at the native focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set the correct 146mm back focus for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 146mm distance is measured from the rear flange of the reducer to your camera's sensor. You will need to use a combination of T-adapters and extension tubes to achieve this precise spacing. You must account for the optical path length of any accessories, such as an off-axis guider or filter wheel, when calculating the required extensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this reducer with a full-frame camera on my EdgeHD 1400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. This reducer is designed to produce a \u003cstrong\u003e42mm corrected image circle\u003c\/strong\u003e, which is large enough to cover a standard 35mm full-frame sensor (which has a ~43mm diagonal) without significant vignetting or loss of star quality at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer work on an 11\" or 9.25\" EdgeHD telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Each EdgeHD reducer is optically matched to a specific telescope aperture to maintain the system's flat-field correction. Using the 14\" reducer on a smaller EdgeHD telescope will result in poor image quality. You must use the reducer designed for your specific model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the .7x Reducer affect imaging the Orion Nebula (M42) with an EdgeHD 1400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the reducer, you can capture the full expanse of the Orion Nebula, including its faint outer wings and the nearby Running Man Nebula (NGC 1977), in a single frame. At the native f\/11, you would only be able to frame the core Trapezium region, requiring a multi-panel mosaic to capture the entire complex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the EdgeHD 1400 Reducer compatible with the Fastar system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is used on the rear cell of the telescope for f\/7.7 imaging. The Fastar system operates independently by replacing the secondary mirror for ultra-fast f\/2 imaging. Together, they make the EdgeHD 1400 an incredibly versatile imaging platform, offering three distinct focal ratios in one telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e5-Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Factor\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimal Back Focus\u003c\/td\u003e\n\u003ctd\u003e146mm (5.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection to Telescope\u003c\/td\u003e\n\u003ctd\u003e3.25\" Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.25 lbs (1.47 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eReducer Lens .7x for EdgeHD 1400\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Cap (Front)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Cap (Rear)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_EdgeHD_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload EdgeHD Reducer Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-EdgeHD-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload EdgeHD Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145931037,"sku":"CEL-94240","price":1180.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Reducer-Lens-7x-EdgeHD-1400-94240-1__12070.1594230248.1280.1280.jpg?v=1684337166"},{"product_id":"celestron-reducer-lens-7x-edgehd-800","title":"Celestron Reducer Lens .7x - EdgeHD 800","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal length by a factor of 0.7x, changing the EdgeHD 800 from f\/10 to f\/7\u003c\/li\u003e\n\u003cli\u003e4-element optical design maintains the native flat-field performance of the EdgeHD system\u003c\/li\u003e\n\u003cli\u003eIncreases the field of view by 43%, ideal for capturing large celestial objects\u003c\/li\u003e\n\u003cli\u003eProvides a generous 105mm of back focus for compatibility with a wide range of cameras and accessories\u003c\/li\u003e\n\u003cli\u003eFully multi-coated optics with Lanthanum glass elements maximize light transmission and minimize chromatic aberration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Reducer Lens .7x - EdgeHD 800\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Reducer Lens .7x for the EdgeHD 800 is a custom-engineered 4-element optical accessory that transforms the telescope's native f\/10 system into a faster f\/7 instrument. This 0.7x compression factor increases the field of view by 43%, allowing you to capture expansive nebulae and galaxies within a single frame. The design provides a substantial 105mm of back focus, accommodating complex imaging trains with filter wheels, off-axis guiders, and a wide variety of dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 4-Element Design for Flat-Field Imaging\u003c\/h3\u003e\n\u003cp\u003eUnlike a generic reducer, the Celestron .7x Reducer is engineered specifically to work with the EdgeHD 800's optical system. Its 4-element design, which incorporates high-index Lanthanum glass, maintains the flat-field, coma-free performance the EdgeHD is known for, ensuring sharp stars from the center to the edge of the frame. All air-to-glass surfaces are fully multi-coated to maximize light transmission and eliminate chromatic aberration, preserving the high-contrast views of the original optical design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 43% Wider Field and 0.7x Faster Exposures\u003c\/h3\u003e\n\u003cp\u003eBy reducing the focal length, this accessory widens your field of view by 43%, making it possible to frame large targets like the Andromeda Galaxy (M31) or the Orion Nebula (M42) in their entirety. This focal reduction also makes the optical system one full f-stop faster, cutting required exposure times in half. You can gather the same amount of signal in a 5-minute sub-exposure as you would in a 10-minute exposure at f\/10, reducing demands on your mount's tracking and minimizing noise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC Machined Housing and 105mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe reducer's housing is CNC machined from aluminum for precise optical alignment and spacing, critical for maintaining image quality. A key feature is the generous 105mm of optimal back focus, measured from the reducer's rear flange. This provides ample room for accessories like off-axis guiders, filter wheels, and adaptive optics systems without compromising the flat-field correction, a significant advantage over reducers with shorter back focus requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe f\/7 Midpoint for the EdgeHD 800\u003c\/h3\u003e\n\u003cp\u003eThe .7x Reducer gives your EdgeHD 800 a versatile f\/7 focal ratio, creating a three-in-one imaging platform. This provides a crucial intermediate step between the telescope's native f\/10 for high-resolution planetary and small galaxy imaging, and the ultra-fast f\/2 ratio available with the optional HyperStar accessory for wide-field surveys. This flexibility makes the EdgeHD 800, equipped with the .7x reducer, one of the most complete imaging systems available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 105mm back focus on the EdgeHD 800 Reducer mean for my imaging setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 105mm back focus is the required distance from the reducer's rear mounting flange to your camera's sensor for optimal flat-field performance. This generous distance allows you to easily install accessories like an off-axis guider (OAG), filter wheel, and various adapters in your imaging train while still hitting the correct spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the .7x Reducer help when imaging the Andromeda Galaxy (M31) with an EdgeHD 800?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt its native f\/10 focal length, an EdgeHD 800 is too magnified to capture the full Andromeda Galaxy. The .7x Reducer increases the field of view by 43%, allowing you to frame the entire galaxy and its companions, M32 and M110, in a single shot with an APS-C or smaller sensor. It also reduces exposure time, making it easier to capture the faint outer dust lanes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer work with a full-frame camera on my EdgeHD 800?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the EdgeHD 800 optical tube has a 42mm illuminated image circle capable of covering a full-frame sensor, using this 0.7x reducer will shrink the optimized image circle to 26.7mm. This is ideal for APS-C sensors (like those in many DSLRs) and smaller dedicated astronomy cameras, but it will cause significant vignetting on a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron .7x Reducer better than a generic focal reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Generic reducers are not designed to correct for the specific field curvature of the EdgeHD optical system. The Celestron .7x Reducer uses a custom 4-element design to maintain the flat, coma-free field across the entire image, ensuring sharp stars to the corners where a generic reducer would show distortion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much faster is imaging with the EdgeHD 800 Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer changes the telescope's focal ratio from f\/10 to f\/7. This is one full f-stop faster, which means it cuts the required exposure time in half. For example, a 10-minute exposure at f\/10 can be achieved in just 5 minutes at f\/7 with the same image brightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need any special adapters to connect my DSLR to the .7x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. You will need a T-ring for your specific camera brand (e.g., Canon, Nikon) and a T-adapter that provides the correct spacing to achieve the 105mm back focus. Celestron offers T-adapters designed for the EdgeHD series that simplify this process.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Factor\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Types\u003c\/td\u003e\n\u003ctd\u003eLanthanum Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimal Back Focus\u003c\/td\u003e\n\u003ctd\u003e105mm (4.13\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e26.7mm (with reducer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.8 lbs (0.36 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eReducer Lens .7x - EdgeHD 800\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Cap (Front)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Cap (Rear)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_.7x_Reducer_for_EdgeHD_800_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Reducer Lens .7x for EdgeHD 800 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145963805,"sku":"CEL-94242","price":582.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Reducer-Lens-7x-EdgeHD-800-94242-1__43771.1594230248.1280.1280.jpg?v=1684337171"},{"product_id":"celestron-reducer-lens-7x-edgehd-925","title":"Celestron Reducer Lens .7x - EdgeHD 925","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio by a factor of 0.7x for faster imaging\u003c\/li\u003e\n\u003cli\u003e4-element design maintains the native flat-field performance of the EdgeHD 9.25\"\u003c\/li\u003e\n\u003cli\u003eProvides an optimal back focus of 146mm for cameras and accessories\u003c\/li\u003e\n\u003cli\u003eOptimized for a 42mm image circle to illuminate full-frame sensors\u003c\/li\u003e\n\u003cli\u003eFeatures Lanthanum glass elements to minimize chromatic aberration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Reducer Lens .7x - EdgeHD 925\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Reducer Lens .7x for the EdgeHD 9.25\" is a custom-engineered 4-element optic that transforms your telescope into a faster, wider imaging system. This reducer provides a generous 146mm of back focus, allowing complex imaging trains while maintaining the award-winning flat-field correction of the EdgeHD optical design from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 0.7x Reduction Factor with 4-Element Flat-Field Correction\u003c\/h3\u003e\n\u003cp\u003eThis dedicated reducer converts your f\/10 EdgeHD 9.25\" into an f\/7 system, effectively cutting your required exposure time in half to achieve the same image brightness. The 4-element optical layout is specifically designed to work with the EdgeHD optics, ensuring the pinpoint stars across a flat field are preserved. This means you can capture wide-field images of large galaxies and nebulae with a 43% wider field of view without sacrificing image quality at the edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLanthanum Glass Elements for High-Contrast Imaging\u003c\/h3\u003e\n\u003cp\u003eUnlike generic reducers, the Celestron .7x Reducer uses high-index, exotic Lanthanum glass elements. This \"rare earth\" glass provides superior correction of chromatic aberration, resulting in images with higher contrast and neutral color balance. All air-to-glass surfaces are fully multi-coated for maximum light transmission, and the lens edges are blackened to eliminate internal reflections that can reduce image contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Ready with 146mm of Optimal Back Focus\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern astrophotography, this reducer features a 60mm clear aperture and produces an optimized 42mm image circle, fully illuminating large full-frame CCD and CMOS sensors without vignetting. It threads directly onto the EdgeHD 9.25\" optical tube's 3.25\" port, creating a rigid connection. The design provides an optimal back focus distance of 146mm, accommodating accessories like off-axis guiders, filter wheels, and a wide range of cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the Celestron .7x Reducer for my EdgeHD 9.25\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is speed. By converting your telescope from f\/10 to f\/7, it reduces your exposure time by 50%. It also widens your field of view by 43%, allowing you to fit larger celestial objects, like the Andromeda Galaxy (M31), into a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a dedicated EdgeHD reducer better than a generic one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe EdgeHD optical design produces a very flat, coma-free field. A generic reducer is not designed to preserve this correction and will introduce field curvature and other aberrations. The Celestron .7x Reducer is a \u003cstrong\u003e4-element\u003c\/strong\u003e system custom-designed to work with the EdgeHD 9.25\" optics to maintain its signature flat-field performance across the entire image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Celestron .7x Reducer help when imaging the Orion Nebula (M42) with an EdgeHD 925?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Orion Nebula (M42) is a large and bright target. The \u003cstrong\u003e0.7x\u003c\/strong\u003e reduction allows you to capture the full expanse of the nebula, including its fainter outer structures, in a single shot. The faster f\/7 focal ratio significantly shortens the sub-exposure times needed to capture the faint details without blowing out the bright core of the Trapezium cluster.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 146mm back focus on the EdgeHD 925 reducer allow me to do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e146mm\u003c\/strong\u003e back focus is the distance required from the reducer's rear flange to your camera sensor for optimal performance. This generous distance provides ample room to install a full imaging train, including an off-axis guider (OAG), a filter wheel, and any necessary adapters, without running out of space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer work with a full-frame camera on my EdgeHD 9.25\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is designed with a \u003cstrong\u003e60mm clear aperture\u003c\/strong\u003e and produces a \u003cstrong\u003e42mm image circle\u003c\/strong\u003e. This is large enough to fully illuminate typical full-frame sensors (which have a diagonal of ~43mm) with minimal vignetting, making it an excellent choice for full-frame imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it difficult to attach the .7x Reducer to the EdgeHD 9.25\" telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it's straightforward. The reducer threads directly onto the large 3.25\" threaded baffle tube port on the rear cell of the EdgeHD 9.25\". This provides a secure, flexure-free connection that is essential for sharp imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Factor\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimal Back Focus\u003c\/td\u003e\n\u003ctd\u003e146mm (5.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eLanthanum Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing\u003c\/td\u003e\n\u003ctd\u003eMachined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.3 lbs (1.47 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eReducer Lens .7x for EdgeHD 9.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Cap (Front)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eThreaded Metal Dust Cap (Rear)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967146029341,"sku":"CEL-94245","price":610.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Reducer-Lens-7x-EdgeHD-925-94245-1__58642.1594230249.1280.1280.jpg?v=1684337176"},{"product_id":"sky-watcher-quattro-coma-corrector","title":"Sky-Watcher Quattro Coma Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects coma in fast Newtonian telescopes\u003c\/li\u003e\n\u003cli\u003eDelivers pinpoint stars across the entire field of view\u003c\/li\u003e\n\u003cli\u003eMaintains the telescope's native focal length and magnification\u003c\/li\u003e\n\u003cli\u003eOptimized for wide-field astrophotography\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Quattro Coma Corrector\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Quattro Coma Corrector is an essential optical accessory engineered to eliminate the inherent comatic aberration in fast Newtonian astrographs. It delivers stunningly sharp, pinpoint stars from the center to the very edge of the field of view. This corrector ensures that the native focal length and magnification of your telescope remain completely unaltered, preserving your original image scale for wide-field astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEliminate Coma for Edge-to-Edge Field Sharpness\u003c\/h3\u003e\n\u003cp\u003eFast Newtonian reflectors, like the Sky-Watcher Quattro series, produce a visual artifact known as coma, which distorts stars at the edge of the field into comet-like shapes. The Quattro Coma Corrector's optical design specifically counteracts this aberration, transforming distorted peripheral stars into the sharp, round points required for high-resolution imaging. This allows you to use your entire imaging sensor without cropping away compromised data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePreserve Your Telescope's Native Magnification\u003c\/h3\u003e\n\u003cp\u003eUnlike reducer\/correctors that shorten your telescope's focal length, the Sky-Watcher Quattro Coma Corrector functions at a 1x magnification. This is a critical feature for imagers who have carefully matched their camera and telescope for an optimal image scale. You get the full benefit of coma correction without changing the field of view or resolution your optical system was designed for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptimized for Wide-Field Imaging\u003c\/h3\u003e\n\u003cp\u003eThis corrector is designed to illuminate large imaging sensors, making it the ideal match for wide-field targets like the Andromeda Galaxy (M31) or the vast hydrogen clouds of the North American Nebula (NGC 7000). By ensuring the entire corrected field is sharp, the Quattro Coma Corrector enables you to produce clean, professional-grade astrophotographs that are free of distracting optical errors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary function of the Sky-Watcher Quattro Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary function of the Sky-Watcher Quattro Coma Corrector is to correct for \u003cstrong\u003ecoma\u003c\/strong\u003e, an optical aberration inherent in fast Newtonian telescopes. This results in sharp, pinpoint stars across the entire photographic field, especially near the edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Quattro Coma Corrector change my telescope's focal ratio?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The Sky-Watcher Quattro Coma Corrector is a \u003cstrong\u003e1x corrector\u003c\/strong\u003e, which means it does not alter the telescope's native focal length or focal ratio. Your f\/4 telescope will remain f\/4, preserving your original image scale and field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Quattro Coma Corrector improve my images of the Rho Ophiuchi cloud complex with an f\/4 Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen imaging a dense, wide starfield like the Rho Ophiuchi region with a fast f\/4 Newtonian, stars at the edge of the frame would normally appear stretched and comet-shaped due to coma. The Quattro Coma Corrector corrects this, ensuring that the thousands of stars in the field, from the bright star Antares to the faintest background members, are rendered as sharp, round points across your entire sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Sky-Watcher Quattro Coma Corrector only for Sky-Watcher telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is optically matched for the Sky-Watcher Quattro series of imaging Newtonians, this coma corrector can often be used successfully with other fast Newtonian telescopes. However, achieving optimal results depends on matching the corrector's required back focus, which may require additional spacers or adapters for non-Quattro telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a coma corrector for visual observing, or is it just for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile coma is most obvious in astrophotography, it is also visible through an eyepiece, especially with low-power, wide-field eyepieces. Using the Sky-Watcher Quattro Coma Corrector for visual work can provide a more pleasing, \"refractor-like\" view, with sharp stars across the entire field of view, not just in the center.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to add spacers to achieve the correct back focus with the Quattro Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAchieving the correct back focus (the distance from the corrector's flange to the camera sensor) is critical for its performance. Whether you need spacers depends on your specific camera and imaging train configuration. The corrector is designed to reach focus with standard DSLRs and dedicated astronomy cameras, but you should always confirm the required back focus distance for your setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector Type\u003c\/td\u003e\n\u003ctd\u003eComa Corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e1x (Unaltered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Application\u003c\/td\u003e\n\u003ctd\u003eAstrophotography with fast Newtonian Telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSky-Watcher Quattro Coma Corrector\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967191675165,"sku":"SW-S20204","price":680.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Sky-Watcher-Quattro-Coma-Corrector-S20204-1__76015.1594170794.1280.1280.jpg?v=1684338537"},{"product_id":"explore-scientific-3-field-flattener-7x-focal-reducer","title":"Explore Scientific 3\" Field Flattener .7x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio by a factor of 0.7x for wider fields and shorter exposures\u003c\/li\u003e\n\u003cli\u003eFunctions as a field flattener to correct edge-of-field aberrations\u003c\/li\u003e\n\u003cli\u003eEngineered for Explore Scientific 127mm and 152mm APO refractors\u003c\/li\u003e\n\u003cli\u003eRequires a precise 55mm back focus from the rear of the unit\u003c\/li\u003e\n\u003cli\u003eFeatures fully multi-coated optics for maximum light transmission\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 3\" Field Flattener .7x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 3\" Field Flattener and 0.7x Focal Reducer is an essential imaging accessory that corrects optical aberrations while simultaneously speeding up your photographic system. Designed for Explore Scientific's 127mm and 152mm refracting telescopes, it transforms a native f\/8 instrument into a faster f\/5.6 imaging platform, reducing exposure times by nearly 50%. This corrector provides a critical 55mm of back focus and is confirmed to deliver excellent results with refractors operating at both f\/8 and f\/7.5.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual-Function Optics: A 0.7x Reducer for Faster Imaging\u003c\/h3\u003e\n\u003cp\u003eThis accessory performs two critical roles for the astrophotographer. As a focal reducer, its 0.7x magnification factor makes your telescope optically \"faster,\" widening your field of view and concentrating starlight onto your camera's sensor. This allows you to capture faint details with significantly shorter exposure times and fit larger deep-sky objects, like the Andromeda Galaxy (M31), into a single frame.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Field of View:\u003c\/strong\u003e Capture expansive nebulae and large star clusters without creating a mosaic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter Images:\u003c\/strong\u003e By reducing the f-ratio, the reducer increases image brightness, improving your signal-to-noise ratio in less time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-Coated:\u003c\/strong\u003e High-transmission coatings on all optical surfaces ensure that the maximum amount of light reaches your sensor, preserving contrast and detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTack-Sharp Stars to the Edge of the Field\u003c\/h3\u003e\n\u003cp\u003eRefractor telescopes naturally create a curved focal plane, which means that while the center of your image may be in perfect focus, stars towards the corners can appear elongated and soft. This 3\" field flattener is engineered to counteract this effect, producing a flat, corrected field of view that is essential for modern high-resolution sensors. The result is crisp, pinpoint stars from one edge of the frame to the other.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAchieving 55mm Back Focus with Explore Scientific Focusers\u003c\/h3\u003e\n\u003cp\u003eProper spacing is the most critical element for any flattener or reducer. This unit requires a precise sensor distance of 55mm, measured from the rear face of the reducer housing. The included M42x0.75 T-thread adapter consumes 3mm of this distance, meaning your camera sensor must be placed exactly 52mm from the shoulder of the T-adapter. This accessory includes an adapter for the Explore Scientific 2-inch rack-and-pinion focuser, but connecting to the 2.5-hex focuser on the 127mm APO requires a separate adapter (part #510366).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for the ES 3\" 0.7x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is \u003cstrong\u003e55mm\u003c\/strong\u003e, measured from the rear flange of the reducer unit itself. The standard M42x0.75 T-thread adapter uses 3mm of this distance, leaving you with a \u003cstrong\u003e52mm\u003c\/strong\u003e spacing requirement between the adapter and your camera's sensor. This is a common distance for DSLR cameras with a standard T-ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Explore Scientific telescopes are compatible with this 3\" 0.7x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer\/flattener is specifically recommended for the Explore Scientific \u003cstrong\u003e127mm and 152mm APO triplet refractors\u003c\/strong\u003e. It is not designed for use with their doublet refractors. It has been tested and confirmed to perform exceptionally well with optical systems at both f\/8 and f\/7.5.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a special adapter for my Explore Scientific 127mm APO refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, most likely. The ES 127mm APO refractor typically ships with a 2.5-hex focuser. To connect this 3\" reducer, you must purchase the specific adapter, part number \u003cstrong\u003e510366\u003c\/strong\u003e. The reducer does include an adapter for the Explore Scientific 2-inch rack-and-pinion focuser, but this is not the standard focuser on the 127mm model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 0.7x reduction help when imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 0.7x reduction provides a wider field of view, which is essential for framing large emission nebulae like the North American Nebula (NGC 7000) in their entirety, especially with larger sensors. It also makes your telescope faster (e.g., f\/8 becomes f\/5.6), significantly reducing the exposure time needed to capture the faint, expansive clouds of hydrogen-alpha gas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between a focal reducer and a field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis accessory combines both functions, but they solve different problems:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA \u003cstrong\u003eFocal Reducer\u003c\/strong\u003e shortens the effective focal length of your telescope. This makes the image brighter and the field of view wider.\u003c\/li\u003e\n\u003cli\u003eA \u003cstrong\u003eField Flattener\u003c\/strong\u003e corrects for the natural curvature of a refractor's focal plane, ensuring stars are sharp and round across the entire image, not just in the center.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific 3\" reducer for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis device is designed and optimized specifically for astrophotography. Its optical corrections are calculated to produce a flat field on a camera sensor at a precise 55mm distance. It is not intended for visual use with an eyepiece and will not perform as a standard visual accessory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Type\u003c\/td\u003e\n\u003ctd\u003eField Flattener \u0026amp; Focal Reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Reduction\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e55mm from rear face of unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 T-Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Telescopes\u003c\/td\u003e\n\u003ctd\u003eExplore Scientific 127mm \u0026amp; 152mm APOs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended F-Ratios\u003c\/td\u003e\n\u003ctd\u003ef\/7.5 to f\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptics\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014408\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198720285,"sku":"ES-FFFR507X-00","price":559.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-3-inch-Field-Flattener-7x-Focal-Reducer-FFFR507X-00-FFFR507X-00-1__88587.1594240338.1280.1280.jpg?v=1684338681"},{"product_id":"william-optics-adjustable-flat61-for-z61","title":"William Optics Adjustable Flat61 for Z61","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.0x Flattener Power\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics Zenithstar 61\u003c\/li\u003e\n\u003cli\u003eFull-Frame Sensor Coverage\u003c\/li\u003e\n\u003cli\u003eAdjustable Back Focus Mechanism\u003c\/li\u003e\n\u003cli\u003eM54 Telescope Thread \u0026amp; M48 Camera Thread\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Adjustable Flat61 for Z61\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Adjustable Flat61 is the definitive imaging accessory for the Zenithstar 61, delivering edge-to-edge pinpoint stars on sensors up to full-frame format at a native 1.0x power. Its 2-element, 2-group optical design corrects the field curvature inherent in a fast refractor, connecting to the telescope via a rigid M54 x 0.75 thread and to your camera with a standard M48 x 0.75 T-mount. Weighing just 272.8 g, the unit's optical path consists of the 39.5 mm flattener body and a 19 mm rotator and adapter section, engineered for precise spacing and image composition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1.0x Power for Full-Frame Correction with the Zenithstar 61\u003c\/h3\u003e\n\u003cp\u003eThis flattener corrects field curvature without altering the native focal length or focal ratio of your Z61 telescope. The 1.0x magnification ensures the field of view you framed visually is the same one you capture, preserving the telescope's original optical characteristics. The 2-element in 2-group lens design is optimized specifically for the Z61's optics, providing a flat, corrected image circle large enough to accommodate full-frame (36x24mm) sensors without vignetting or distorted stars at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM54 Telescope Connection \u0026amp; M48 Camera Interface\u003c\/h3\u003e\n\u003cp\u003eThe Flat61A attaches to the Z61 focuser using a robust M54 x 0.75 threaded connection, eliminating any potential for tilt or flex that can occur with simple compression fittings. The camera side features the astrophotography standard M48 x 0.75 thread, providing a wide, secure aperture for filters and direct connection to dedicated astronomy cameras and a broad range of DSLR\/mirrorless T-mounts. The integrated rotator allows you to frame your target perfectly without loosening any threaded connections, maintaining rigid alignment throughout your imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAdjustable Back Focus for Edge-to-Edge Sharpness\u003c\/h3\u003e\n\u003cp\u003eAchieving a perfectly flat field requires precise spacing between the flattener's rear element and the camera sensor. While fixed-length flatteners work well with a specific camera setup, the Adjustable Flat61 acknowledges that filter wheels, off-axis guiders, or different T-ring thicknesses can alter this critical distance. This unit's key feature is its ability to be fine-tuned, allowing you to dial in the exact back focus required by your unique imaging train to guarantee sharp stars across the entire frame, not just in the center.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the William Optics Adjustable Flat61?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Flat61A is an optical corrector designed specifically for the William Optics Zenithstar 61 refractor. It flattens the curved focal plane of the telescope, ensuring that stars are sharp and pinpoint across the entire field of view, from the center to the corners of your camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect the Flat61A to my Z61 and camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe flattener connects directly to the Z61 focuser's drawtube via a secure \u003cstrong\u003eM54 x 0.75 thread\u003c\/strong\u003e. The camera side features a standard \u003cstrong\u003eM48 x 0.75 thread\u003c\/strong\u003e, which is compatible with most dedicated astronomy cameras, filter wheels, and T-mounts for DSLR and mirrorless cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is an adjustable flattener like the Flat61A better than a fixed one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn adjustable flattener provides the flexibility to achieve perfect back focus with various imaging setups. Different cameras, filter thicknesses, and adapters can slightly change the ideal spacing. The Flat61A allows you to fine-tune this distance, ensuring optimal optical correction regardless of the specific components in your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Flat61A change the focal length of my Zenithstar 61?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The William Optics Flat61A is a \u003cstrong\u003e1.0x flattener\u003c\/strong\u003e, meaning it does not reduce or extend the telescope's focal length. It corrects for optical aberrations while preserving the Z61's native field of view and f-ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the William Optics Flat61A with a full-frame camera like the Sony A7 series on my Z61?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Flat61A is explicitly designed to provide a corrected image circle for \u003cstrong\u003eFull Frame\u003c\/strong\u003e sensors. With the appropriate M48 T-mount for Sony E-mount cameras (listed in the supported T-mounts), you can achieve a flat field with your Sony A7 series camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Flat61A provide a flat field for imaging the Andromeda Galaxy (M31) with my Z61 and an APS-C camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The flattener is designed for sensors up to full-frame, so it will provide excellent correction for smaller \u003cstrong\u003eAPS-C\u003c\/strong\u003e and \u003cstrong\u003eM4\/3\u003c\/strong\u003e sensors. It will ensure that all the stars across the vast expanse of the Andromeda Galaxy (M31) are rendered as sharp points.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Power\u003c\/td\u003e\n\u003ctd\u003e1.0x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e2 Elements in 2 Groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Format Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eM54 x 0.75 x 5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 x 4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Path Components\u003c\/td\u003e\n\u003ctd\u003eFlattener 39.5 mm + Rotator\/Adapter 19 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported T-Mounts\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4\/3); FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e272.8 g (0.60 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967219822877,"sku":"WO-P-FLAT61A","price":384.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-Adjustable-Flat61-for-Z61-P-FLAT61A-1__32465.1596133236.1280.1280.jpg?v=1684339110"},{"product_id":"william-optics-adjustable-reducer-flattener-flat61r-for-z61","title":"William Optics Adjustable Reducer Flattener Flat61R for Z61","description":"\u003cul\u003e\n\t\u003cli\u003eAdjustable reducer and field flattener for William Optics Z61 telescope\u003c\/li\u003e\n\t\u003cli\u003eImproves image sharpness and reduces distortion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\t\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\t\u003cli class=\"active\"\u003e\n\t\t\u003cp\u003e\nThe William Optics Adjustable Reducer Flattener Flat61R is an essential accessory for the William Optics Z61 telescope. This adjustable reducer and field flattener enhances image sharpness and reduces distortion, ensuring high-quality astrophotography results.\n\t\t\u003c\/p\u003e\n\t\t\u003cdiv class=\"warning\"\u003e\n\t\t\t\u003cimg alt=\"Disclaimer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/warning-logo.svg?v=1714663206\" width=\"25px\"\u003e\n\t\t\t\u003cp\u003e\nSpecifically designed for the William Optics Z61 telescope.\n\t\t\t\u003c\/p\u003e\n\t\t\u003c\/div\u003e\n\t\t\n\t\t\u003cdiv\u003e\n\t\t\t\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\t\t\t\u003chr\u003e\n\t\t\t\u003cdiv class=\"two-columns-section\"\u003e\n\t\t\t\t\u003cdiv class=\"text-side-2\"\u003e\n\t\t\t\t\t\u003cp\u003e\nThe Flat61R is designed to perfectly fit the William Optics Z61 telescope. It ensures a seamless connection, enhancing the optical performance of your telescope.\n\t\t\t\t\t\u003c\/p\u003e\n\t\t\t\t\u003c\/div\u003e\n\t\t\t\t\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\t\t\t\t\t\u003cimg alt=\"William Optics Adjustable Reducer Flattener Flat61R for Z61\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/William-Optics-Adjustable-Reducer-Flattener-Flat61R-for-Z61-P-FLAT61R-2__19145.1596133238.1280.1280_832x832.jpg?v=1684339301\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\t\t\t\t\u003c\/div\u003e\n\t\t\t\u003c\/div\u003e\n\n\t\t\t\u003cdiv data-mce-style=\"backgroundcolor: #0a0001; border-radius: 5px;\" style=\"background-color: #0a0001; border-radius: 5px;\"\u003e\n\t\t\t\t\u003ch3 style=\"color: white!important;\"\u003eEnhanced Image Quality\u003c\/h3\u003e\n\t\t\t\t\u003chr\u003e\n\t\t\t\t\u003cdiv class=\"two-columns-section\"\u003e\n\t\t\t\t\t\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\t\t\t\t\t\t\u003cimg alt=\"William Optics Adjustable Reducer Flattener Flat61R for Z61\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/William-Optics-Adjustable-Reducer-Flattener-Flat61R-for-Z61-P-FLAT61R-8__83135.1596133238.1280.1280_832x832.jpg?v=1684339311\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\t\t\t\t\t\u003c\/div\u003e\n\t\t\t\t\t\u003cdiv class=\"text-side-2\"\u003e\n\t\t\t\t\t\t\u003cp style=\"color: white!important;\"\u003e\nThe adjustable reducer flattener improves image sharpness across the field, reducing optical aberrations and ensuring crisp, clear images of celestial objects.\n\t\t\t\t\t\t\u003c\/p\u003e\n\t\t\t\t\t\u003c\/div\u003e\n\t\t\t\t\u003c\/div\u003e\n\t\t\t\u003c\/div\u003e\n\t\t\u003c\/div\u003e\n\n\t\t\u003ch3\u003eAdjustable Design\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nThe Flat61R features an adjustable design, allowing users to fine-tune the distance to the camera sensor for optimal performance, ensuring perfect star shapes across the entire image.\n\t\t\u003c\/p\u003e\n\t\t\n\t\t\u003ch3\u003eDurable Construction\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nMade from high-quality materials, such as anodized aluminum, the Flat61R is built to last, providing durability and stability for all your astrophotography needs.\n\t\t\u003c\/p\u003e\n\n\t\t\u003ch3\u003ePrecision Engineering\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nThe Flat61R is engineered with precision to ensure a tight and secure fit, minimizing any unwanted movement or vibrations and enhancing overall image quality.\n\t\t\u003c\/p\u003e\n\n\t\t\u003ch3\u003eEase of Use\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nDesigned for easy attachment and detachment, the Flat61R allows users to quickly set up or dismantle their equipment as needed, making it convenient for field use.\n\t\t\u003c\/p\u003e\n\n\t\t\u003ch3\u003eVersatility\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nIdeal for both astrophotography and observational astronomy, the Flat61R provides the necessary optical enhancements for detailed and high-quality imaging.\n\t\t\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967220019485,"sku":"WO-P-FLAT61R","price":409.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-Adjustable-Reducer-Flattener-Flat61R-for-Z61-P-FLAT61R-1__95363.1596133238.1280.1280.jpg?v=1684339299"},{"product_id":"william-optics-flattener-68iii","title":"William Optics Flattener 68III","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.0x Flattener Power preserves native focal length\u003c\/li\u003e\n\u003cli\u003eCorrects field curvature for Full Frame sensors\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics FLT132, GT102, and GT153 refractors\u003c\/li\u003e\n\u003cli\u003eConnects via a robust M92 telescope-side thread\u003c\/li\u003e\n\u003cli\u003eFeatures a standard M48 camera-side thread to prevent vignetting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Flattener 68III\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Flattener 68III is an essential imaging accessory designed to deliver perfectly flat fields across full-frame sensors without altering your telescope's native focal length. This 1.0x flattener connects directly to the focuser of premier William Optics refractors like the FLT132, GT102, and GT153 via a secure M92 x 1 thread. Its efficient 2-element optical design corrects for field curvature, ensuring pinpoint stars from the center to the corners of your frame, while the M48 camera connection minimizes vignetting for modern DSLR and dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1.0x Flattening: Edge-to-Edge Correction for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThis flattener is engineered for the imaging purist. With a 1.0x power factor, it maintains your telescope's exact focal length and f-ratio, preserving the original image scale for maximum resolution on planetary and small deep-sky targets. The optical system, comprised of 2 elements in 2 groups, is fully multi-coated to ensure high light transmission and contrast, turning the curved focal plane of a fast refractor into a flat, corrected surface ready for large sensors.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Frame Illumination:\u003c\/strong\u003e Designed to fully illuminate and correct sensors up to a 44mm diagonal, making it ideal for full-frame (24x36mm), APS-C, and M4\/3 formats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePinpoint Stars:\u003c\/strong\u003e Eliminates the elongated, comatic stars typically seen at the edges of uncorrected images, producing sharp, round stars across your entire field of view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreserves Native Scale:\u003c\/strong\u003e Unlike a reducer, this flattener allows you to image at your telescope's maximum magnification and resolution, ideal for detailed studies of galaxies and nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM92 Interface: Optimized for William Optics FLT and GT Refractors\u003c\/h3\u003e\n\u003cp\u003eThe Flattener 68III creates a seamless, rigid connection with specific William Optics telescopes. It threads directly onto the M92 drawtube of the FLT132, GT102, and GT153 refractors, ensuring perfect alignment and eliminating any potential for flexure in the imaging train. This robust mechanical design is critical for supporting heavier camera packages.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope Connection:\u003c\/strong\u003e The M92 x 1 male thread provides a secure, direct-fit attachment to compatible William Optics focusers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Connection:\u003c\/strong\u003e A standard M48 x 0.75 female thread on the camera side offers a wider aperture than older T2 (M42) threads, preventing vignetting on full-frame sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad Camera Support:\u003c\/strong\u003e Compatible with standard M48 T-rings for Canon, Nikon, Sony, Pentax, MFT, and Fuji camera systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 64.5mm Optical Path with Precision Back-Focus Adjustment\u003c\/h3\u003e\n\u003cp\u003eAchieving perfect sensor-to-flattener spacing is critical for optimal correction, and the Flattener 68III is built with this in mind. The unit is adjustable, allowing you to precisely dial in the required back focus for your specific camera and filter setup. This fine-tuning capability ensures you can achieve the sharpest possible stars across the entire field, regardless of minor variations in your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary function of the William Optics Flattener 68III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Flattener 68III is an optical corrector designed to eliminate field curvature in refractor telescopes. It ensures that stars are sharp and pinpoint not just in the center of the image, but all the way to the corners. As a \u003cstrong\u003e1.0x flattener\u003c\/strong\u003e, it accomplishes this without changing the telescope's native focal length or f-ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich telescopes is the Flattener 68III compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis flattener is specifically designed for a direct, threaded connection to the M92 focusers on the following William Optics models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFluorostar 132 (FLT132)\u003c\/li\u003e\n\u003cli\u003eGran Turismo 102 (GT102)\u003c\/li\u003e\n\u003cli\u003eGran Turismo 153 (GT153)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Flattener 68III perform with a full-frame camera like a Sony A7 on the GT102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent match. The Flattener 68III is designed to correct the entire field of a full-frame sensor. When paired with a GT102, you can expect sharp, round stars across the entire 24x36mm sensor of a Sony A7-series camera, with minimal vignetting thanks to the M48 camera connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I choose this 1.0x Flattener 68III instead of a reducer\/flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the 1.0x Flattener 68III when your primary goal is \u003cstrong\u003emaximum image resolution and scale\u003c\/strong\u003e. A reducer\/flattener makes your telescope \"faster\" and provides a wider field of view, but it shrinks the image. For detailed work on smaller galaxies or planetary nebulae where every bit of focal length matters, a 1.0x flattener is the superior choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"adjustable\" feature of the Flattener 68III do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adjustable design allows you to make micro-adjustments to the back focus distance—the spacing between the flattener's rear lens and your camera sensor. This is crucial for achieving perfect corner-to-corner star sharpness, as it lets you compensate for the exact thickness of your adapters, filter wheels, or off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Flattener 68III work for imaging the full Andromeda Galaxy (M31) with an FLT132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the Flattener 68III will provide a perfectly corrected field, an FLT132 at its native focal length may be too magnified to capture the entire Andromeda Galaxy (M31) in a single frame, even with a full-frame sensor. For a target of that size with that telescope, a reducer\/flattener would be a better choice to achieve a wider field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e1.0 x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e2 Elements in 2 Groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Sensor Formats\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM92 x 1 (Male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 (Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e64.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Brand Support\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF, Nikon F, Z, Sony E, Pentax K, MFT (M4\/3), FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e718.2 g \/ 1.58 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics Flattener 68III\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967220117789,"sku":"WO-P-FLAT68III","price":1087.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-Flattener-68III-P-FLAT68III-1__37693.1596133239.1280.1280.jpg?v=1684339133"},{"product_id":"william-optics-adjustable-flat6aiii","title":"William Optics Adjustable Flat6AIII","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.8x Focal Reducer \u0026amp; Field Flattener\u003c\/li\u003e\n\u003cli\u003eOptimized for GT71, GT81, Z81 \u0026amp; Z103 Refractors\u003c\/li\u003e\n\u003cli\u003eIlluminates Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003eAdjustable Back Focus Mechanism\u003c\/li\u003e\n\u003cli\u003eM63 Telescope-Side Thread\u003c\/li\u003e\n\u003cli\u003eM48 Camera-Side Thread with Filter Slot\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eWilliam Optics Adjustable Flat6AIII 0.8x Reducer \u0026amp; Flattener\u003c\/h2\u003e\n      \u003cp\u003eThe William Optics Adjustable Flat6AIII is a 0.8x reducer and flattener engineered specifically to convert William Optics GT71, GT81, Z81, and Z103 refractors into flat-field astrographs. Its 3-element apochromatic optical design uses Ohara glass to correct for field curvature across 97% of a full-frame sensor, connecting directly to the telescope via an M63 thread and to your camera with a standard M48 T-mount.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e0.8x Reduction and 97% Full-Frame Illumination\u003c\/h3\u003e\n      \u003cp\u003eBy reducing your telescope's focal ratio by a factor of 0.8x, the Flat6AIII significantly shortens required exposure times and expands your field of view. This transforms a GT81 from f\/5.9 to a faster f\/4.7 system, allowing you to capture faint nebulosity in less time and frame larger targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000). The optical design provides excellent illumination and pinpoint stars across 97% of a full-frame sensor's diagonal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAPO Triplet Optics: A 3-Element Ohara Glass Design\u003c\/h3\u003e\n      \u003cp\u003eThe Flat6AIII employs a 3-element apochromatic (APO) lens design constructed from premium Ohara glass. This triplet configuration, combined with full multi-coatings, ensures high-contrast images free of distracting chromatic aberration. Where simpler flatteners can introduce bloated or discolored stars at the edge of the field, the Flat6AIII maintains sharp, color-pure stars right to the corners of your frame, preserving the optical integrity of your William Optics refractor.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eM63 Direct-Thread Integration for 4 William Optics Refractors\u003c\/h3\u003e\n      \u003cp\u003eThis flattener attaches directly to the focuser drawtube using a robust M63 thread, creating a solid, flex-free imaging train. This direct connection is superior to standard 2\" nosepiece adapters, which can introduce tilt. The body of the Flat6AIII is adjustable to set the precise back focus for your specific telescope, and an integrated M48 filter slot behind the camera threads allows for the easy installation of 2\" filters without adding extra accessories.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich William Optics telescopes is the Flat6AIII compatible with?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe William Optics Flat6AIII is specifically designed and optimized for four refractors: the \u003cstrong\u003eGT71\u003c\/strong\u003e, \u003cstrong\u003eGT81\u003c\/strong\u003e, \u003cstrong\u003eZ81\u003c\/strong\u003e, and \u003cstrong\u003eZ103\u003c\/strong\u003e. It connects via a direct M63 thread on these models.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 0.8x reduction of the Flat6AIII benefit my imaging with a GT81?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 0.8x reduction makes your telescope \"faster,\" meaning it gathers light more quickly. On a GT81 (f\/5.9), the Flat6AIII creates an f\/4.7 imaging system. This reduces your required exposure time by about 36%, allowing you to collect more data in a single night. It also provides a wider field of view to better frame large deep-sky objects.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a full-frame DSLR like a Canon EOS Ra with the Flat6AIII?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The Flat6AIII is designed to fully illuminate and correct for full-frame sensors up to 44mm. You will need the appropriate M48 T-ring for your camera mount (e.g., Canon RF) to connect it to the flattener's M48 threads.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the Flat6AIII to my telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Flat6AIII threads directly onto the focuser. You will first need to unthread and remove the standard 2\" eyepiece holder from your telescope's focuser. The flattener's M63 threads then screw directly onto the focuser drawtube for a secure, tilt-free connection.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the William Optics Flat6AIII?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The Flat6AIII has an integrated M48 x 0.75 filter thread just inside the camera-side connection. This allows you to thread in any standard 2\" astronomy filter (which uses M48 threads) for light pollution reduction or narrowband imaging.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"adjustable back focus\" mean on the Flat6AIII?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe body of the William Optics Flat6AIII can be extended or retracted to fine-tune the distance between the flattener's optics and your camera sensor. Each compatible telescope model requires a slightly different spacing for a perfectly flat field. This adjustability ensures you can achieve optimal optical correction without needing to add or remove spacers.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFlattener Power\u003c\/td\u003e\n\u003ctd\u003e0.8 x\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003e3 Groups, 3 Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCamera Format Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eM63 x 1 x 6 mm Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 x 4 mm T-Mount Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatible T-Mounts\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF, Nikon F, Z, Sony E, Pentax K, MFT (M4\/3), FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e61.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e519.4 g \/ 1.15 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967221002525,"sku":"WO-P-FLAT6AIII","price":371.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLAT6AIII__75538.1675887359.1280.1280.jpg?v=1684339316"},{"product_id":"william-optics-adjustable-flat73a-for-z73","title":"William Optics Adjustable Flat73A for Z73","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned specifically for the William Optics ZenithStar 73 APO\u003c\/li\u003e\n\u003cli\u003eDelivers a 1.0x, perfectly flat field across full-frame sensors\u003c\/li\u003e\n\u003cli\u003eConnects to the Z73 focuser via a secure M63 thread\u003c\/li\u003e\n\u003cli\u003eProvides a standard M48 x 0.75 thread for camera T-rings and accessories\u003c\/li\u003e\n\u003cli\u003eAdjustable design ensures precise back focus for a wide range of cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Adjustable Flat73A for Z73\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Adjustable Flat73A is the essential imaging accessory for the ZenithStar 73 telescope, engineered to eliminate field curvature across sensors up to full-frame size. This 1.0x flattener preserves the Z73's native focal length and f-ratio, connecting securely via its M63 thread and providing a standard M48 output for your camera. The 2-element optical design ensures that stars remain pinpoint sharp from the center of your image to the extreme corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Correction at 1.0x Power\u003c\/h3\u003e\n\u003cp\u003eThe Flat73A uses a 2-element optical design in two groups to correct the field curvature inherent in the Z73's fast, wide-field optics. As a 1.0x flattener, it does not act as a reducer or extender, so your telescope's focal length and focal ratio remain unchanged. This design is optimized to illuminate and correct for sensors up to a full-frame format, making it ideal for DSLRs, mirrorless cameras, and large-chip dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZ73-Specific M63 Thread and M48 Camera Connection\u003c\/h3\u003e\n\u003cp\u003eDesigned for seamless integration, the Flat73A attaches directly to the ZenithStar 73's focuser drawtube using a robust M63 x 1 thread, ensuring a rigid, tilt-free connection. The camera side features the astrophotography standard M48 x 0.75 male thread, allowing you to connect a wide array of cameras from Canon, Nikon, Sony, Fuji, and more using a standard M48 T-ring. The adjustable nature of the flattener is critical for achieving the precise sensor-to-flattener distance required for a perfectly flat field with different camera models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"1.0x power\" mean for the William Optics Flat73A?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003e1.0x flattener\u003c\/strong\u003e corrects for field curvature without changing the focal length or f-ratio of your telescope. With the Flat73A, your ZenithStar 73 will operate at its native focal length, producing images with the same scale and field of view as it would without the flattener, but with the benefit of sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Flat73A flattener with a telescope other than the Z73?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the Flat73A is optically and mechanically designed specifically for the William Optics ZenithStar 73. It uses a proprietary \u003cstrong\u003eM63 x 1 thread\u003c\/strong\u003e to attach to the Z73's focuser and its optical prescription is matched to that telescope's specific objective lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the maximum sensor size the Flat73A can illuminate and correct?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics Flat73A is designed to provide a corrected, unvignetted image circle for camera sensors up to \u003cstrong\u003efull-frame\u003c\/strong\u003e size. It is also perfectly suitable for smaller APS-C and Micro Four Thirds sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my Nikon Z mirrorless camera to the Flat73A?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need an M48 T-ring specifically made for the Nikon Z-mount. The Flat73A provides the standard \u003cstrong\u003eM48 x 0.75 male thread\u003c\/strong\u003e that the T-ring will attach to. The adjustable mechanism on the flattener then allows you to set the correct distance to your camera's sensor for optimal correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Flat73A improve my images of the North American Nebula (NGC 7000) with a Z73?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZenithStar 73 provides a wide field of view perfect for large targets like the North American Nebula (NGC 7000). However, without correction, stars at the edges of such a large object will appear elongated or out of focus. The Flat73A corrects this distortion, ensuring that every star across the vast nebula complex is rendered as a sharp, round point, resulting in a much cleaner and more professional final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Flat73A necessary if I'm only using an APS-C camera with my Z73?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. While an APS-C sensor is smaller than full-frame, the field curvature of the Z73 is still significant enough to be visible on an APS-C chip. Using the Flat73A will provide a noticeably flatter field, which is critical for accurate guiding, clean image stacking, and producing high-quality images where the corner performance matches the center.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Power\u003c\/td\u003e\n\u003ctd\u003e1.0 x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e2 elements in 2 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Camera Formats\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eM63 x 1 x 6 mm thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 x 4 mm thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported T-Mounts\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF, Nikon F, Z, Sony E, Pentax K, MFT (M4\/3), FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Optical Length\u003c\/td\u003e\n\u003ctd\u003e65.5 mm (Flattener 39.5 mm + Rotator\/Adapter 26 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e328.8 g \/ 0.72 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics Adjustable Flat73A for Z73\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eNo downloads available for this product.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967221657885,"sku":"WO-P-FLAT73A","price":384.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WO-P-FLAT73A-1.jpg?v=1722098931"},{"product_id":"william-optics-adjustable-reducer-flattener-flat73r-for-z73","title":"William Optics Adjustable Reducer Flattener Flat73R for Z73","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal length by a factor of 0.8x\u003c\/li\u003e\n\u003cli\u003eDesigned for the William Optics Zenithstar 73 telescope\u003c\/li\u003e\n\u003cli\u003eProvides edge-to-edge flat field for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eConnects via a secure M63 x 1 thread\u003c\/li\u003e\n\u003cli\u003eFeatures a standard M48 x 0.75 camera thread\u003c\/li\u003e\n\u003cli\u003eIntegrated camera rotator for easy framing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Adjustable Reducer Flattener Flat73R for Z73\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Adjustable Reducer Flattener Flat73R is engineered specifically to transform the Zenithstar 73 APO refractor into a wide-field astrograph. Its 3-element, 3-group optical design delivers a 0.8x focal reduction, correcting for field curvature across full-frame sensors. The unit attaches via a robust M63 x 1 thread and presents a standard M48 x 0.75 T-mount to your camera, all while weighing just 573.9 g.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e0.8x Focal Reduction: A Wider, Faster Field for the Z73\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Flat73R is its 0.8x reduction factor, which shortens the Z73's focal length for a significantly wider true field of view. This allows you to capture large targets like the Andromeda Galaxy (M31) or the entire Veil Nebula complex in a single frame. This reduction also concentrates incoming light, drastically shortening required exposure times and increasing your signal-to-noise ratio on faint deep-sky objects.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Element, 3-Group Optics:\u003c\/strong\u003e This sophisticated design ensures high-contrast, sharp stars across the entire image circle, correcting for aberrations introduced by the reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-Frame Illumination:\u003c\/strong\u003e The optics are designed to fully illuminate and flatten the field for sensors up to full-frame (36x24mm) format, preventing vignetting and distorted stars in the corners of your images.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEngineered for the Z73: M63 Threads and an 89mm Optical Length\u003c\/h3\u003e\n\u003cp\u003eThe Flat73R provides a mechanically rigid connection to the Zenithstar 73. It threads directly onto the focuser's M63 x 1 thread, eliminating any potential for sag or flexure that can occur with compression fittings, especially with the added weight of a filter wheel and camera. The total optical length is 89 mm, composed of the 49 mm flattener body and a 40 mm rotator and adapter assembly that allows for precise framing of your target without loosening the camera.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure M63 Connection:\u003c\/strong\u003e Ensures perfect optical alignment and stability throughout an imaging session.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M48 x 0.75 Camera Thread:\u003c\/strong\u003e Provides a wide, non-vignetting connection compatible with modern DSLR\/mirrorless T-rings and dedicated astronomy cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Rotator:\u003c\/strong\u003e The 40 mm adapter section includes a camera rotator, an essential feature for composing your shot without having to unthread your imaging train.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZ73 Native vs. Reduced: What 0.8x Means for Your Images\u003c\/h3\u003e\n\u003cp\u003eWithout a corrector, the Z73 is a superb visual instrument, but for imaging, field curvature will soften stars at the edge of the frame. The Flat73R not only corrects this but fundamentally changes the telescope's imaging characteristics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Field of View:\u003c\/strong\u003e The 0.8x reduction allows you to fit larger celestial objects into your frame compared to imaging at the native focal length. This is critical for large nebulae and nearby galaxies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster Imaging:\u003c\/strong\u003e By reducing the focal ratio, the Flat73R gathers the same amount of light in a shorter time. An object that requires a 10-minute exposure at the native focal length can be captured with similar signal in just over 6 minutes, allowing you to gather more data in a single night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrade-off:\u003c\/strong\u003e The primary trade-off is a slight reduction in image scale. For smaller targets like most galaxies or planetary nebulae, imaging at the native focal length (with a flattener-only accessory) will yield a larger, more detailed image.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the William Optics Flat73R do for my Z73 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Flat73R is a dual-purpose optical accessory. It acts as a \u003cstrong\u003efield flattener\u003c\/strong\u003e to correct the natural curvature of the focal plane, ensuring sharp, point-like stars across your entire sensor, especially large full-frame chips. It also acts as a \u003cstrong\u003e0.8x focal reducer\u003c\/strong\u003e, which widens your field of view and makes the telescope \"faster,\" reducing your exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Flat73R compatible with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The William Optics Flat73R is designed to provide excellent correction and illumination for camera sensors up to and including the \u003cstrong\u003efull-frame (36x24mm)\u003c\/strong\u003e format. It provides a standard M48 x 0.75 thread for connection, which is ideal for minimizing vignetting with large sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach my camera to the Flat73R reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou attach your camera via the Flat73R's \u003cstrong\u003eM48 x 0.75 T-mount thread\u003c\/strong\u003e. You will need an M48 T-ring specific to your camera's mount (e.g., Canon EF, Nikon F, Sony E). This provides a secure, threaded connection for your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Flat73R's weight of 573.9 g affect my Z73's balance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, adding the \u003cstrong\u003e573.9 g (1.27 lbs)\u003c\/strong\u003e of the reducer, plus your camera and any other accessories, will require you to rebalance your telescope on the mount. The Z73's focuser is robust enough to handle the load, but proper balance in both RA and Dec is critical for accurate tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I frame the entire North American Nebula (NGC 7000) with the Z73 and Flat73R?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The wide field of view provided by the 0.8x reduction is ideal for very large targets like the North American Nebula (NGC 7000) and the nearby Pelican Nebula (IC 5070). With most APS-C and full-frame cameras, you should be able to capture the entire nebula complex in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I use the Z73 without the Flat73R reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the Flat73R is essential for wide-field imaging, you would remove it for visual observation with an eyepiece. For imaging smaller targets like the Whirlpool Galaxy (M51) or the Ring Nebula (M57), you might prefer to use a 1.0x flattener (sold separately) to maintain the telescope's native focal length for a larger image scale and more detail on the object.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReducer Power\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3 Elements in 3 Groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003eFlattener 49 mm + Rotator\/Adapter 40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eM63 x 1 (7 mm length)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 (4 mm length)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Coverage\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mount Support\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF, Nikon F, Z, Sony E, Pentax K, MFT (M4\/3), FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e573.9 g \/ 1.27 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967221788957,"sku":"WO-P-FLAT73R","price":409.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-Adjustable-Reducer-Flattener-Flat73R-for-Z73-P-FLAT73R-1__40133.1596133243.1280.1280.jpg?v=1684339331"},{"product_id":"william-optics-x0-8-reducer-flattener-7a","title":"William Optics x0.8 Reducer Flattener 7A","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio by a factor of 0.8x\u003c\/li\u003e\n\u003cli\u003eTriplet lens design with 3 elements in 3 groups\u003c\/li\u003e\n\u003cli\u003eCorrects field curvature for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eDesigned for specific William Optics GT102, FLT132, and GT153 refractors\u003c\/li\u003e\n\u003cli\u003eStandard M48 x 0.75 camera connection thread\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics x0.8 Reducer Flattener 7A\u003c\/h2\u003e\n\u003cp\u003eThe William Optics x0.8 Reducer Flattener 7A is an essential optical corrector engineered to convert select William Optics refractors into fast, wide-field astrographs. This unit reduces your telescope's focal length by a factor of 0.8x while its 3-element, 3-group triplet lens design delivers a perfectly flat field for full-frame camera sensors. It attaches via a robust M92 x 1 thread and requires 59.5 mm of back focus to achieve pinpoint stars across the entire image frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet APO Optics: 0.8x Reduction for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThis corrector uses a three-element apochromatic lens structure to achieve its optical goals without introducing chromatic aberration. The 0.8x reduction factor effectively shortens your telescope's focal length, which provides a wider true field of view and reduces exposure times by nearly 40%. The flattener component corrects for the field curvature inherent in refractor optics, ensuring that stars in the corners of your full-frame or APS-C sensor are as sharp as those in the center.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM92 Connection: Dedicated Fit for 3 William Optics Refractors\u003c\/h3\u003e\n\u003cp\u003eThe Flattener 7A is not a universal accessory; it is optically matched to specific William Optics telescopes to ensure optimal correction. It connects directly to the focuser drawtube using a secure M92 x 1 male thread. This corrector is designed exclusively for the Gran Turismo 102 (must have a 3\" focuser), the Fluorostar 132, and the Gran Turismo 153. This dedicated design guarantees that the flattener's corrective power is perfectly aligned with the optical characteristics of these premium refractors.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Interface:\u003c\/strong\u003e The camera side features a standard M48 x 0.75 thread, providing a wide, unvignetted connection for filter wheels, off-axis guiders, and full-frame camera T-rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack Focus:\u003c\/strong\u003e A precise back focus of 59.5 mm from the flattener's shoulder to the camera sensor is required. This distance must be maintained using extension tubes to achieve a flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e At 888.4 g (1.96 lbs), it is a substantial optical element that requires a robust focuser to maintain collimation and prevent sag.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the William Optics Flattener 7A work with my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis flattener is designed for a specific set of telescopes and will not work correctly with others. It is compatible \u003cstrong\u003eonly\u003c\/strong\u003e with the William Optics \u003cstrong\u003eGT102 (with 3\" focuser)\u003c\/strong\u003e, \u003cstrong\u003eFLT132\u003c\/strong\u003e, and \u003cstrong\u003eGT153\u003c\/strong\u003e. It connects via an M92 x 1 thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the required back focus for the Flattener 7A?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is \u003cstrong\u003e59.5 mm\u003c\/strong\u003e. This is the distance from the shoulder of the M48 thread on the flattener to your camera's sensor plane. You must use the correct combination of spacers to achieve this distance for sharp, round stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 0.8x reduction affect my FLT132's imaging speed?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe FLT132 has a native focal ratio of f\/6.9. With the 0.8x reducer, the effective focal ratio becomes approximately f\/5.5. This \"faster\" system gathers light more quickly, allowing you to capture the same amount of signal on a target like the Heart Nebula (IC 1805) in significantly shorter exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my full-frame camera with the William Optics Flattener 7A?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Flattener 7A is designed to fully illuminate and correct for full-frame sensors (24x36mm format). It also works perfectly with smaller APS-C and M4\/3 sensors. The camera connects via a standard M48 x 0.75 T-ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Flattener 7A suitable for imaging the Andromeda Galaxy (M31) with a GT153?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The GT153 is a long focal length instrument. The 0.8x reduction provided by the Flattener 7A creates a wider field of view, making it much easier to frame large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"3 Groups 3 Elements\" lens type mean for the Flattener 7A?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis refers to its optical design, which is a \u003cstrong\u003eTriplet\u003c\/strong\u003e. It uses three individual lens elements arranged in three groups. This sophisticated design allows it to reduce the focal length and flatten the field while maintaining excellent color correction (apochromatic performance), preventing bloated or blue-fringed stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Power\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003e3 Elements in 3 Groups (Triplet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Camera Formats\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eM92 x 1 x 6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 x 4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e59.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported T-Mounts\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF, Nikon F, Z, Sony E, Pentax K, MFT (M4\/3), FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e888.4 g \/ 1.96 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics x0.8 Reducer Flattener 7A\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967223623965,"sku":"WO-P-FLAT7A","price":1087.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-x0-8-Reducer-Flattener-7A-P-FLAT7A-1__75973.1596133243.1280.1280.jpg?v=1684339155"},{"product_id":"william-optics-wo-x0-72-reducer-flattener-8","title":"William Optics WO x0.72 Reducer Flattener 8","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio by a factor of 0.72x\u003c\/li\u003e\n\u003cli\u003eCorrects field curvature for full-frame sensors\u003c\/li\u003e\n\u003cli\u003e3-element, 3-group optical design\u003c\/li\u003e\n\u003cli\u003eConnects to telescope via M92 x 1 thread\u003c\/li\u003e\n\u003cli\u003eStandard M48 x 0.75 camera-side threading\u003c\/li\u003e\n\u003cli\u003eWeighs 1098 g (2.42 lbs)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics WO x0.72 Reducer Flattener 8\u003c\/h2\u003e\n\u003cp\u003eThe William Optics WO x0.72 Reducer Flattener 8 is engineered to transform high-focal-length William Optics refractors into faster, wide-field astrographs capable of illuminating full-frame sensors. Its 3-element, 3-group design provides a 0.72x focal reduction, significantly decreasing exposure times while correcting for field curvature from edge to edge. This unit connects to the telescope focuser via a robust M92 x 1 thread and provides a standard M48 x 0.75 thread for direct attachment to modern DSLR and dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Faster, Wider Field: 0.72x Reduction for Large Refractors\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the Flattener 8 is to reduce your telescope's effective focal length by a factor of 0.72x. For an f\/7 refractor, this transforms the optical system into a faster f\/5.04 instrument, cutting required exposure times by nearly 50%. This speed advantage allows you to capture more data on faint targets in a single night and increases the field of view to frame large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEdge-to-Edge Correction: Full-Frame Illumination with a 3-Element Design\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for large-aperture refractors, the Flattener 8 provides a corrected image circle that fully supports full-frame (36x24mm) camera sensors. The 3-element optical system in 3 groups is optimized to eliminate field curvature and minimize off-axis aberrations, ensuring that stars remain tight, pinpoint sources across the entire frame. This avoids the bloated, comatic stars in the corners that are common in uncorrected systems, delivering professional-grade astrophotography results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRobust Integration: M92 Telescope Thread and M48 Camera Support\u003c\/h3\u003e\n\u003cp\u003eThe Flattener 8 is built for a secure, flex-free imaging train. It attaches to compatible William Optics focusers using a large M92 x 1 male thread for a rigid connection. On the camera side, it terminates in a standard M48 x 0.75 male thread, the ideal interface for connecting filter wheels, off-axis guiders, and a wide range of camera-specific T-rings. At 1098 g (2.42 lbs), its solid construction ensures optical alignment is maintained, though it requires a robust focuser to handle the load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich William Optics telescopes are compatible with the Flattener 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Flattener 8 is designed for William Optics' larger refractors that feature a focuser with a female M92 x 1 thread. It is commonly paired with models like the Fluorostar 132 (FLT132) and Fluorostar 156 (FLT156). Always confirm your telescope's focuser thread before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the WO Flattener 8 provide a fully corrected field for a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is explicitly designed to provide excellent correction and illumination for \u003cstrong\u003efull-frame sensors (36x24mm)\u003c\/strong\u003e, as well as smaller APS-C and M4\/3 formats. You can expect sharp, pinpoint stars from the center to the corners of your full-frame camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 0.72x reduction of the Flattener 8 affect my imaging time?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFocal reduction makes your telescope \"faster\" by concentrating the same amount of light onto a smaller area. A 0.72x reducer shortens exposure times by a factor of (0.72)^2, or approximately 0.52. This means a 10-minute exposure without the reducer would require only about 5 minutes to achieve the same signal-to-noise ratio with the Flattener 8 installed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the required back focus for the William Optics Flattener 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the optical length is 77 mm, the required back focus (the distance from the flattener's rear flange to the camera sensor) is a critical, fixed distance that must be precisely met. This specification is typically 55mm for M48-threaded correctors but you must consult the documentation for your specific William Optics telescope and this flattener to confirm the exact spacing needed for optimal performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the connection threads on the WO Flattener 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Flattener 8 uses two primary threads:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope Side:\u003c\/strong\u003e M92 x 1 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Side:\u003c\/strong\u003e M48 x 0.75 male thread (also known as the 2\" filter thread standard).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 1098 g weight of the Flattener 8 a concern for my telescope's focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 2.42 lbs, the Flattener 8 is a substantial piece of optical equipment. It requires a high-quality, robust focuser capable of handling heavy imaging trains without slipping or flexing. The rack-and-pinion focusers found on the William Optics telescopes it's designed for are more than capable of supporting this weight along with a camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReducer Power\u003c\/td\u003e\n\u003ctd\u003e0.72x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3 Elements in 3 Groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Format Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eM92 x 1 x 7.5 mm Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 x 4 mm Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported T-Mounts\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4\/3); FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e77 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1098 g \/ 2.42 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics WO x0.72 Reducer Flattener 8\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967224148253,"sku":"WO-P-FLAT8","price":1161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-WO-x0-72-Reducer-Flattener-8-P-FLAT8-1__56697.1596133245.1280.1280.jpg?v=1684339346"},{"product_id":"starlight-instruments-housing-only-w-o-sips-optics","title":"Starlight Instruments Housing Only w\/o SIPS Optics","description":"\u003c!-- more --\u003e\u003cp\u003e\u003cspan\u003eThis is a complete housing without the SIPS optic.  The housing can be used for astronomers that have more than 1 telescope and want to use the SIPS on multiple scopes.  You can simply unscrew the optics from the SIPS unit on one scope and screw in the optics into this housing on another scope.  If you want to use the SIPS unit on more than 1 telescope, this will allow you to conveniently and efficiently utilize the SIPS unit on both scopes without having to purchase 2 complete SIPS units.  Once the optics are installed in the housing there is no need to \"\"re-tune\"\" the optics.\u003c\/span\u003e\u003c\/p\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKnown To Fit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSI-SIPS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUse with\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFTF2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Starlight Instruments","offers":[{"title":"Default Title","offer_id":44967287488797,"sku":"SI-SIPSHOUSING","price":420.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"starlight-instruments-sips-coma-corrector","title":"Starlight Instruments SIPS Coma Corrector","description":"\u003c!-- more --\u003e\u003cp\u003e Starlight Instruments is proud to introduce a new Coma Corrector called the Starlight Integrated Paracorr System (referred to as \u003cspan\u003eSIPS\u003c\/span\u003e hereafter). The SIPS is an integrated focuser-mounted version of the TeleVue Paracorr Type 2.\u003c\/p\u003e\u003cp\u003e This Coma Corrector functions with Starlight Instruments finely crafted Feather Touch focuser and combined with TeleVue’s 1st-class optics, which together, makes this the ultimate coma corrector.\u003c\/p\u003e\u003cp\u003e Below is a link for more facts and setup notes for the SIPS which were written by Mike Lockwood owner of Lockwood Optics\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSIPS Setup and Facts\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e The advantages of the \u003cstrong\u003eSIPS\u003c\/strong\u003e Coma Corrector is once it is set-up, there is no need to fumble with locking screws, turning your flashlight on to check its position, etc. This saves time and hassle. Also, the assembly is more rigid and flexure is greatly reduced. The SIPS Coma Corrector totally eliminates the need to re-adjust\/calibrate when switching eyepieces. You will simply adjust the focus knobs of your Feather Touch focuser for viewing. Because of this, the SIPS Coma Corrector will save you valuable observing time, less hassle and ease of use.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e Click here to view the instructions for this product\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e Collimating Notes\u003c\/p\u003e\u003cp\u003e Click the link to read the review from ATT\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e Mike Lockwood review\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e SIPS Dimensional Drawing\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUse with\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFTF2015BCR or FTF2015BCR-LW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther Info\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThe SIPS unit weighs .875 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Starlight Instruments","offers":[{"title":"Default Title","offer_id":44967287521565,"sku":"SI-SIPS","price":1190.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Starlight-Instruments-Starlight-Integrated-Paracorr-SystemSIPS-Coma-Corrector-SI-SIPS-1__24307.1596314018.1280.1280.jpg?v=1684339992"},{"product_id":"baader-alan-gee-telecompressor-mark-ii","title":"Baader Alan Gee Telecompressor Mark II","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDramatically widens the field of view of Schmidt-Cassegrain telescopes\u003c\/li\u003e\n\u003cli\u003eEngineered to produce a sharp, flat field for visual observation\u003c\/li\u003e\n\u003cli\u003eCreates a significantly faster focal ratio for brighter images\u003c\/li\u003e\n\u003cli\u003eSpecifically designed for close-coupling with select binoviewers\u003c\/li\u003e\n\u003cli\u003eRequires precise spacing for optimal optical correction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader Alan Gee Telecompressor Mark II\u003c\/h2\u003e\n\u003cp\u003eThe Baader Alan Gee Telecompressor Mark II is a specialized optical corrector designed to solve the primary limitation of Schmidt-Cassegrain telescopes: their narrow, long-focus field of view. This telecompressor significantly reduces the effective focal length of your SCT, delivering a wider, flatter, and brighter image. It is engineered specifically for visual observers using binoviewers, transforming the observing experience on large deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWiden Your SCT's Field for Rich-Field Views\u003c\/h3\u003e\n\u003cp\u003eStandard SCTs excel at high-power planetary views but struggle to frame large objects like the Andromeda Galaxy (M31) or the Pleiades (M45). The Alan Gee Telecompressor Mark II corrects this by shortening the telescope's light cone, expanding your true field of view to encompass these expansive targets. The result is a sharp, flat field that turns your SCT into a capable rich-field instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptimized for Baader, Zeiss, and Celestron Binoviewers\u003c\/h3\u003e\n\u003cp\u003eUnlike generic focal reducers, the Alan Gee Mark II is a purpose-built solution for binoviewing. Its design requires critical \"close coupling\" — a very specific and short distance between the compressor and the binoviewer prisms. This precise spacing is essential to achieve a fully illuminated and corrected field, limiting its use to specific Baader, Zeiss, and Celestron binoviewer models that can physically achieve this connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAlan Gee Mark II vs. Standard f\/6.3 Reducers\u003c\/h3\u003e\n\u003cp\u003eWhile a standard f\/6.3 reducer\/corrector offers a moderate increase in field of view, the Alan Gee Telecompressor is a more aggressive and specialized design. It provides a greater degree of focal reduction, but this comes with a critical trade-off.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard f\/6.3 Reducer:\u003c\/strong\u003e Offers more forgiving back-focus, making it compatible with a wide range of cameras and accessories. It's a general-purpose solution for both imaging and visual use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Alan Gee Mark II:\u003c\/strong\u003e Provides a wider, flatter field specifically for visual use with binoviewers. Its strict spacing requirements make it unsuitable for general imaging, but for its intended purpose, it delivers superior edge-of-field correction and a more immersive wide-field experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy won't the Baader Alan Gee Mark II work with my Denkmeier or Tele Vue binoviewer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Alan Gee Mark II's optical design requires extremely close spacing to the binoviewer's prisms to function correctly. Most binoviewers have a long optical path (e.g., through a power-switch diagonal) that makes this physically impossible. It is specifically designed for direct, close-coupled attachment to certain Baader, Zeiss, and Celestron models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Alan Gee Mark II for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis telecompressor is not recommended for general astrophotography. It is optimized for visual use and creating a flat field for the human eye within a binoviewer. Achieving the correct spacing with a camera sensor, filter wheel, and off-axis guider is typically not feasible and will result in poor optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Alan Gee Mark II affect the image brightness in my Celestron 11\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy reducing the telescope's effective focal ratio, the telecompressor concentrates the same amount of light into a smaller area. This creates a brighter image surface, which is especially beneficial for observing faint, extended objects like the Veil Nebula (NGC 6960). The background sky will appear brighter, but the nebula's contrast against it will increase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the \"close coupling\" mentioned for the Alan Gee Mark II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Close coupling\" refers to the minimal physical distance required between the last lens of the telecompressor and the focal plane (or in this case, the prisms of the binoviewer). The optical corrections of the Alan Gee design are only valid at this specific, short distance. Increasing this distance will introduce significant aberrations like coma and field curvature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to modify my SCT to use the Baader Alan Gee Mark II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo permanent modification is needed, but you will need the correct adapters to thread the telecompressor directly to your binoviewer and then attach the entire assembly to your telescope's visual back. It replaces the standard diagonal in your optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this telecompressor help me fit the entire Orion Nebula (M42) in the view of my 8\" SCT with a binoviewer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is precisely the kind of application the Alan Gee Mark II is designed for. A standard 8\" SCT with a binoviewer often cannot frame the full extent of M42's nebulosity. This telecompressor widens the field sufficiently to capture the entire object, from the Trapezium core to the fainter outer loops, in a single immersive view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.09\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eMulti-Coated (MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eField Flattener, Telecompressor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible telescopes\u003c\/td\u003e\n\u003ctd\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Alan_Gee_II_Telecompressor_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Alan Gee II Telecompressor Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967374094621,"sku":"BAA-2454400","price":401.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Alan-Gee-Telecompressor-Mark-II-1__02804.1597111079.1280.1280.jpg?v=1684341616"},{"product_id":"baader-fluorite-flatfield-converter","title":"Baader Fluorite Flatfield Converter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eGenuine Calcium Fluorite (CaF2) Two-Element Cemented Design\u003c\/li\u003e\n\u003cli\u003eCorrects for Field Curvature to Produce a Flat Imaging Plane\u003c\/li\u003e\n\u003cli\u003eVariable Magnification Factor Achieved by Adjusting Spacing\u003c\/li\u003e\n\u003cli\u003eStandard T-2 Thread and 2\" Barrel for Universal Connection\u003c\/li\u003e\n\u003cli\u003eEngineered for Large Image Circles Suitable for Medium-Format Sensors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader Fluorite Flatfield Converter\u003c\/h2\u003e\n\u003cp\u003eThe Baader Fluorite Flatfield Converter (FFC) is an optical amplifier engineered not merely to magnify, but to deliver an uncompromisingly sharp, flat field across a massive image circle. Conceived as the ultimate barlow-type lens, its two-element cemented design utilizes genuine Calcium Fluorite (CaF2) to achieve a level of resolution and field correction that remains unsurpassed, making it a critical component for high-resolution planetary imaging with modern, small-pixel cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA True Fluorite Flatfield Converter: Beyond the Barlow\u003c\/h3\u003e\n\u003cp\u003eUnlike a conventional barlow lens which primarily increases magnification, the FFC was designed from the ground up to also eliminate field curvature. This makes it a true \"converter,\" reshaping the optical output of your telescope to produce a perfectly flat focal plane. This is achieved through a sophisticated optical design that required extreme glass types, culminating in the use of genuine CaF2.\u003c\/p\u003e\n\u003cp\u003eThe use of Fluorite provides an unparalleled level of sharpness across a very broad spectral range, delivering apochromatic amplification. The result is an optical system with a line resolution far exceeding even legendary eyepiece designs, ensuring the only limit to image sharpness is the main optic of your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUncompromised Sharpness Across a Large, Flat Field\u003c\/h3\u003e\n\u003cp\u003eOriginally designed for the Zeiss APQ apochromats and medium-format film cameras, the FFC produces a fully illuminated and corrected image circle large enough for today's largest CMOS sensors. Even on fast telescopes, the FFC delivers significantly better on-axis sharpness than a classic barlow, which is the deciding factor in planetary and lunar photography.\u003c\/p\u003e\n\u003cp\u003eFor the dedicated planetary imager, this means you can exploit the full resolving power of your telescope. The enhanced contrast and resolution allow you to capture finer details in Jupiter's cloud bands or subtle features within the Cassini Division of Saturn's rings, pushing the performance of even relatively small, high-quality telescopes to their absolute limit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVariable Magnification and Universal T-2 Integration\u003c\/h3\u003e\n\u003cp\u003eThe FFC offers exceptional flexibility by allowing you to vary the magnification factor simply by changing the distance between the converter and the camera sensor. This allows you to precisely tailor the image scale to match seeing conditions and the target object, from moderate amplification for full-disc lunar shots to extreme magnification for detailed planetary work. The optimal line resolution is achieved at its native design distance, but on-axis sharpness remains diffraction-limited by your telescope even at very high magnifications.\u003c\/p\u003e\n\u003cp\u003eIntegration into any imaging train is straightforward. The Baader FFC features a standard T-2 (M42x0.75) thread on the camera side and its main body fits into any 2\" focuser or eyepiece clamp. This ensures compatibility with a vast ecosystem of adapters, extension tubes, and off-axis guiders via the Baader Astro T-2 and M68 systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCritical Thermal Management for CaF2 Optics\u003c\/h3\u003e\n\u003cp\u003eThe extraordinary optical properties of Calcium Fluorite come with a significant trade-off: extreme sensitivity to thermal shock. Sudden temperature changes can induce stress in the crystal, potentially causing permanent damage. To preserve this high-end optical system, meticulous care is mandatory.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcclimatization is Essential:\u003c\/strong\u003e Never move the FFC from a warm indoor environment directly into cold night air, or vice-versa. Allow it to cool down and warm up gradually inside an insulated case for at least an hour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar Observing is Forbidden:\u003c\/strong\u003e Do not use the FFC for solar photography. The focused heat can cause rapid, localized temperature changes that will destroy the fluorite elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Exclusion:\u003c\/strong\u003e Damage caused by thermal stress is detectable and is explicitly excluded from the warranty. This is not a grab-and-go accessory; it is a precision instrument that demands deliberate, careful handling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFFC vs. Other Baader Barlows: Choosing the Right Amplifier\u003c\/h3\u003e\n\u003cp\u003eBaader offers several barlows, each optimized for a different application. The FFC stands at the pinnacle for uncompromising, large-field imaging, but other options may be more suitable for different goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Zeiss Abbe Barlow:\u003c\/strong\u003e The Zeiss Abbe is the premier choice for the common visual magnification range. It offers legendary quality for visual observers who want a compact, high-contrast amplifier without the FFC's large-field correction or thermal sensitivity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. VIP Barlow:\u003c\/strong\u003e The VIP (Visual and Photographic) is a versatile workhorse calculated for full-frame (35mm) sensors. It's the ideal solution when you need excellent correction for standard camera formats without the cost and handling requirements of the FFC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Q-Turret Barlow:\u003c\/strong\u003e This inexpensive and high-quality barlow is designed for flexibility at lower magnifications. Its removable lens element can be threaded directly into eyepieces or camera noses, making it perfect for fine-tuning image scale on planetary cameras with long-focus telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Baader Fluorite Flatfield Converter different from a standard Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard Barlow lens is designed only to increase magnification, which often worsens existing field curvature. The \u003cstrong\u003eBaader FFC\u003c\/strong\u003e is a \"converter\" that both magnifies and corrects for field curvature, producing a sharp, flat imaging plane across a very large image circle, a feat made possible by its genuine Calcium Fluorite (CaF2) elements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I change the magnification with the Baader FFC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can vary the magnification of the \u003cstrong\u003eBaader FFC\u003c\/strong\u003e by adjusting the physical distance between the converter and your camera's sensor. Increasing the distance increases the magnification. This is typically done by adding T-2 extension tubes of various lengths into the imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there such strict temperature warnings for the Baader Fluorite Flatfield Converter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eBaader FFC\u003c\/strong\u003e uses lenses made from crystalline Calcium Fluorite (CaF2). While this material provides supreme optical correction, it is highly sensitive to thermal shock. A rapid change in temperature (e.g., moving it from a warm house to a cold outdoors) can cause internal stress that may permanently damage the lenses. Gradual acclimatization is mandatory for this instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader FFC for visual observing as well as imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003eBaader Fluorite Flatfield Converter\u003c\/strong\u003e can be used visually with an appropriate eyepiece holder attached to its T-2 thread. Its optical excellence provides stunning visual views, although its design is primarily optimized for photographic applications where its large, flat field can be fully utilized by a camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI image Jupiter with a large SCT. How will the Baader FFC improve my results over a typical Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor imaging Jupiter with an SCT, the \u003cstrong\u003eBaader FFC\u003c\/strong\u003e offers a significant advantage in on-axis sharpness and contrast compared to typical Barlows. Its superior optical correction ensures that you are capturing the finest possible detail that your telescope can resolve, limited only by the seeing conditions, not the amplifier in your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy full-frame camera shows field curvature with my refractor. Will the Baader Fluorite Flatfield Converter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The primary design goal of the \u003cstrong\u003eBaader Fluorite Flatfield Converter\u003c\/strong\u003e is to produce a flat imaging plane. If your refractor and camera combination suffers from field curvature, the FFC will actively correct for it while simultaneously increasing magnification, resulting in sharp stars from the center to the edge of your full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification (x)\u003c\/td\u003e\n\u003ctd\u003e3x - 8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eHigh transmission multi-coated (HT-MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eBarlow, Field Flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeciality\u003c\/td\u003e\n\u003ctd\u003eBarlow lens, Field Flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_FFC_System_Overview_with_Item_Numbers.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium FFC System Overview with Item Numbers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_FFC_Product_Flyer.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium FFC Product Flyer\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_FFC_Standard_Combinations_for_4x_Extension.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium FFC Standard Combinations for 4x Extension\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_FFC_Focal_Distances_Drawing.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium FFC Focal Distances Drawing\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967374127389,"sku":"BAA-2458200","price":1063.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Fluorite-Flatfield-Conve-1__47463.1597111082.1280.1280.jpg?v=1684341618"},{"product_id":"baader-m68-field-flattener","title":"Baader M68 Field Flattener","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects field curvature for astrophotography\u003c\/li\u003e\n\u003cli\u003eDesigned for Baader APO 95\/560 Travel Companion\u003c\/li\u003e\n\u003cli\u003eCompatible with Zeiss APQ apochromatic refractors\u003c\/li\u003e\n\u003cli\u003eFeatures large M68 threads for a secure, wide-aperture connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eBaader M68 Field Flattener\u003c\/h2\u003e\n      \u003cp\u003eThe Baader M68 Field Flattener is a dedicated optical corrector engineered to eliminate field curvature in specific high-end refractors. It is precisely matched to the optical system of the Baader APO 95\/560 Travel Companion and legendary Zeiss APQ apochromats. By using a robust M68 thread, this flattener ensures a rigid, wide-aperture imaging train capable of illuminating large format sensors without vignetting.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eM68 Connection for Flat-Field Imaging\u003c\/h3\u003e\n      \u003cp\u003eThis corrector utilizes the Baader M68 system, a large-diameter thread standard chosen to provide a rigid connection and an unobstructed light path for modern imaging sensors. Unlike smaller M42 or M48 threads that can introduce vignetting with full-frame and larger chips, the M68 connection maintains the full illumination of the optical system. This ensures that stars remain pinpoint across the entire frame, from the center to the corners, without compromising brightness at the edges.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDesigned for the Baader APO 95\/560 and Zeiss APQ Refractors\u003c\/h3\u003e\n      \u003cp\u003eThis is not a generic flattener; it is a specialized corrector calculated specifically for the Baader APO 95\/560 Travel Companion and classic Zeiss APQ refractors. Field flatteners must be matched to the focal length and optical design of a telescope to work correctly. This unit provides the precise correction required by these premium apochromatic systems, ensuring that their exceptional native image sharpness is delivered across the entire photographic field.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the Baader M68 Field Flattener?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader M68 Field Flattener is an optical accessory designed for astrophotography. It corrects for field curvature, a natural aberration in refracting telescopes that causes stars at the edge of the field of view to appear out of focus. By inserting this flattener into the optical path, you can achieve sharp, pinpoint stars across your entire camera sensor.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader M68 Field Flattener with any telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This field flattener is specifically designed and optically matched for use with the \u003cstrong\u003eBaader APO 95\/560 Travel Companion\u003c\/strong\u003e and \u003cstrong\u003eZeiss APQ\u003c\/strong\u003e apochromatic refractors. Using it with other telescopes will not provide the correct optical correction and will likely result in poor image quality.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Baader M68 Field Flattener use M68 threads?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe M68 thread provides a larger clear aperture than more common M48 or M42 threads. This is critical for preventing vignetting (dimming at the corners of the image) when using cameras with large, full-frame sensors. The larger thread also creates a more rigid and stable connection for heavy imaging trains.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader M68 Field Flattener suitable for visual observing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile you could technically place an eyepiece behind it, this accessory is designed purely for photographic use. Field flatteners are not necessary for visual observation, as the human eye is much more tolerant of field curvature than a camera sensor. Its primary function is to create a flat focal plane for imaging.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader M68 Field Flattener perform with a full-frame camera on the Baader APO 95\/560?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader M68 Field Flattener is engineered to provide excellent correction across large sensor formats when paired with the Baader APO 95\/560. The M68 connection is specifically intended to support full-frame sensors, ensuring the telescope's high-contrast, apochromatic performance is maintained to the corners of the frame for objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000).\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters are needed to connect my camera to the Baader M68 Field Flattener?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe required adapters depend on your specific camera and the necessary back focus distance. Baader Planetarium offers a comprehensive system of M68 adapters and extension tubes to achieve the correct spacing for various DSLR, mirrorless, and dedicated astronomy cameras. You will need to consult the flattener's documentation for the precise back focus requirement and select the appropriate adapters from the M68 lineup.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.39\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967374160157,"sku":"BAA-2458260","price":1056.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-M68-Field-Flattener-1__24858.1597111083.1280.1280.jpg?v=1684341642"},{"product_id":"baader-mpcc-mark-iii-multi-purpose-coma-corrector-2","title":"Baader MPCC Mark III (Multi Purpose Coma Corrector) - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects Coma in Newtonians as Fast as f\/3.5\u003c\/li\u003e\n\u003cli\u003eZero Change in Focal Length or Field Size\u003c\/li\u003e\n\u003cli\u003eFits Standard 2\" Focusers\u003c\/li\u003e\n\u003cli\u003eFeatures Baader Planetarium Phantom Group™ Multicoatings\u003c\/li\u003e\n\u003cli\u003eIntegrated M48 Male Thread for Filter and Accessory Connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader MPCC Mark III (Multi Purpose Coma Corrector) - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader MPCC Mark III (Multi Purpose Coma Corrector) corrects coma in Newtonian telescopes as fast as f\/3.5, delivering pinpoint stars across the entire photographic field. Unlike other correctors, the MPCC III mounts in any 2\" focuser and introduces zero change to your telescope's focal length, ensuring an f\/4 system remains a true f\/4 imaging platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePinpoint Stars Down to f\/3.5 without Changing Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the MPCC Mark III is to eliminate the distracting, comet-shaped stars at the edge of the field inherent in fast parabolic mirrors. This modern optical design is optimized for today's fast astrographs, providing exceptional correction down to f\/3.5. Crucially, the corrector achieves this without any magnification factor, preserving your telescope's native focal ratio and field of view for wide, fast imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePhantom Group Coatings: Full Spectrum Transmission from UV to NIR\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface of the MPCC Mark III features Baader's proprietary Phantom Group™ wideband multicoating. This treatment ensures the highest possible light transmission while minimizing reflections and scatter. The result is a brighter, higher-contrast image, with a spectral response that extends from the ultraviolet to the near-infrared, making it ideal for the full range of modern color and monochrome imaging sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Modular System for Any 2\" Focuser\u003c\/h3\u003e\n\u003cp\u003eDesigned as the market's most versatile coma corrector, the MPCC Mark III integrates seamlessly into virtually any imaging train. It slides into any 2\" focuser and features an M48 male thread on the camera side, allowing direct connection to filter wheels, off-axis guiders, and camera adapters. This modularity allows you to configure the corrector for both photographic and visual use, adapting to your specific equipment needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMPCC Mark III vs. Original MPCC: From f\/4.5 to f\/3.5\u003c\/h3\u003e\n\u003cp\u003eWhile the original Baader MPCC was designed for Newtonians from f\/4.5 to f\/6, the Mark III represents a significant optical upgrade. The improved lens design provides sharp, pinpoint stars on systems as fast as f\/3.5. This key enhancement makes the MPCC Mark III the ideal choice for imagers using modern, fast Newtonian astrographs who demand sharp stars edge-to-edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader MPCC Mark III change my telescope's focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The MPCC Mark III is a \"zero-power\" corrector, meaning it does not alter the native focal length or focal ratio of your telescope. An f\/4 Newtonian will remain an f\/4 Newtonian, preserving its original field of view and image scale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the fastest telescope I can use with the MPCC Mark III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe MPCC Mark III is designed to provide excellent coma correction on Newtonian telescopes as fast as \u003cstrong\u003ef\/3.5\u003c\/strong\u003e. It also works exceptionally well on slower systems up to f\/6.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect the MPCC Mark III to my DSLR for imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a standard M48 T-ring for your camera brand (e.g., Canon or Nikon). The T-ring threads directly onto the MPCC Mark III's M48 threads. Depending on your camera's sensor depth, you may need an additional T-2 spacer, such as the optional Baader T-Spacer (# 245 8405), to achieve the optimal 55mm back focus for sharp stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader MPCC Mark III for visual observing with my 10\" f\/4.7 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The MPCC Mark III is available in a visual configuration that includes adapters to connect a standard 1.25\" or 2\" eyepiece. It will provide wide, sharp fields of view, making it excellent for observing large star clusters like the Hercules Cluster (M13) without distracting coma at the edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Phantom Group coatings on the MPCC Mark III special?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBaader's Phantom Group™ coatings are a proprietary 7-layer multicoating that provides extremely high light transmission across a very wide spectral range from UV to NIR. This minimizes light loss and reflections, resulting in higher contrast and brighter images compared to standard coatings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need special adapters to use the MPCC Mark III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe base MPCC Mark III unit fits any standard 2\" focuser. For photographic use, you will need an M48 T-ring for your specific camera. For visual use, you will need an eyepiece holder that threads onto the M48 port. The corrector is sold in different configurations to provide the necessary adapters for your intended application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eBaader MPCC Mark III (Multi Purpose Coma Corrector)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector Type\u003c\/td\u003e\n\u003ctd\u003eNewtonian Coma Corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimized Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/3.5 to f\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length Modification\u003c\/td\u003e\n\u003ctd\u003eNone (1.0x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003ePhantom Group™ Multicoatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 Male Thread (2\" Filter Thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Configurations\u003c\/td\u003e\n\u003ctd\u003ePhotographic, Visual, and Visual\/Photographic Sets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.08 (Photographic)\u003cbr\u003e0.21 (Visual and Photographic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission\u003c\/td\u003e\n\u003ctd\u003e98%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2), M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Scale\u003c\/td\u003e\n\u003ctd\u003e1:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eScrew clamps (Visual and Photographic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm) (Visual and Photographic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader MPCC Mark III Coma Corrector Body\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003cp\u003e\u003csmall\u003eNote: Package contents may vary depending on the specific visual or photographic configuration selected.\u003c\/small\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_MPCC_Mark_III_Coma_Corrector_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium MPCC Mark III Coma Corrector Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_MPCC_Backfocus_from_T-2_and_M48_Surfaces_Drawing.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium MPCC Backfocus from T-2 and M48 Surfaces Drawing\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_MPCC_Mark_III_Coma_Corrector_Product_Information.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium MPCC Mark III Coma Corrector Product Information\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Photographic","offer_id":44967374258461,"sku":"BAA-2458400A","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"Visual and Photographic","offer_id":44967374291229,"sku":"BAA-2458403","price":328.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/mpcc-version_750x750__20426.1625854161.1280.1280.jpg?v=1684341656"},{"product_id":"baader-rcc-i-rowe-coma-corrector","title":"Baader RCC I Rowe Coma Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTriplet optical design corrects coma in fast Newtonian telescopes\u003c\/li\u003e\n\u003cli\u003eEngineered for a long back focus to accommodate complex imaging trains\u003c\/li\u003e\n\u003cli\u003eIdeal for use with Off-Axis Guiders, Adaptive Optics, and filter wheels\u003c\/li\u003e\n\u003cli\u003eFeatures Baader Planetarium's Phantom Group multi-coatings for maximum transmission\u003c\/li\u003e\n\u003cli\u003eConnects to accessories via a standard T-2 thread\u003c\/li\u003e\n\u003cli\u003eRemovable stop ring allows the corrector to sit deeper inside the focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader RCC I Rowe Coma Corrector\u003c\/h2\u003e\n\u003cp\u003eThe Baader RCC I Rowe Coma Corrector employs a new triplet lens design to deliver sharp, coma-free stars across the field in fast Newtonian imaging systems, connecting to your camera and accessories via a universal T-2 thread. This corrector is engineered specifically for imagers who require significant back focus to accommodate accessories like off-axis guiders, adaptive optics, or filter wheels without compromising optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet Optical Design for Fast Newtonian Coma Correction\u003c\/h3\u003e\n\u003cp\u003eUnlike simpler coma corrector designs, the RCC I uses a triplet lens system designed by Dave Rowe to neutralize the coma inherent in parabolic mirrors. Each air-to-glass surface receives Baader's Phantom Group multi-coatings, ensuring that light transmission is maximized for brighter images and higher contrast, which is critical when imaging faint deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLong Back Focus: Integrating Guiders, Filter Wheels, and AO\u003c\/h3\u003e\n\u003cp\u003eThe primary advantage of the RCC I is its generous back focus distance, measured from its T-2 thread. This provides ample space to install a complete imaging train, including an off-axis guider for precise tracking, an adaptive optics unit for atmospheric correction, and a filter wheel for multi-band imaging, all behind the corrector.\u003c\/p\u003e\n\u003cp\u003eFor additional mechanical flexibility, the corrector's threaded stop ring can be removed. This allows the body of the RCC I to be inserted deeper into the focuser, helping you reach focus with a wide variety of telescope and accessory combinations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader RCC I vs. MPCC Mark III: Choosing Your Coma Corrector\u003c\/h3\u003e\n\u003cp\u003eBaader offers two excellent coma correctors, and the choice depends entirely on your imaging train's back focus requirements.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader MPCC Mark III:\u003c\/strong\u003e This corrector is designed for the standard 55mm back focus common with DSLRs and many dedicated astronomy cameras. It is the ideal choice for simpler setups where an OAG or filter wheel is not needed, offering excellent correction in a compact form factor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader RCC I:\u003c\/strong\u003e The RCC I is the solution for complex setups. Its long back focus is specifically intended to accommodate the added path length of off-axis guiders, filter wheels, and adaptive optics. If your imaging train exceeds 55mm, the RCC I is the necessary choice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Baader RCC I different from other coma correctors?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key differentiator of the \u003cstrong\u003eBaader RCC I Rowe Coma Corrector\u003c\/strong\u003e is its significantly long back focus. This is a deliberate design choice that allows astrophotographers to place accessories like an \u003cstrong\u003eOff-Axis Guider (OAG)\u003c\/strong\u003e, \u003cstrong\u003eAdaptive Optics (AO)\u003c\/strong\u003e unit, or a \u003cstrong\u003efilter wheel\u003c\/strong\u003e between the corrector and the camera sensor, which is not possible with standard coma correctors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the correct spacing for my DSLR with the Baader RCC I?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the RCC I provides a long back focus, you will need to add extension tubes to reach the correct spacing for your camera. Baader recommends their \u003cstrong\u003eVariLock 46 T-2 Extension Tube (#2956946)\u003c\/strong\u003e, which is continuously variable and includes a helpful pre-engraved mark to quickly set the perfect distance for a standard DSLR with a T-2 ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader RCC I work with my 8\" f\/4 Newtonian for imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the RCC I is an excellent match for an 8\" f\/4 Newtonian. Its triplet design is made for fast optical systems and will produce sharp, point-like stars across the entire field of view, which is essential for capturing the full expanse of large targets like the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader RCC I for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader RCC I is specifically designed and optimized for astrophotography. While you could theoretically use it for visual observation, its optical prescription is not intended for eyepieces and may not produce optimal visual results. For visual coma correction, Baader's MPCC is a more suitable choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a ZWO OAG and filter wheel; is the RCC I a better choice than the MPCC for my Celestron 8\" f\/5 Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. For your f\/5 Newtonian, the combination of a ZWO OAG and filter wheel will require much more than the standard 55mm of back focus. The \u003cstrong\u003eBaader RCC I\u003c\/strong\u003e is the correct choice here, as its long back focus is specifically designed to accommodate exactly this kind of accessory stack, whereas the MPCC would not provide enough spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the Phantom Group Coatings on the RCC I do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003ePhantom Group Coatings\u003c\/strong\u003e are Baader Planetarium's proprietary 7-layer broadband anti-reflection coatings. They are applied to every air-to-glass surface on the RCC I's triplet lenses to maximize light transmission and minimize reflections, resulting in higher image contrast and brightness, especially on faint nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRowe Coma Corrector (Triplet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eComa correction for fast Newtonian telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003ePhantom Group Multi-Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eT-2 (M42x0.75) Male Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size (in)\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimized for focal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2), M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking Range\u003c\/td\u003e\n\u003ctd\u003ef\/3.5 – f\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Scale\u003c\/td\u003e\n\u003ctd\u003e1:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967374487837,"sku":"BAA-2956800","price":277.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-RCC-I-Rowe-Coma-Corrector-1__47999.1597111088.1280.1280.jpg?v=1684341672"},{"product_id":"lunt-8x-reducer-field-flattener","title":"Lunt .8X Reducer\/Field Flattener","description":"\u003c!-- more --\u003e\u003cp\u003eThe CAA 0.8x Reducer\/Field Flattener is an optimal accessory for those who are interested in astrophotography- Perfect to use with any camera of your choice!\u003c\/p\u003e\u003cp\u003eThe Reducer\/Field Flattener offers a wider field of view through your system, working to decrease the focal length of your system. Containing Multi-Coated optics and housed by a sturdy but light weight aluminum body, this accessory is a must for all photographic observers.\u003c\/p\u003e\u003cp\u003eProviding multiple thread types to be used on a variety of focuser types, the CAA Reducer\/Field Flattener is compatible with T-Thread adapters of your choice.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e.8x Reducer\/Field Flattener\u003c\/li\u003e\n\u003cli\u003e2″ Nose Tube\u003c\/li\u003e\n\u003cli\u003eConnections: \u003cul\u003e\n\u003cli\u003e63x1mm Threads\u003c\/li\u003e\n\u003cli\u003e68x1mm Threads\u003c\/li\u003e\n\u003cli\u003e54x.75mm Threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eMale T-Thread at Exit \u003cul\u003e\u003cli\u003e39x.75 internal thread at Exit\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatible for F7 Telescopes Between 80-130mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967532560669,"sku":"LSS-CAA-RF","price":629.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-0-8x-Reducer-Flattener-1__51988.1598296520.1280.1280.jpg?v=1684343573"},{"product_id":"apm-riccardi-reducer-m63","title":"APM Riccardi Reducer M63","description":"\u003c!-- more --\u003e\u003cp\u003e\u003ci\u003eOur new reducer, calculated and designed from Riccardi\u003c\/i\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eMassimo Riccardi, famous optical designer from Italy, designed for APM-Telescopes a new 3 element 0.75 x Apo-Reducer\/Flattener Corrector for all TMB-APM-LZOS Apochromatic Telescopes. Tests show that it also works on Apos from other manufacturers as well. The reducer shortens the focal length by a quarter and corrects the image circle - thereby converting your telescope into a fast astrograph!\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAssembly\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eThe connection to your telescope and camera occurs over an M63 x 1 thread. For the correct adjustment of the reducer\/flatener we can offer you an adjustment flange. \u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eBackfocus\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003e\u003cspan\u003eUsually  the reducer is screwed onto the focuser. The reducer can also be installed inside the focuser barrel, if the free aperture is equal to or larger than 68 mm.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe right backfocus for your telescope you will find in the enclosed PDF chart (see below). The total optical path of reducer plus backfocus plus focus change is between about 160 mm and 180 mm. \u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe correction is made for chips up to the full-format and perfect for the best known Kodak KAF 8300 chip.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003eConnection to camera: M63 x 1 ID-Thread\u003cbr\u003eConnection to telescope: M63 x 1 OD-Thread\u003cbr\u003eCoating: Fully multicoated\u003cbr\u003eHousing material: Aluminium\u003cbr\u003eRecommended distance from focal plane to connecting thread: watch PDF\u003cbr\u003eFocal length reduction: 0.75 x\u003cbr\u003eLenses: 3 Lenses\u003cbr\u003eOptical length without collimation flange: 180.05 mm\u003cbr\u003eOptical length with collimation flange: 189.05 mm\u003cbr\u003eFully corrected field: 40 mm\u003cbr\u003eLength: 71.7 mm (with Dustcaps 75 mm)\u003cbr\u003eDiameter: 67 mm\u003cbr\u003eWeight: 17.5 oz (with Dustcaps 18.9 oz)\u003c\/p\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967663960349,"sku":"APM-RIRED-M63-small","price":694.0,"currency_code":"CAD","in_stock":false}]},{"product_id":"apm-riccardi-reducer-m82","title":"APM Riccardi Reducer M82","description":"\u003c!-- more --\u003eAPM Riccardi Reducer M82","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664124189,"sku":"APM-RIRED-M82-large","price":830.0,"currency_code":"CAD","in_stock":false}]},{"product_id":"apm-riccardi-flattener-m82-m77-model-1","title":"APM Riccardi Flattener M82-M77-Model 1","description":"\u003c!-- more --\u003eAPM Riccardi Flattener M82-M77-Model 1","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664451869,"sku":"APM-RIFLAT1","price":690.0,"currency_code":"CAD","in_stock":false}]},{"product_id":"apm-riccardi-flattener-m82-m77-model-2","title":"APM Riccardi Flattener M82-M77-Model 2","description":"\u003c!-- more --\u003eAPM Riccardi Flattener M82-M77-Model 2","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664550173,"sku":"APM-RIFLAT2","price":690.0,"currency_code":"CAD","in_stock":false}]},{"product_id":"sky-watcher-esprit-120-0-77x-reducer-flattener","title":"Sky-Watcher Esprit 120 0.77x Reducer\/Flattener","description":"\u003c!-- more --\u003e\u003cp\u003e0.77x reducer for Esprit 120.\u003c\/p\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967731724573,"sku":"SW-S20209","price":730.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"sky-watcher-esprit-150-0-77x-reducer-flattener","title":"Sky-Watcher Esprit 150 0.77x Reducer\/Flattener","description":"\u003c!-- more --\u003e\u003cp\u003e0.77x reducer for Esprit 150.\u003c\/p\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967731757341,"sku":"SW-S20215","price":730.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"sky-watcher-evoguide-50ed-flattener","title":"Sky-Watcher Evoguide 50ED Flattener","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003eTransforms the Evoguide 50ED\/DX into a wide-field astrograph\u003c\/li\u003e\n  \u003cli\u003eProduces a 28mm corrected imaging circle for flat, sharp stars\u003c\/li\u003e\n  \u003cli\u003eStandard 17.5mm back focus simplifies camera and accessory spacing\u003c\/li\u003e\n  \u003cli\u003eOffers a massive 5.33° x 3.57° field of view with APS-C sensors\u003c\/li\u003e\n  \u003cli\u003eConnects securely via standard T-threads or a 1.25\" nosepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n  \u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n  \u003cli\u003eFAQ\u003c\/li\u003e\n  \u003cli\u003eSpecifications\u003c\/li\u003e\n  \u003cli\u003eIn the Box\u003c\/li\u003e\n  \u003cli\u003eDownloads\u003c\/li\u003e\n  \u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n  \u003cli class=\"active\"\u003e\n    \u003cdiv\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section-center\"\u003e\n          \u003ch2\u003eSky-Watcher Evoguide 50ED Flattener\u003c\/h2\u003e\n          \u003cp\u003eThe Sky-Watcher Evoguide 50ED Flattener unlocks the full astrophotography potential of the Evoguide 50ED and 50DX scopes, converting your high-end guidescope into a premium wide-field imaging instrument. This corrector produces a 28mm imaging circle, delivering pinpoint stars across the frame with cameras up to APS-C sensor size. With a generous 5.33° x 3.57° field of view on a crop-sensor camera and a standard 17.5mm back focus, it provides the optical correction needed to capture entire nebulae and star clusters in a single shot.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003e28mm Imaging Circle: Edge-to-Edge Star Correction\u003c\/h3\u003e\n          \u003cp\u003eThe primary function of this flattener is to eliminate the field curvature inherent in the Evoguide's fast optical system. It generates a 28mm corrected image circle, ensuring that stars in the corners of your frame are as sharp and round as those in the center. This level of correction is ideal for popular APS-C sized sensors, preventing elongated stars and allowing you to use the entire frame for your composition.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003e17.5mm Back Focus for Simplified Imaging Trains\u003c\/h3\u003e\n          \u003cp\u003eAchieving correct spacing is critical for any flattener, and this unit makes it simple with a 17.5mm back focus requirement. This distance is easily managed with standard T-thread extension rings and adapters for most modern CMOS and DSLR astronomy cameras. The fixed spacing removes the guesswork, letting you connect your camera and start imaging with confidence that your optics are correctly aligned for the flattest possible field.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003eDirect T-Thread Connection:\u003c\/strong\u003e The flattener features a male T-thread for a secure, rigid connection to your filter wheel, off-axis guider, or camera's T-ring adapter.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003e1.25\" Accessory Mount:\u003c\/strong\u003e For smaller guide cameras or planetary imagers, a 1.25\" opening provides a secondary connection method, adding flexibility to your setup.\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003eCapture Expansive Views: 5.33° x 3.57° on APS-C\u003c\/h3\u003e\n          \u003cp\u003eWhen paired with an APS-C camera, this flattener and the Evoguide 50ED create an imaging system with an immense 5.33° by 3.57° field of view. This is wide enough to frame the entirety of the Andromeda Galaxy (M31), the North American Nebula (NGC 7000), or the sprawling star-forming regions within the constellation Cygnus. It turns your guidescope into a dedicated, high-quality lens for capturing the largest deep-sky objects.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the Evoguide 50ED Flattener?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe Evoguide 50ED Flattener corrects for field curvature in the Sky-Watcher Evoguide 50ED and 50DX telescopes. Without it, stars at the edge of an image will appear stretched or out of focus. This accessory ensures sharp, pinpoint stars across a \u003cstrong\u003e28mm imaging circle\u003c\/strong\u003e, making the guidescope suitable for high-quality, wide-field astrophotography.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the required 17.5mm back focus for my camera?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe \u003cstrong\u003e17.5mm back focus\u003c\/strong\u003e is the distance from the flattener's rear T-thread to your camera's sensor. Most dedicated astronomy cameras have a sensor-to-flange distance of around 12.5mm or 17.5mm. You may need a small T-thread spacer to achieve the exact distance. For DSLRs, the standard 44mm flange distance of a Canon EF-mount or 46.5mm of a Nikon F-mount means you will need a specific T-ring adapter designed for this back focus, which is typically shorter than the standard 55mm setup.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a full-frame camera with the Evoguide 50ED Flattener?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eNo, this flattener is optimized for a \u003cstrong\u003e28mm imaging circle\u003c\/strong\u003e, which is best suited for sensors up to APS-C size. While a full-frame camera (which has a ~43mm diagonal) will physically connect, you will experience significant vignetting and distorted stars in the outer portions of the frame beyond the corrected circle.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of field of view can I expect with the Evoguide 50ED Flattener on the Heart Nebula (IC 1805)?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eUsing a camera with an APS-C sensor (like a ZWO ASI2600MC Pro or a Canon DSLR), the Evoguide 50ED with this flattener provides a field of view of \u003cstrong\u003e5.33° x 3.57°\u003c\/strong\u003e. This is an extremely wide field, perfect for capturing the entire Heart Nebula and its neighboring Soul Nebula (IC 1848) together in a single frame with room to spare.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect a guide camera like a ZWO ASI120MM Mini to the flattener?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe ZWO ASI120MM Mini has a 1.25\" form factor. You can insert it directly into the \u003cstrong\u003e1.25\" opening\u003c\/strong\u003e on the back of the flattener and secure it with the set screws. This allows you to use the Evoguide for both imaging and guiding simultaneously if you are using a separate, larger telescope as your main imaging scope.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eAre the dust caps on the Evoguide 50ED Flattener standard plastic caps?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eNo, the flattener comes with high-quality, threaded metal dust caps. These provide superior protection for the optics by screwing on securely, preventing them from falling off and ensuring a better seal against dust compared to standard push-fit plastic caps.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003ctable class=\"DAV-specifications\"\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eCompatibility\u003c\/td\u003e\n          \u003ctd\u003eSky-Watcher Evoguide 50ED, Sky-Watcher Evoguide 50DX\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eCorrected Imaging Circle\u003c\/td\u003e\n          \u003ctd\u003e28mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eBack Focus\u003c\/td\u003e\n          \u003ctd\u003e17.5mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eCamera Connections\u003c\/td\u003e\n          \u003ctd\u003eT-thread (M42x0.75), 1.25\" nosepiece receptacle\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eField of View (with APS-C Sensor)\u003c\/td\u003e\n          \u003ctd\u003e5.33° x 3.57°\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eCaps\u003c\/td\u003e\n          \u003ctd\u003eThreaded metal front and rear caps\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\n        \u003cimg class=\"DAV-img-box\" alt=\"Sky-Watcher Evoguide 50ED Flattener\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SW-S20214_1.jpg?v=1684877797\"\u003e\n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eEvoguide 50ED Flattener\u003c\/p\u003e\n          \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/li\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\n        \u003cimg class=\"DAV-img-box\" alt=\"Threaded Metal Dust Caps\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SW-S20214_3.jpg?v=1684877797\"\u003e\n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eThreaded Metal Caps\u003c\/p\u003e\n          \u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\n\u003ca href=\"https:\/\/www.skywatcherusa.com\/pages\/firmware-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Limited Warranty\u003c\/a\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967731855645,"sku":"SW-S20214","price":160.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"zwo-atmospheric-dispersion-corrector","title":"ZWO Atmospheric Dispersion Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects atmospheric dispersion for sharper planetary images\u003c\/li\u003e\n\u003cli\u003eUses two H-K9L prisms with 2° deviation angles\u003c\/li\u003e\n\u003cli\u003eFeatures 1\/10 wave optical accuracy to preserve resolution\u003c\/li\u003e\n\u003cli\u003e1.25” barrels with non-marring brass compression rings\u003c\/li\u003e\n\u003cli\u003eIndependent levers and a rotatable scale for precise adjustment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO ADC Atmospheric Dispersion Corrector\u003c\/h2\u003e\n\u003cp\u003eThe ZWO ADC Atmospheric Dispersion Corrector neutralizes the color fringing caused by Earth's atmosphere, sharpening planetary and lunar views. It uses two counter-rotating H-K9L prisms, each with a 2° deviation angle and polished to a 1\/10 wave accuracy, to recombine the dispersed spectrum of light back into a single, focused point. This correction is critical for high-resolution imaging, especially when planets are at low altitudes where dispersion is most severe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1\/10 Wave Correction for High-Resolution Imaging\u003c\/h3\u003e\n\u003cp\u003eAtmospheric dispersion acts like a weak prism, smearing a planet's light into a vertical rainbow that blurs fine detail. The ZWO ADC introduces an equal and opposite dispersion, effectively canceling the atmospheric effect. With optical surfaces polished to a 1\/10 wave accuracy, the ADC corrects this color separation without introducing its own aberrations, preserving the native resolution of your telescope and letting you resolve finer cloud bands on Jupiter or subtler crater details on the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecise Adjustment with a Rotatable 360° Scale\u003c\/h3\u003e\n\u003cp\u003eProperly using an ADC requires aligning its null point with the horizon and then adjusting the prisms to match the level of dispersion. The ZWO ADC simplifies this process with an intuitive control system. The rotatable scale and white locking screw let you easily set the horizontal \"zero\" position without rotating the entire ADC in your focuser. From there, two independent levers allow you to dial in the precise amount of correction needed, which you can see in real-time on your camera's live view.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSynchronized Levers:\u003c\/strong\u003e Overlapping slots allow the two prism levers to be moved together, simplifying the initial adjustment process.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotatable Scale:\u003c\/strong\u003e Lets you orient the measurement scale to the horizon, making it easy to set the levers symmetrically for optimal correction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Connections:\u003c\/strong\u003e Both the 1.25\" nosepiece and eyepiece holder use brass compression rings, ensuring a firm grip on your camera and accessories without scratching their barrels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWhen to Use the ZWO ADC\u003c\/h3\u003e\n\u003cp\u003eAn ADC is not always necessary, but it is an essential tool for dedicated planetary imagers. Its effect is most dramatic when a target is below 60 degrees of altitude. For observers in the northern hemisphere imaging Jupiter or Saturn during their low-altitude apparitions, an ADC is the difference between a soft, color-fringed image and a sharp, detailed one.\u003c\/p\u003e\n\u003cp\u003eThe primary trade-off is a minor reduction in light throughput from the extra glass. For bright targets like the planets and the Moon, this is insignificant compared to the massive gain in sharpness. However, for faint deep-sky objects where every photon counts and dispersion is less noticeable, an ADC is typically removed from the imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ZWO ADC improve planetary images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen light from a planet passes through Earth's atmosphere, it gets dispersed into a spectrum, causing a blue fringe on top and a red fringe on the bottom. This blurs the image. The \u003cstrong\u003eZWO ADC\u003c\/strong\u003e uses a pair of prisms to create an opposite dispersion effect, recombining the colors into a single sharp point and restoring fine detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO ADC necessary when planets are high in the sky?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen a celestial object is directly overhead (near the zenith), atmospheric dispersion is minimal, and an ADC provides little to no benefit. Its function becomes critical when objects are below about 60° altitude. The lower the object, the more atmosphere its light travels through, and the more valuable the ADC becomes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set up the ZWO ADC for imaging Jupiter from my backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, insert the ADC into your focuser and attach your camera. Point at Jupiter and achieve focus. Rotate the entire ADC until the adjustment levers are perfectly horizontal. Lock the rotatable scale so the \"0\" mark aligns with the levers. Then, slowly and symmetrically move the levers apart, watching your live view screen. You will see the red and blue color fringes merge and the image become noticeably sharper. Fine-tune for the best possible view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO ADC for visual observing with an eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While most commonly used for imaging, the ZWO ADC works perfectly for visual observation. Simply place it between the diagonal and your eyepiece. The improvement in sharpness and the reduction of color fringing on planets and the lunar limb will be immediately apparent, especially at high magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO ADC useful for deep-sky objects like galaxies or nebulae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. Atmospheric dispersion primarily affects very bright, sharp point-sources of light like stars and planets. Faint, diffuse deep-sky objects are not resolved with enough detail for dispersion to be a significant problem. The slight light loss from the ADC's prisms would be more detrimental than any minor sharpening benefit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the 2° prism deviation angle on the ZWO ADC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2° deviation angle determines the maximum amount of corrective power the ADC can apply. This value was chosen to be effective for correcting dispersion for planets even down to very low altitudes (e.g., 20-30 degrees) without being so aggressive that it becomes difficult to make fine adjustments for objects higher in the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-ADC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Material\u003c\/td\u003e\n\u003ctd\u003eH-K9L (BK-7 Equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Angle\u003c\/td\u003e\n\u003ctd\u003e2°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Surface Accuracy\u003c\/td\u003e\n\u003ctd\u003e1\/10λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003e1.25\" Barrel (Nosepiece \u0026amp; Holder)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZWO Atmospheric Dispersion Corrector\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cameracompany.com\/downloads\/1418\/ADC%20Quick%20Start%20Guide.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Quick Start Guide\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967733821725,"sku":"ZWO-ADC","price":209.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-ADC-1__01697.1649100925.1280.1280.jpg?v=1684345669"},{"product_id":"sharpstar-61edph-0-8x-focal-reducer","title":"SharpStar 61EDPH 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts the SharpStar 61EDPH to a fast f\/4.5 astrograph\u003c\/li\u003e\n\u003cli\u003eProvides a 44mm image circle for full-frame sensor coverage\u003c\/li\u003e\n\u003cli\u003eThree-element air-spaced optical design\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera integration\u003c\/li\u003e\n\u003cli\u003eWeighs only 0.45kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 61EDPH 0.8x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 61EDPH 0.8x Focal Reducer transforms its dedicated telescope into a fast f\/4.5 astrograph, using a three-element air-spaced optical design to deliver a flat 44mm image circle. This reducer provides a standard 55mm back focus for easy camera integration and adds only 0.45kg to your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAn f\/4.5 System for the 61EDPH\u003c\/h3\u003e\n\u003cp\u003eDesigned exclusively for the SharpStar 61EDPH and 61EDPH II refractors, this 0.8x reducer shortens the telescope's focal ratio from f\/5.5 to a significantly faster f\/4.5. This conversion allows you to capture the same amount of light in approximately 67% of the time, dramatically increasing your efficiency during short imaging nights and enabling deeper exposures on faint deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Flat 44mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe reducer's three-element, air-spaced optics are engineered to produce a corrected 44mm image circle. This is large enough to illuminate full-frame sensors (24x36mm) without significant vignetting, ensuring your images have even brightness from corner to corner. With full-surface multi-layer coatings, the system maintains high contrast and minimizes internal reflections for clean, sharp stars across the entire field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStandard 55mm Back Focus for Seamless Integration\u003c\/h3\u003e\n\u003cp\u003eThis reducer simplifies your imaging setup by providing the industry-standard 55mm back focus from its M48x0.75 camera connection threads. This spacing is designed to accommodate a wide range of DSLRs, mirrorless cameras, and dedicated astronomy cameras, with or without filter wheels and off-axis guiders. The robust mechanical design features a 65mm outer diameter and a total length of 95mm, integrating perfectly with the 61EDPH's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the SharpStar 61EDPH 0.8x Reducer do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt converts the SharpStar 61EDPH telescope into a faster photographic instrument. By reducing the focal ratio to \u003cstrong\u003ef\/4.5\u003c\/strong\u003e, it allows you to collect light more quickly, significantly shortening required exposure times for deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this SharpStar reducer with a telescope other than the 61EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This focal reducer is optically matched specifically for the SharpStar 61EDPH and 61EDPH II models. Using it with other telescopes will result in poor optical correction and will not produce a sharp, flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 61EDPH 0.8x Reducer work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is designed to produce a flat, well-illuminated \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to cover standard full-frame sensors (36mm x 24mm) without major vignetting, delivering sharp stars to the corners of your frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 61EDPH 0.8x Reducer affect my imaging time on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy speeding up the telescope to f\/4.5, you can capture the same signal-to-noise ratio in roughly two-thirds of the time it would take at the native f\/5.5. For example, a 3-minute exposure at f\/5.5 would only require a 2-minute exposure with the reducer to achieve similar brightness, allowing you to capture more data in a single night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a filter wheel with my astronomy camera. Does the SharpStar 61EDPH reducer have enough back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. It provides the standard \u003cstrong\u003e55mm of back focus\u003c\/strong\u003e from the base of its M48 threads. This is the industry-standard distance designed to accommodate common accessories like filter wheels, off-axis guiders, and spacers in your imaging train before the camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat threads are on the camera side of the 61EDPH reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe camera side of the reducer features a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. This is the common \"2-inch filter thread\" standard used by most dedicated astronomy cameras and full-frame camera adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSharpStar 61EDPH \u0026amp; 61EDPH II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eThree-element air-spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFull-surface multi-layer coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e65mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e95mm (including M48 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpStar 61EDPH 0.8x Focal Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967741063453,"sku":"SSO-SHRD61","price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-61EDPH-Reducer-1__99821.1608945453.1280.1280.jpg?v=1684345755"},{"product_id":"sharpstar-76edph-0-8x-focal-reducer","title":"SharpStar 76EDPH 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts 76EDPH to a fast f\/4.5 focal ratio\u003c\/li\u003e\n\u003cli\u003eProduces a 44mm image circle for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera integration\u003c\/li\u003e\n\u003cli\u003eThree-element air-spaced optical design\u003c\/li\u003e\n\u003cli\u003eAdds only 0.5kg to the imaging train\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 76EDPH 0.8x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 0.8x Focal Reducer is engineered specifically to convert the 76EDPH telescope into a fast f\/4.5 astrograph, illuminating a full 44mm image circle for large-format sensors. This three-element reducer provides a standard 55mm back focus from its M48 threads, measures 77mm in length, and adds only 0.5kg to your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTransform Your 76EDPH into an f\/4.5 Astrograph\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native focal ratio of the 76EDPH to f\/4.5, this corrector significantly shortens required exposure times, allowing you to capture more signal on faint deep-sky objects in a single session. The dedicated optical design is precisely matched to the 76EDPH, ensuring sharp stars across the entire field of view.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Design:\u003c\/strong\u003e Mates directly to the 76EDPH focuser via an M74×1 thread for a secure, flex-free connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree-Element Optics:\u003c\/strong\u003e The air-spaced triplet lens structure is fully multi-coated to maximize light transmission and suppress internal reflections for high-contrast images.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThis reducer delivers a corrected, flat field across a 44mm image circle, which is large enough to accommodate full-frame (24x36mm) CMOS and CCD sensors without significant vignetting. This allows you to capture expansive targets like the Andromeda Galaxy (M31) or the Rho Ophiuchi cloud complex in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Back Focus and 360° Rotation for Easy Framing\u003c\/h3\u003e\n\u003cp\u003eIntegration into your existing imaging setup is straightforward. The reducer provides the industry-standard 55mm of back focus from its M48x0.75 camera connection, accommodating most filter wheels, off-axis guiders, and astronomy cameras with minimal adapters. An integrated 360° rotator lets you perfectly frame your target without having to loosen the camera and risk optical tilt.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M48 Threads:\u003c\/strong\u003e The camera-side connection uses M48 threads, which also accept standard 2\" astronomy filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Composition:\u003c\/strong\u003e The built-in rotator allows for fine adjustments to your image orientation, a critical feature for capturing mosaics or aligning with celestial coordinates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 0.8x Reducer do for my SharpStar 76EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer transforms your SharpStar 76EDPH into a faster, wider imaging instrument. It changes the focal ratio to \u003cstrong\u003ef\/4.5\u003c\/strong\u003e, which reduces your exposure times by about 36% and provides a wider field of view to capture larger celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 76EDPH 0.8x Reducer work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is designed to produce a flat, corrected \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which fully illuminates standard 35mm full-frame sensors (e.g., Sony IMX571 or IMX455 based cameras) without significant light fall-off at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera and accessories to the SharpStar 76EDPH reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer has standard M48x0.75 male threads on the camera side and provides \u003cstrong\u003e55mm of back focus\u003c\/strong\u003e. This is the standard distance for many DSLR\/mirrorless cameras with a T-ring, as well as dedicated astronomy cameras when combined with filter wheels and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the 76EDPH 0.8x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the M48 threads on the camera side of the reducer are designed to accept standard \u003cstrong\u003e2\" (M48x0.75) filters\u003c\/strong\u003e. You can thread a filter directly onto the reducer before attaching your camera or filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the f\/4.5 focal ratio help when imaging faint targets like the North American Nebula (NGC 7000) with the 76EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe North American Nebula (NGC 7000) is a large, faint emission nebula. The faster \u003cstrong\u003ef\/4.5 focal ratio\u003c\/strong\u003e allows your camera sensor to collect photons more quickly compared to the telescope's native f-ratio. This means you can achieve a strong signal-to-noise ratio with shorter sub-exposures, reducing the demands on your mount's tracking accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm using an APS-C camera with my 76EDPH. Is the 44mm image circle of this reducer still beneficial?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While an APS-C sensor is smaller than the \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, using a reducer designed for a larger field ensures exceptional field flatness and star correction across your entire sensor. You will experience very tight, round stars from corner to corner, well within the \"sweet spot\" of the reducer's optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSharpStar 76EDPH Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003eThree-element air-spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm from M48 thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e77mm (including M48 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e88mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFull-surface multi-layer coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProduct Manuals\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDrivers \u0026amp; Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967749583133,"sku":"SSO-76EDPHFR","price":371.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-76EDPH-Reducer-1__79028.1609101546.1280.1280.jpg?v=1684345784"},{"product_id":"sharpstar-94edph-0-8x-focal-reducer","title":"SharpStar 94EDPH 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.8x Focal Reduction for SharpStar 94EDPH\u003c\/li\u003e\n\u003cli\u003eCreates a Fast f\/4.4 Optical System\u003c\/li\u003e\n\u003cli\u003e4-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e50mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 94EDPH 0.8x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThis dedicated 0.8x focal reducer transforms the SharpStar 94EDPH into a fast f\/4.4 imaging system, using a 4-element optical design to deliver a corrected 50mm image circle. The standard 55mm back focus simplifies camera and accessory integration, while the reducer itself has a maximum outside diameter of 88mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Faster, Wider Field: The 4-Element Design for f\/4.4 Imaging\u003c\/h3\u003e\n\u003cp\u003eBy reducing the focal ratio to f\/4.4, this accessory significantly shortens required exposure times, allowing you to gather more signal on faint targets in a single session. The wider field of view also makes it possible to frame large celestial objects, like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000), in their entirety.\u003c\/p\u003e\n\u003cp\u003eThe 4-element optical layout is engineered to correct for optical aberrations across the field, ensuring that stars remain sharp and round from the center to the edge of the frame. This corrective power is essential for maintaining the high image quality of the 94EDPH's triplet objective.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Ready: 50mm Image Circle and 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe reducer's optical design produces a fully illuminated and corrected 50mm image circle. This generous field is large enough to cover full-frame sensors (like the Sony a7 series or dedicated cameras with IMX571\/IMX455 sensors) without vignetting, maximizing the imaging potential of the telescope.\u003c\/p\u003e\n\u003cp\u003eA standard 55mm back focus distance simplifies the process of connecting most DSLRs, mirrorless cameras, and dedicated astronomy cameras along with their associated filter wheels or off-axis guiders. This industry-standard spacing ensures broad compatibility with your existing imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SharpStar 94EDPH reducer cover my full-frame camera sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e The reducer produces a \u003cstrong\u003e50mm image circle\u003c\/strong\u003e, which is more than large enough to fully illuminate a standard 36x24mm full-frame sensor without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this 0.8x reducer help when imaging a target like the Heart Nebula (IC 1805) with the 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer widens the field of view, allowing you to capture the entire expanse of large targets like the Heart Nebula in a single frame. It also speeds up the optics to \u003cstrong\u003ef\/4.4\u003c\/strong\u003e, reducing the exposure time needed to capture faint nebulosity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back focus of the SharpStar 94EDPH 0.8x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is \u003cstrong\u003e55mm\u003c\/strong\u003e. This is a standard distance for many imaging setups, making it easy to integrate with accessories like T-rings, filter wheels, and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 4-element design in the SharpStar 94EDPH reducer do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e4-element design\u003c\/strong\u003e acts as both a reducer and a field flattener. It is optically matched to the 94EDPH telescope to ensure stars are sharp and round across the entire 50mm image circle, correcting for field curvature and other off-axis aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the final focal ratio of the SharpStar 94EDPH when using this reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 0.8x reducer converts the SharpStar 94EDPH into a fast \u003cstrong\u003ef\/4.4\u003c\/strong\u003e imaging system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this reducer compatible with other telescopes besides the SharpStar 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer is specifically designed and optically matched for the SharpStar 94EDPH telescope. Using it with other telescopes is not recommended as it may not provide a fully corrected field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinal Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4 Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e88mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967749812509,"sku":"SSO-94EDPHFR","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-94EDPH-Reducer-1__36482.1609108367.1280.1280.jpg?v=1684345787"},{"product_id":"sharpstar-140ph-0-74x-focal-reducer","title":"SharpStar 140PH 0.74x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio to f\/4.8\u003c\/li\u003e\n\u003cli\u003e0.74x reduction factor\u003c\/li\u003e\n\u003cli\u003e3-element optical design\u003c\/li\u003e\n\u003cli\u003e44mm corrected image circle\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 140PH 0.74x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 140PH 0.74x Focal Reducer is a dedicated 3-element corrector that converts the 140PH APO into a faster f\/4.8 astrograph for wide-field imaging. It delivers a corrected 44mm image circle to illuminate full-frame sensors and maintains the standard 55mm back focus for easy integration with cameras, filter wheels, and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe SharpStar 140PH at f\/4.8: A 0.74x Focal Reducer\u003c\/h3\u003e\n\u003cp\u003eBy shortening the telescope's effective focal length by a factor of 0.74x, this reducer widens the field of view, allowing you to capture large celestial targets in a single frame. The resulting f\/4.8 focal ratio significantly cuts down required exposure times, enabling you to collect more signal on faint nebulae and galaxies in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e44mm Image Circle \u0026amp; 55mm Back Focus for Full-Frame Cameras\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern sensors, this reducer projects a fully illuminated and corrected 44mm image circle, providing edge-to-edge sharpness on full-frame (36x24mm) CMOS and CCD cameras. The industry-standard 55mm back focus simplifies your imaging train; simply add your camera and standard T-ring or filter wheel setup to achieve perfect spacing without complex calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the SharpStar 140PH 0.74x Reducer do to my telescope's performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer makes your SharpStar 140PH telescope \"faster\" by changing its focal ratio to \u003cstrong\u003ef\/4.8\u003c\/strong\u003e. This allows you to capture more light in shorter exposures and provides a wider field of view, which is ideal for large deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 44mm image circle of the 140PH Reducer large enough for my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e44mm image circle\u003c\/strong\u003e is specifically designed to fully illuminate the 43.3mm diagonal of a standard full-frame sensor (e.g., Sony IMX571, IMX455, or DSLR sensors) with corrected stars to the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the correct 55mm back focus with the SharpStar 140PH Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is measured from the rear flange of the reducer to your camera's sensor. This is a standard distance. For a DSLR, a standard 48mm T-ring typically provides the correct spacing. For dedicated astronomy cameras, you use a combination of included camera spacers, a filter wheel, and an off-axis guider to reach the 55mm total distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 0.74x reducer work with telescopes other than the SharpStar 140PH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this reducer is optically matched specifically for the SharpStar 140PH APO triplet refractor. Using it with other telescopes will likely result in poor image quality, field curvature, and other optical aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SharpStar 140PH 0.74x Reducer help when imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy (M31) is a very large target. The wider field of view provided by the \u003cstrong\u003e0.74x reducer\u003c\/strong\u003e allows you to capture the entire galaxy and its companions in a single frame with the 140PH. The faster \u003cstrong\u003ef\/4.8\u003c\/strong\u003e optics also let you capture faint outer dust lanes with shorter individual exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a filter wheel with the SharpStar 140PH reducer and my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e55mm back focus\u003c\/strong\u003e distance is designed to accommodate common accessories. For example, if your camera has a 17.5mm flange distance and your filter wheel is 20mm thick, you would need a 17.5mm spacer (17.5 + 20 + 17.5 = 55mm) to achieve perfect focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope\u003c\/td\u003e\n\u003ctd\u003eSharpStar 140PH APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.74x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3 Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e94mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpStar 140PH 0.74x Focal Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Drivers and Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967753580829,"sku":"SSO-140PHFR","price":615.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-140PH-Reducer-1__05468.1609108728.1280.1280.jpg?v=1684345788"},{"product_id":"sharpstar-mpcc-full-frame-coma-corrector","title":"SharpStar MPCC Full Frame Coma Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects coma in Newtonian reflectors from 150mm to 600mm aperture\u003c\/li\u003e\n\u003cli\u003eOptimized for fast focal ratios from f\/3 to f\/6\u003c\/li\u003e\n\u003cli\u003eProvides a 44mm image circle for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eMaintains native focal length with a 1.0x reduction factor\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus simplifies camera connection\u003c\/li\u003e\n\u003cli\u003eFeatures a 4-element quadruplet optical design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar MPCC Full Frame Coma Corrector\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar MPCC Full Frame Coma Corrector is engineered to eliminate coma in fast Newtonian reflectors, transforming them into flat-field astrographs. Its advanced quadruplet optical design delivers pinpoint stars across a full-frame 44mm image circle, supporting sensors in everything from 150mm to 600mm aperture telescopes. With a 1.0x magnification factor, this corrector maintains your telescope's native focal length and image scale, while the industry-standard 55mm back focus and 2\" barrel ensure seamless integration into your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuadruplet Correction for f\/3 to f\/6 Newtonians\u003c\/h3\u003e\n\u003cp\u003eThis corrector utilizes a four-element, air-spaced optical layout that includes an extra-low dispersion (ED) glass element. This sophisticated design provides a high degree of aberration control, effectively neutralizing the coma inherent in parabolic mirrors, especially those with aggressive focal ratios from f\/3 to f\/6. The result is a flat, sharp field from edge to edge, allowing you to use the full resolving power of your instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Image Circle and 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for modern astrophotography, the SharpStar MPCC illuminates a 44mm image circle, fully covering full-frame (36x24mm) DSLR and dedicated CMOS\/CCD cameras without vignetting. Full-surface multi-layer coatings maximize light transmission for brighter images and higher contrast. The corrector features a standard 55mm back focus, measured from the unit's flange, which perfectly matches the spacing required by a DSLR with a standard T-ring, simplifying setup and ensuring optimal correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Standard 2\" Barrel and 0.35kg Weight\u003c\/h3\u003e\n\u003cp\u003eMechanically, the corrector is built for broad compatibility and minimal impact on your setup. It slides into any standard 2\" (50.8mm) focuser and, at a weight of only 0.35kg, it avoids placing excessive strain on the drawtube or upsetting the telescope's balance. Its total length of 118.7mm is compact enough for most focusers to accommodate without running out of in-travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSharpStar 1.0x MPCC vs. 0.95x Corrector: Native Scale or Wider Field?\u003c\/h3\u003e\n\u003cp\u003eSharpStar offers two excellent coma correctors, and the choice depends entirely on your imaging goals. The 0.95x version provides a slight focal reduction, which makes your telescope faster and captures a wider field of view—ideal for large nebulae. This 1.0x MPCC, in contrast, preserves the telescope's native focal length. This is the better choice when you want to maintain the maximum image scale for resolving details in smaller galaxies, planetary nebulae, or globular clusters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat telescopes are compatible with the SharpStar MPCC Full Frame Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis coma corrector is designed for \u003cstrong\u003eparaboloid Newtonian reflectors\u003c\/strong\u003e with apertures ranging from \u003cstrong\u003e150mm to 600mm\u003c\/strong\u003e and fast focal ratios between \u003cstrong\u003ef\/3 and f\/6\u003c\/strong\u003e. It is not suitable for refractors, SCTs, or other telescope designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the required 55mm back focus with the SharpStar MPCC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is the industry standard for many imaging systems. A typical DSLR camera with a T-ring has a sensor distance of 55mm. For dedicated astronomy cameras, you will need to use a combination of extension tubes to achieve the precise 55mm distance from the corrector's rear flange to your camera's sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SharpStar MPCC fully illuminate my full-frame camera on a 10\" f\/4 Newtonian imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The corrector's \u003cstrong\u003e44mm image circle\u003c\/strong\u003e is specifically designed to cover full-frame sensors (which have a ~43mm diagonal) without vignetting. On an f\/4 system imaging a large target like the North American Nebula (NGC 7000), you can expect a flat, evenly illuminated field with sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I get this 1.0x SharpStar MPCC or the 0.95x version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose based on your primary imaging targets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.0x MPCC (this model):\u003c\/strong\u003e Best for maintaining your telescope's native image scale. Ideal for smaller targets like the Whirlpool Galaxy (M51) or the Ring Nebula (M57) where you want maximum resolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.95x Corrector:\u003c\/strong\u003e Best for maximizing your field of view and increasing the speed of your optical system. Ideal for very large targets or mosaics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar MPCC for visual observing with my 12\" f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is optimized for imaging, the corrector will work for visual use and will provide noticeably sharper stars at the edge of the field in a low-power, wide-field eyepiece. However, its primary function is astrophotography. You must also ensure your focuser has enough in-travel to accommodate the corrector's 118.7mm length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of a 'Quadruplet' design in the SharpStar MPCC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003equadruplet (4-element) design\u003c\/strong\u003e allows for a higher degree of optical correction than simpler two-element correctors. By using four lenses, including an ED glass element, the SharpStar MPCC can better control coma and other off-axis aberrations across a wide 44mm field, especially in very fast f\/3 or f\/4 Newtonians.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003e150mm - 600mm Paraboloid Reflectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio Range\u003c\/td\u003e\n\u003ctd\u003ef\/3 - f\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification \/ Reduction Factor\u003c\/td\u003e\n\u003ctd\u003e1.0x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eQuadruplet (4-Element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFull-surface multi-layer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e118.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.35kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967764066589,"sku":"SSO-SH1XMPCC","price":427.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-MPCC-1__11195.1609112656.1280.1280.jpg?v=1684345800"},{"product_id":"sharpstar-field-flattener-2","title":"SharpStar Field Flattener - 2\"","description":"\u003c!-- more --\u003e\u003cp\u003eDesigned to fully illuminate APS-C sensor on most APO refractors. The SharpStar 2\" field flattener has a M42x0.74 male thread to connect the camera and a back focus of 55mm.\u003c\/p\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967764132125,"sku":"SSO-FF2","price":168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-Field-Flattener-2-inch-1__99353.1609113629.1280.1280.jpg?v=1684345806"},{"product_id":"sharpstar-field-flattener-2-5","title":"SharpStar Field Flattener - 2.5\"","description":"\u003c!-- more --\u003e\u003cp\u003eDesigned to fully illuminate full frame sensor on most APO refractors. The SharpStar 2.5\" field flattener has a M69 male thread to connect the camera. It also comes with a 36.5mm adapter with a M48x0.75 thread to easily attach a camera to obtain a back focus of 55mm. A M68 male thread and a M63 female thread are on the telescope side.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_Field_Flattener_2_5_inch_Back_Focus.jpg?v=1684345787\" alt=\"\"\u003e\u003c\/p\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967764197661,"sku":"SSO-FF25","price":273.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-Field-Flattener-2-5-inch-1__98032.1609114067.1280.1280.jpg?v=1684345811"},{"product_id":"askar-2-5-f-3-9-full-frame-reducer-for-fra400-and-fra500","title":"Askar 2.5\" F\/3.9 Full Frame Reducer for FRA400 and FRA500","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio to a fast f\/3.9\u003c\/li\u003e\n\u003cli\u003e0.7x reduction factor\u003c\/li\u003e\n\u003cli\u003e44mm image circle fully illuminates full-frame sensors\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera connection\u003c\/li\u003e\n\u003cli\u003eIntegrated M48x0.75 thread for 2\" filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 2.5\" F\/3.9 Full Frame Reducer for FRA400 and FRA500\u003c\/h2\u003e\n\u003cp\u003eThe Askar 2.5\" F\/3.9 Full Frame Reducer transforms your Askar FRA400 or FRA500 astrograph into a significantly faster imaging system, achieving a final focal ratio of f\/3.9 with its 0.7x reduction factor. This 3-element, air-spaced optical design illuminates a full 44mm image circle, providing edge-to-edge sharpness on full-frame sensors while maintaining a standard 55mm back focus for straightforward integration of your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e0.7x Reduction for an f\/3.9 System\u003c\/h3\u003e\n\u003cp\u003eBy shortening the effective focal length of your telescope, this reducer dramatically increases the speed of your optical system. On an Askar FRA400, the focal length is reduced from 400mm to just 280mm, changing the native f\/5.6 ratio to a swift f\/3.9. This speed increase allows you to capture the same amount of signal in roughly half the time, maximizing your data acquisition during short imaging windows.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Corrected Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for large-format sensors, this reducer delivers a fully-corrected 44mm image circle. This ensures that you can utilize the entire field of view of your full-frame DSLR, mirrorless, or dedicated astronomy camera without significant vignetting or loss of star quality at the corners. It turns your astrograph into a true wide-field instrument capable of capturing vast nebulae and star fields in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Back Focus and Integrated 2\" Filter Threads\u003c\/h3\u003e\n\u003cp\u003eAskar designed this reducer for seamless integration into modern imaging setups. It features the industry-standard 55mm back focus, allowing you to connect most cameras and filter wheels with standard adapters. An integrated M48x0.75 thread at the front of the reducer provides a secure attachment point for any 2\" filter, enabling the use of light pollution or narrowband filters without adding complexity to your optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Askar F\/3.9 reducer do for my FRA400 or FRA500?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 0.7x reducer shortens your telescope's focal length, making it optically \"faster.\" For the FRA400, it changes the focal length to 280mm and the focal ratio to f\/3.9. This results in a wider field of view and significantly shorter exposure times needed to capture faint deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use full-frame cameras with the Askar F\/3.9 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is specifically designed to produce a corrected \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to cover standard full-frame sensors (typically 43.3mm diagonal) without vignetting. This ensures sharp stars across the entire frame of your large-format camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it difficult to connect my camera to the Askar F\/3.9 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, connection is straightforward. The reducer requires a standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e from the rear mounting flange to your camera sensor. This is the same spacing used by most DSLRs with a T-ring and many dedicated astronomy cameras with their included spacers, making it easy to achieve the correct distance for optimal performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does a 0.7x reducer affect my exposure times?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA faster focal ratio gathers light more quickly. Moving from f\/5.6 (on the FRA400) to f\/3.9 means your exposure times can be cut by more than half to achieve the same image brightness. A 5-minute sub-exposure at f\/5.6 is roughly equivalent to a 2.5-minute sub at f\/3.9.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I image the entire North America Nebula (NGC 7000) with an FRA400 and this reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this setup is ideal for such large targets. With the reducer, an FRA400 has a 280mm focal length. Paired with a full-frame sensor (like a Sony a7 series or ZWO ASI6200), this provides a field of view of approximately 7.3° x 4.9°, which is more than enough to comfortably frame the entire North America Nebula (NGC 7000) and the neighboring Pelican Nebula (IC 5070).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the best way to use 2\" filters with the Askar F\/3.9 reducer on my FRA500?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer features a built-in \u003cstrong\u003eM48x0.75 female thread\u003c\/strong\u003e on the telescope side. You can simply screw any standard 2\" mounted filter directly into the reducer before attaching it to your telescope. This places the filter in the optimal position within the light path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eF\/3.9 Full Frame Reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAskar FRA400, Askar FRA500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/3.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-element, air-spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 (for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e72mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 2.5\" F\/3.9 Full Frame Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967778976029,"sku":"ASK-ASKAR7256RD","price":384.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA400FR-1__39150.1610302783.1280.1280.jpg?v=1684345839"},{"product_id":"askar-3-f-3-9-full-frame-reducer-for-fra600","title":"Askar 3\" F\/3.9 Full Frame Reducer for FRA600","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces FRA600 focal ratio to F\/3.9\u003c\/li\u003e\n\u003cli\u003eDesigned for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eMaintains a standard 55mm backfocus\u003c\/li\u003e\n\u003cli\u003eFeatures integrated M48 (2-inch) filter threads\u003c\/li\u003e\n\u003cli\u003e3-inch barrel for a secure connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 3\" F\/3.9 Full Frame Reducer for FRA600\u003c\/h2\u003e\n\u003cp\u003eDesigned exclusively for the Askar FRA600 astrograph, this 3\" full-frame reducer transforms the telescope into a significantly faster F\/3.9 optical system. By reducing the focal length, this corrector provides a much wider field of view and cuts down exposure times, maintaining a standard 55mm backfocus for easy camera integration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTransform Your FRA600 into an F\/3.9 Astrograph\u003c\/h3\u003e\n\u003cp\u003eThis reducer converts your Askar FRA600 into a powerful, wide-field imaging instrument. The resulting F\/3.9 focal ratio allows you to gather significantly more light in a shorter period, enabling deeper exposures on faint nebulae and galaxies without taxing your mount's tracking accuracy over long sub-exposures. The wider field of view is essential for framing large-scale celestial objects in their entirety.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Backfocus and Full-Frame Illumination\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern astrophotography, the reducer provides the industry-standard 55mm backfocus. This simplifies the process of connecting your full-frame DSLR, mirrorless, or dedicated astronomy camera, ensuring you can achieve perfect spacing with common M48 rings and accessories. Its optical design is optimized to fully illuminate a full-frame sensor, delivering sharp, well-corrected stars across the entire image. For added convenience, the reducer includes built-in M48x0.75 threads for easy installation of 2-inch filters into your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of using the Askar F\/3.9 reducer with my FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is speed. By converting your FRA600 to F\/3.9, you can dramatically shorten exposure times. This allows you to collect the same amount of data in less time, improving your efficiency and resulting in images with a higher signal-to-noise ratio. It also provides a wider field of view, perfect for large targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Askar reducer maintain a flat field with full-frame sensors on the FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Askar 3\" F\/3.9 reducer is specifically designed as a \"full frame\" corrector for the FRA600. Its multi-element optical system is engineered to deliver a flat, corrected field that illuminates large sensors, ensuring sharp stars from the center to the corners of your image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar F\/3.9 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The reducer features integrated \u003cstrong\u003eM48x0.75 threads\u003c\/strong\u003e, which is the standard for 2-inch astronomy filters. You can directly screw in your favorite light pollution, narrowband, or LRGB filters without needing a separate filter drawer or wheel in some configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the backfocus of the Askar F\/3.9 reducer for the FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer is designed with a standard \u003cstrong\u003e55mm backfocus\u003c\/strong\u003e. This is measured from the rear flange of the reducer to the camera sensor. This standard distance makes it compatible with most dedicated astronomy cameras and DSLR\/mirrorless cameras when using the appropriate M48 T-ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar F\/3.9 reducer work with a camera and filter wheel combination on my FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, as long as your total imaging train length meets the 55mm backfocus requirement. You will need to account for the thickness of your filter wheel, off-axis guider (if any), and all adapters between the reducer and your camera's sensor. The standard 55mm spacing provides enough room for common accessory combinations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar F\/3.9 reducer help when imaging the Andromeda Galaxy (M31) with the FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy (M31) is a very large target. The standard FRA600 might frame the core tightly, but this F\/3.9 reducer widens the field of view significantly. This allows you to capture the full expanse of M31, including its faint outer arms and satellite galaxies M32 and M110, all within a single, well-composed shot on a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967779008797,"sku":"ASK-ASKAR656RD","price":615.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA600FR-1__09035.1610302990.1280.1280.jpg?v=1684345841"},{"product_id":"william-optics-adjustable-flat6aiii-for-flt91","title":"William Optics Adjustable Flat6AIII for FLT91","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDedicated Field Flattener for the William Optics FLT91 Telescope\u003c\/li\u003e\n\u003cli\u003eCorrects Field Curvature for Pinpoint Stars Edge-to-Edge\u003c\/li\u003e\n\u003cli\u003eIntegrated Adjustment Ring for Precise Back Focus Tuning\u003c\/li\u003e\n\u003cli\u003eIncludes Custom Adapter for a Secure Connection to the FLT91\u003c\/li\u003e\n\u003cli\u003eEnables Full-Frame Astrophotography with the FLT91\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Adjustable Flat6AIII for FLT91\u003c\/h2\u003e\n\u003cp\u003eOwners of the William Optics Fluorostar 91 refractor can achieve a perfectly flat photographic field with the dedicated Adjustable Flat6AIII corrector. This optical system is engineered specifically for the FLT91 to eliminate field curvature, rendering stars as sharp, pinpoint sources from the center to the very edge of the frame. The package includes the Flat6AIII flattener and the specific adapter ring for a seamless, rigid connection, with an integrated adjustment mechanism for precise back focus control.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAchieve a Perfectly Flat Field with the FLT91\u003c\/h3\u003e\n\u003cp\u003eWhile the FLT91 provides exceptional color correction, like all fast refractors, its native focal plane has a slight curvature. For visual use, this is unnoticeable, but for astrophotography, it results in slightly elongated stars in the corners of an image. The Flat6AIII is the matched solution, designed to counteract this specific optical characteristic, ensuring your images have a professional, uniformly sharp appearance across even large full-frame sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated Adjustment for a Versatile Imaging Train\u003c\/h3\u003e\n\u003cp\u003eThe \"Adjustable\" design of the Flat6AIII is its key mechanical advantage. It features a built-in, rotatable adjustment ring that allows you to dial in the perfect sensor-to-flattener distance for your specific camera, filter wheel, or off-axis guider setup. This eliminates the trial-and-error of finding the right combination of extension tubes and spacers, saving you valuable time in the field. This unit ships with the necessary adapter ring, ensuring a direct, secure, and perfectly centered attachment to the FLT91's focuser drawtube for a completely rigid imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the William Optics Adjustable Flat6AIII for the FLT91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eWilliam Optics Adjustable Flat6AIII\u003c\/strong\u003e is a dedicated field flattener designed for the FLT91 apo refractor. Its primary function is to correct for the natural field curvature of the telescope's optics, ensuring that stars are sharp and pinpoint across the entire image sensor, from the center to the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the \"adjustable\" feature of the Flat6AIII important for my FLT91 setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adjustable mechanism allows you to precisely set the back focus distance between the flattener's optics and your camera's sensor. This is critical because different cameras, filter wheels, and off-axis guiders create different optical path lengths. The adjustability ensures you can achieve perfect correction with your specific imaging train without needing a collection of separate spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate adapter to connect the Flat6AIII to my William Optics FLT91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This product package includes both the Flat6AIII flattener and the specific adapter ring required for a direct and secure connection to the William Optics FLT91 telescope's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Adjustable Flat6AIII help when imaging large targets like the Andromeda Galaxy (M31) with the FLT91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen imaging a large object like the Andromeda Galaxy (M31), you want the entire field to be perfect. Without the \u003cstrong\u003eFlat6AIII\u003c\/strong\u003e, the stars at the edges of the galaxy might appear soft or elongated. By flattening the field, this corrector ensures that every star in your frame is a sharp point, resulting in a much more professional and aesthetically pleasing final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Flat6AIII a focal reducer as well as a flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary design function of the Flat6AIII is field flattening. While some flatteners also offer focal reduction, this model is specified as a 1.0x flattener, meaning it is designed to correct aberrations without changing the native focal length or f-ratio of the FLT91 telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Adjustable Flat6AIII for FLT91 work with both DSLR and dedicated astronomy cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The adjustable back focus is specifically designed to accommodate the different flange distances of various cameras. Whether you are using a DSLR with a standard T-ring or a dedicated cooled astronomy camera with a filter wheel, you can tune the spacing for optimal optical performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics Adjustable Flat6AIII for FLT91\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics FLT91 Apochromatic Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Function\u003c\/td\u003e\n\u003ctd\u003eField Flattener (1.0x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKey Feature\u003c\/td\u003e\n\u003ctd\u003eIntegrated Adjustable Back Focus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eIncludes dedicated adapter for FLT91 focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967782187293,"sku":"WO-P-FLAT6AIII-M92","price":480.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-Adjustable-Flat6AIII-P-FLAT6AIII-1__21819.1596133240.1280.1280__76625.1614355641.1280.1280.jpg?v=1684345861"},{"product_id":"ts-optics-0-67x-reducer-for-rc-telescopes-2","title":"TS-Optics 0.67x Reducer for RC Telescopes - 2\"","description":"\u003c!-- more --\u003e\u003cp\u003e\u003cb itemprop=\"description\"\u003eThe 2\" CCD compressor reduces the focal length of telescopes with the factor 0.67x, thus allowing significantly shorter exposure times.\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e♦ The focal reducer is perfectly suitable for RC telescope. It also works good with Celestron EHD or Meade ACF telescopes or with refractors up to the focal ratio F\/9\u003cbr\u003e\u003cbr\u003e♦ The image field of DSLR cameras up to APS-C format is illuminated - full illumination up to 29 mm\u003cbr\u003e\u003cbr\u003e♦ Easy connection to the telescope via 2\" barrel\u003cbr\u003e\u003cbr\u003e♦ Optimal working distance from the M48x0.75 thread to the camera sensor is 85 mm - enough space for accessories like off-axis guider or filter wheel\u003cbr\u003e\u003cbr\u003e♦ 2\" filter thread at the telescope side\u003c\/p\u003e\u003ch2\u003eTS-Optics CCD telecompressor for Ritchey-Chrétien and other F\/18 to F\/8 telescopes\u003c\/h2\u003e\u003cp\u003e\u003cspan\u003eThe TS telecompressor CCD47 was developed for reducing the focal length of RC (Ritchey-Chrétien) telescopes. Practical tests have also shown an excellent suitability for all telescopes with flat field, like apochromats with built-in corrector lens, Celestron EHD or Meade ACF telescopes, thus the most flat-field telescopes. We especially recommend the compressor for the GSO \/ TS Optics \/ AstroTec Ritchey-Chrétien telescopes.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eThe features of the CCD47 telecompressor:\u003c\/h2\u003e\u003cp\u003e\u003cbr\u003e\u003cspan\u003e♦ Barrel size is 2\" - easy connection to all focusers with 2\" receptacle\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e♦ With thread for 2\" filters at the telescope side\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e♦ Camer aconnection via M48x0.75 thread\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e♦ Optimal working distance from the connection thread: 85 mm to the camera sensor. Between 70-90 mm, the results are very good.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e♦ Reduction by 0.67x - an RC with F\/8 changes to fast f\/5.3. A telescope with F\/10 still turns into F\/6.7. The exposure time will be more than halved!\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e♦ An illuminated image field of 29 mm allows using all camera sensors up to APS-C format.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eAdapter recommendations:\u003c\/h2\u003e\u003cp\u003e\u003cspan\u003eWith the long working distance, adaptation of all common cameras, no matter whether CCD or DSLR, is possible without any problems. Some examples of applications:\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e♦ DSLR camera - adaption via M48: TSVF230 and then the matching adapter from M48 to the camera, like the SKM48-EOS for connecting a Canon EOS\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e♦ CCD cameras via T2 connection: two adapters are possible for reducing the M48 thread to T2:\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eTSFA2 - adapter to T2 with 38.2 mm length. This is used for bridging optical path.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eTSM48-T2 - a short adapter with only 3.5 mm length. This is applied if accessories like off-axis guider and filter wheels should be used.\u003c\/span\u003e\u003c\/p\u003e\u003ctable cellpadding=\"4\"\u003e\u003ctbody\u003e\n\u003ctr class=\"bgltblue\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eBarrel size\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"stpage-bg\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eFilter thread\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003e2\" filter thread at the telescope side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"bgltblue\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eCamera connector\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 thread (male, 5 mm long)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"stpage-bg\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eBody length\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003e29.2 mm (w\/o male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"bgltblue\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eWorking distance\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003eBetween 70-90 mm - optimal results are achieved at approx. 85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"stpage-bg\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eFactor\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003e0.67x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"bgltblue\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eClear aperture\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"stpage-bg\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eCoating\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003eBest possible coating - guaranteed no reflexes or ghost images\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"bgltblue\"\u003e\n\u003ctd class=\"pr9\"\u003e\n\u003cb\u003eIllumination at f\/8\u003c\/b\u003e:\u003c\/td\u003e\n\u003ctd\u003eD=29 mm fully illuminated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"TS-Optics","offers":[{"title":"Default Title","offer_id":44967988298013,"sku":"TS-CCD47","price":399.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/TS-0-67x-Reducer-RC-CCD47__64846.1645046285.1280.1280.jpg?v=1684347665"},{"product_id":"starizona-hyperstar-v4-for-celestron-8","title":"Starizona HyperStar V4 for Celestron 8\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Ratio: f\/2.1\u003c\/li\u003e\n\u003cli\u003eFocal Length: 425mm\u003c\/li\u003e\n\u003cli\u003eCompatible Telescopes: Celestron 8\" Schmidt-Cassegrain (SCT) \u0026amp; EdgeHD 800\u003c\/li\u003e\n\u003cli\u003eLargest Usable Sensor: 27mm diagonal\u003c\/li\u003e\n\u003cli\u003eBackfocus Requirement: 39.8mm from adapter threads\u003c\/li\u003e\n\u003cli\u003eFilter Compatibility: 2\" \/ M48x0.75 mounted filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eImage an Entire Nebula in Minutes — The Starizona Hyperstar 8 Lens\u003c\/h2\u003e\n\u003cp\u003eThe Starizona Hyperstar 8 lens is built around a single, powerful trade-off: it converts your Celestron 8” SCT from a slow f\/10 visual instrument into a blazing fast f\/2.1 wide-field astrograph, enabling you to capture vast deep-sky objects with dramatically shorter exposure times. This patented corrector system replaces your secondary mirror, transforming your telescope's optical geometry to gather light more than 22 times faster than at its native focal ratio. For the SCT owner who wants to image large targets like the Andromeda Galaxy or the Veil Nebula complex without guiding for hours, the Hyperstar is the most direct path to acquiring deep, high-quality data.\u003c\/p\u003e\n\u003cp\u003eThe core advantage of this speed is the radical reduction in exposure time. An image that would require a 25-minute guided sub-exposure at f\/10 can be captured with equivalent signal in just 60 seconds at f\/2.1. This change makes unguided imaging not only possible, but practical. The demands on your equatorial mount's tracking accuracy are significantly reduced, and the risk of a passing cloud or satellite ruining a long sub-exposure is minimized. This workflow opens up serious deep-sky imaging to observers with lighter-duty mounts or those who prefer a simpler, more portable setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Patented f\/2.1 Corrector Lens System\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Hyperstar is a multi-element optical corrector. When placed at the front of the telescope, it intercepts the light cone from the primary mirror and corrects for the severe coma and field curvature that would otherwise make imaging at this focal ratio impossible. The result is a 425mm focal length system that produces a wide, flat, and sharp field of view, delivering pinpoint stars across a 27mm image circle, fully illuminating sensors like the popular ASI294MC Pro.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecise Collimation for Sharp Stars\u003c\/h3\u003e\n\u003cp\u003eBecause the Hyperstar becomes the primary optical element after the main mirror, its alignment is critical. The housing features an integrated collimation system with adjustment screws that allow you to precisely tilt the lens group. This ensures the optical axis of the Hyperstar is perfectly centered on your primary mirror's axis, a requirement for achieving sharp, symmetrical stars across the entire imaging field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIndependent Camera Rotation for Easy Framing\u003c\/h3\u003e\n\u003cp\u003eOnce you have achieved perfect focus and collimation, the last thing you want to do is disturb it. The Hyperstar lens assembly includes an independent camera rotation mechanism. This allows you to loosen a collar and turn your attached camera to perfectly frame your target without affecting the critical optical alignment, saving valuable time and preventing the frustration of having to re-collimate after a composition tweak.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStandard Camera Adapter and Backfocus\u003c\/h3\u003e\n\u003cp\u003eThe Hyperstar 8 ships with a standard camera adapter with M42x0.75 \"T-threads,\" compatible with a wide range of dedicated astronomy cameras. The optical design requires a precise backfocus distance of 39.8mm from the adapter's threads to the camera sensor. This distance is standard for many ZWO, QHY, and other cameras when their 17.5mm front ring is attached, simplifying the setup process.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSeamless 2-Inch Filter Integration\u003c\/h3\u003e\n\u003cp\u003eImaging from light-polluted skies or capturing narrowband data requires filters, and the Hyperstar system makes this easy. The included camera adapter features internal threads designed to accept standard 2-inch (M48) mounted filters. This allows you to use dual-band or narrowband filters to isolate Ha and OIII emissions, letting you capture detailed images of nebulae even from a suburban backyard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUniversal Compatibility with Celestron 8\" SCTs\u003c\/h3\u003e\n\u003cp\u003eStarizona has engineered the latest Hyperstar 8 to work with both classic, non-EdgeHD Celestron 8\" SCTs and the newer EdgeHD 800 models. The package includes a specific adapter ring that is used for EdgeHD optical tubes, ensuring a secure fit and correct optical spacing. This removes the guesswork and makes a single unit compatible with the vast majority of modern C8 telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Observational Experience: Capturing the Elephant's Trunk Nebula\u003c\/h3\u003e\n\u003cp\u003eWith the Hyperstar 8 installed on a C8 and a dual-band filter threaded into the adapter, framing IC 1396 is a completely different experience. At 425mm, the entire sprawling emission nebula and its dark globule structures fit comfortably on an APS-C sized sensor. A 90-second exposure is all it takes to reveal the intricate, glowing ridges of ionized hydrogen and the stark silhouette of the Elephant's Trunk itself, details that would require a much longer exposure and careful guiding at f\/10.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLimitations and Considerations\u003c\/h3\u003e\n\u003cp\u003eThe primary trade-off of the Hyperstar system is its location at the front of the telescope, which limits the size of the camera that can be used to avoid significant central obstruction. Large, cooled cameras with bulky bodies may block too much incoming light. It is also an imaging-only system; you cannot use an eyepiece with the Hyperstar lens. Switching back to visual use requires removing the Hyperstar and reinstalling the original secondary mirror.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Hyperstar 8 work with my Celestron EdgeHD 800?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the current version of the Hyperstar 8 is compatible with both standard Celestron 8\" SCTs and the EdgeHD 800 models. It includes a specific adapter ring required for use with an EdgeHD optical tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat camera backfocus do I need for the Hyperstar 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Hyperstar 8 requires a backfocus of 39.8mm. This is the distance from the top of the included M42 T-thread adapter to your camera's sensor. Many popular astronomy cameras have a native 17.5mm backfocus, which works with standard 21mm filter drawers to reach the correct spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a DSLR camera with the Hyperstar?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but it requires a specific DSLR camera adapter, sold separately, to achieve the correct backfocus. The large body of a DSLR will also create a larger central obstruction compared to a compact astronomy camera, which can affect image contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs guiding necessary when imaging with a Hyperstar?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most setups, no. The f\/2.1 focal ratio allows for very short exposures, typically 30 to 90 seconds. This is usually short enough that the inherent tracking precision of most equatorial mounts is sufficient, eliminating the need for a separate guide camera and software.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow difficult is it to switch between Hyperstar and regular f\/10 observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe process takes only a few minutes. You simply unscrew the Hyperstar lens from the front of the telescope and carefully thread the original secondary mirror back into place. The secondary mirror is indexed, so collimation is usually well-preserved.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the largest sensor I can use with the Hyperstar 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Hyperstar 8 has a fully illuminated and corrected image circle of 27mm. This is a perfect match for cameras with APS-C or smaller sensors, such as those with the IMX571, IMX294, or IMX533 chips.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e425mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eCelestron 8\" SCT and EdgeHD 800\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLargest Usable Sensor Diagonal\u003c\/td\u003e\n\u003ctd\u003e27mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackfocus (from mounting thread)\u003c\/td\u003e\n\u003ctd\u003e39.8mm (1.57\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Threads\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 (T-thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e2\" (M48x0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength (without camera adapter)\u003c\/td\u003e\n\u003ctd\u003e3.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e3.0\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eLess than 1 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHyperstar 8 Lens Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eStandard M42 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEdgeHD Adapter Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSecondary Mirror Storage Holder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003e2-Year Manufacturer Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":49476348543261,"sku":"STZ-HS4-C8HD-M42-17.5","price":1399.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Starizona-HyperStar-8in__38157.1651611969.1280.1280.jpg?v=1684347790"},{"product_id":"starizona-hyperstar-v4-for-celestron-9-25","title":"Starizona HyperStar V4 for Celestron 9.25\"","description":"\u003c!-- more --\u003e\u003cdiv id=\"shopify-section-static-product\" class=\"shopify-section product--section\"\u003e\u003csection class=\"product--container layout--two-col\" data-product-wrapper=\"\"\u003e\u003carticle class=\"prod-description\"\u003e\u003cdiv class=\"product-description rte\" data-product-description=\"\"\u003e\n\u003cb\u003eFeatures\u003c\/b\u003e\u003cbr\u003e\u003cp\u003eThe HyperStar 9.25 lens converts a standard Celestron 9.25\" SCT from f\/10 to f\/2.2, making the system 25 times faster. That means 25-times shorter exposures! Now you can capture deep-sky images without guiding and without an equatorial wedge (in alt-az configuration). The HyperStar lens shortens the focal length of the telescope, giving a much wider field of view, and giving a greater tolerance of tracking errors, allowing for unguided, alt-az imaging.\u003c\/p\u003e\n\u003cp\u003eThe HyperStar 9.25 is compatible with a variety of cameras, including CCD, CMOS and DSLRs. The HyperStar 9.25 covers up to a 28mm sensor size. Separate adapters are required for different cameras. One adapter is included with the HyperStar lens.\u003c\/p\u003e\n\u003cp\u003eOptical performance is excellent, with a coma-free, flat field of view up to 3 degrees wide.\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_HyperStar_Comparison_c925.jpeg?v=1684347765?v=1611704894\" alt=\"HyperStar Version Comparison\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFAQs\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDo I need the Filter Slider to use Filters with the HyperStar?\u003c\/b\u003e\u003cp\u003eNo, the standard camera adapter that comes with the HyperStar allows the use of one 2” mounted filter. This is ideal for light pollution or IR\/Cut filters when using a one-shot color camera. Although, the \u003ca href=\"https:\/\/starizona.com\/products\/starizona-filter-slider-complete-system\"\u003eFilter Slider\u003c\/a\u003e is ideal for quick filter changes when using a monochrome camera.\u003c\/p\u003e\n\u003cb\u003eAre HyperStars hard to focus?\u003c\/b\u003e\u003cp\u003eHyperStars are no more difficult to focus than any other optical system. HyperStars can be accurately focused with Bahtinov Masks, AutoFocusers (ie \u003ca href=\"https:\/\/starizona.com\/products\/microtouch-autofocuser-wired\"\u003eMicroTouch Autofocuser\u003c\/a\u003e), and any software that displays a Full-Width Half-Max star value. Although, the fast F\/Ratio does make the camera’s backfocus much more critical. This is why the HyperStar camera adapters need to be precisely within +- .5mm of the camera’s backfocus.\u003c\/p\u003e\n\u003cb\u003eWhy do I need to specify my mount type?\u003c\/b\u003e\u003cp\u003eWe ask for the mount type to determine if you’ll need a counterweight shipped with your HyperStar or not. GEM mounts can accommodate the balance of the HyperStar by shifting the scope forward or backward on the mount, whereas Fork Mounted telescopes can’t move on the mount and require a counterweight.\u003c\/p\u003e\n\u003cb\u003eWhat telescopes are compatible?\u003c\/b\u003e\u003cp\u003eFactory-equipped Fastar-compatible 9.25\" SCT telescopes have a removable secondary mirror assembly, allowing the use of the HyperStar C9.25 lens. Older 9.25\" SCTs are NOT compatible, nor can they be converted.\u003c\/p\u003e\n\u003cb\u003eWhy are the other HyperStar lenses faster?\u003c\/b\u003e\u003cp\u003eThe 9.25\" SCT uses a slightly different optical configuration, in order to produce a flatter field of view and have a smaller central obstruction. This means it uses a slower primary mirror (f\/2.2 versus the f\/2 mirror in other SCTs). This means the HyperStar has to be slightly slower to retain its excellent optical performance. The difference between f\/2.2 and f\/2 is negligible.\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003eWatch a HyperStar demo under light polluted skies using an Alt-Az mount. \u003cdiv class=\"fluid-width-video-wrapper\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/z4gj985zRns?rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003c\/section\u003e\u003c\/div\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Starizona","offers":[{"title":"No Filter Slider","offer_id":44968007663901,"sku":"STZ-HS4-C9.25","price":1679.0,"currency_code":"CAD","in_stock":true},{"title":"Add Filter Slider","offer_id":44968007696669,"sku":"STZ-HS4-C9.25-FS","price":1859.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Starizona-Hyperstar-Celestron-9-25__40693.1653511350.1280.1280.jpg?v=1684347781"},{"product_id":"askar-0-7x-universal-reducer-for-107phq-130phq-151phq","title":"Askar 0.7x Universal Reducer for 107PHQ\/130PHQ\/151PHQ","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.7x Focal Reduction Factor\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003eMaintains a Standard 55mm Backfocus\u003c\/li\u003e\n\u003cli\u003e3-Element Air-Spaced Design with ED Glass\u003c\/li\u003e\n\u003cli\u003eOptimized for Askar 107PHQ, 130PHQ, and 151PHQ Telescopes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 0.7x Universal Reducer for 107PHQ\/130PHQ\/151PHQ\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3” 0.7x Full-Frame Reducer transforms the 107PHQ, 130PHQ, and 151PHQ astrographs into faster, wider-field instruments perfect for deep-sky imaging. Its 3-element optical design incorporates ED glass to deliver a corrected 44mm image circle, while maintaining the industry-standard 55mm backfocus for easy integration with your existing camera and filter wheel setup. This reducer effectively shortens exposure times by increasing the light-gathering power of your f\/7 system to a rapid f\/4.9.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFaster Imaging at f\/4.9: A 0.7x Triplet ED Reducer\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native f\/7 focal ratio of the PHQ series telescopes to f\/4.9, this 0.7x reducer cuts required exposure times nearly in half. This allows you to gather more signal on faint targets in less time, maximizing your productivity during short imaging windows. The air-spaced triplet optical design, which includes one element of extra-low dispersion (ED) glass, ensures sharp, high-contrast images with excellent color correction across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Coverage: A Corrected 44mm Image Circle\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for large-format sensors, this reducer illuminates a 44mm image circle. This is large enough to cover full-frame (36x24mm) CMOS and CCD sensors without vignetting, ensuring your entire frame is evenly lit from corner to corner. You can capture vast nebulae like the Veil Nebula complex or the Andromeda Galaxy (M31) in their entirety, without sacrificing image brightness or star quality at the edges of your frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSeamless Integration: 55mm Backfocus and Multi-Thread Adapters\u003c\/h3\u003e\n\u003cp\u003eAskar designed this reducer for straightforward integration into any standard imaging train. It provides a precise 55mm backfocus, the common standard for DSLRs, mirrorless cameras, and dedicated astronomy cameras with a filter wheel. The reducer includes M68, M54, and M48 thread adapters, giving you the flexibility to connect to virtually any focuser, off-axis guider, or camera system without needing to source additional parts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Askar 0.7x reducer do to the focal length of the Askar 130PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 130PHQ has a native focal length of 1000mm at f\/7.7. The \u003cstrong\u003e0.7x reducer\u003c\/strong\u003e will shorten its focal length to 700mm and change the focal ratio to a much faster f\/5.4, allowing for wider fields of view and significantly shorter exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 0.7x reducer compatible with full-frame cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. It is designed to produce a corrected \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to fully illuminate a standard full-frame sensor (36x24mm) without significant vignetting, providing sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera to the Askar 0.7x Universal Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer is designed for a standard \u003cstrong\u003e55mm backfocus\u003c\/strong\u003e from its rearmost flange. It includes M68, M54, and M48 adapters, allowing you to directly connect most dedicated astronomy cameras, DSLRs (with a standard 44mm T-ring), and filter wheels using common extension tubes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer introduce chromatic aberration to my Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The reducer features a \u003cstrong\u003e3-element optical design that includes one ED (Extra-low Dispersion) glass element\u003c\/strong\u003e. This design actively corrects for chromatic aberration, ensuring that the excellent color fidelity of the 107PHQ's quadruplet objective is maintained.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 0.7x reducer help when imaging large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a telescope like the Askar 151PHQ (1057mm focal length), the native field of view is too narrow to frame the entire North American Nebula. By reducing the focal length to approximately 740mm, the \u003cstrong\u003e0.7x reducer\u003c\/strong\u003e expands the field of view, allowing you to capture the entire nebula and the adjacent Pelican Nebula (IC 5070) in a single shot with a full-frame camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar 0.7x reducer for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis accessory is designed and optically corrected specifically for astrophotography. While you might be able to reach focus with some long-focal-length eyepieces, it is not optimized for visual use and will likely result in suboptimal views. Its primary purpose is to create a flat, corrected field for a camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescopes\u003c\/td\u003e\n\u003ctd\u003eAskar 107PHQ, 130PHQ, 151PHQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-element air-spaced triplet with one ED element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackfocus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection to Focuser\u003c\/td\u003e\n\u003ctd\u003e3-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Thread Adapters\u003c\/td\u003e\n\u003ctd\u003eM68x1, M54x0.75, M48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Diameter\u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_2025_First_Half_Product_Collection_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968036466973,"sku":"ASK-ASF107130RE","price":538.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-PHQ-Reducer__94249.1657565838.1280.1280.jpg?v=1684348170"},{"product_id":"askar-0-76x-reducer-for-80phq","title":"Askar 0.76x Reducer for 80PHQ","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.76x reduction factor specifically for the Askar 80PHQ\u003c\/li\u003e\n\u003cli\u003eReduces focal ratio from f\/7.5 to a faster f\/5.7\u003c\/li\u003e\n\u003cli\u003eCreates a new focal length of 456mm\u003c\/li\u003e\n\u003cli\u003eGenerates a 44mm image circle, fully illuminating full-frame sensors\u003c\/li\u003e\n\u003cli\u003eMaintains a standard 55mm backfocus for easy camera connection\u003c\/li\u003e\n\u003cli\u003eFeatures an integrated M48x0.75 filter thread\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 0.76x Reducer for 80PHQ\u003c\/h2\u003e\n\u003cp\u003eThis Askar 0.76x Reducer is engineered specifically for the 80PHQ astrograph, transforming its native f\/7.5 optics into a faster f\/5.7 imaging system with a 456mm focal length. The 3-element air-spaced triplet design delivers a corrected 44mm image circle, fully illuminating full-frame sensors while maintaining a standard 55mm backfocus for straightforward integration with your camera and filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Triplet Design for f\/5.7 Speed and a 456mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eBy decreasing the focal ratio of the 80PHQ from f\/7.5 to f\/5.7, this 0.76x reducer shortens required exposure times by approximately 42%, allowing you to capture more signal in less time. The resulting 456mm focal length provides a wider field of view, ideal for framing large nebulae and star clusters. The internal 3-element triplet lens configuration ensures that the wider field remains sharp and well-corrected across the frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Imaging: 44mm Image Circle and Standard 55mm Backfocus\u003c\/h3\u003e\n\u003cp\u003eThe reducer is designed to produce a 44mm image circle, providing full, unvignetted illumination for cameras with full-frame (36x24mm) sensors. It connects directly to the 80PHQ's focuser and features a standard 55mm backfocus, simplifying the process of attaching a DSLR, mirrorless, or dedicated astronomy camera with the correct spacing. An integrated M48x0.75 (2-inch) filter thread allows you to easily add light pollution or narrowband filters into your imaging train without needing a separate filter drawer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Askar 0.76x Reducer do for my 80PHQ telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 0.76x Reducer converts your Askar 80PHQ from its native f\/7.5 focal ratio to a faster \u003cstrong\u003ef\/5.7\u003c\/strong\u003e. This shortens your exposure times and provides a wider field of view with a new focal length of \u003cstrong\u003e456mm\u003c\/strong\u003e, making it better suited for capturing large deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 44mm image circle of this reducer large enough for my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e44mm image circle\u003c\/strong\u003e is specifically designed to be larger than the diagonal of a standard full-frame sensor (which is approximately 43.3mm). This ensures your full-frame camera sensor is fully illuminated without vignetting caused by the reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera to the Askar 0.76x Reducer for the 80PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer provides a standard \u003cstrong\u003e55mm backfocus\u003c\/strong\u003e from its rearmost thread. This is the standard spacing for most cooled astronomy cameras when used with a filter wheel, or for a DSLR\/mirrorless camera with its corresponding M48 T-ring. You simply add the necessary M48 spacers to achieve the 55mm distance to your camera's sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-Q\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the f\/5.7 speed help when imaging the Andromeda Galaxy (M31) with the 80PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy (M31) is a very large target that benefits from the wider \u003cstrong\u003e456mm focal length\u003c\/strong\u003e. More importantly, the faster \u003cstrong\u003ef\/5.7\u003c\/strong\u003e optics gather light more quickly than the native f\/7.5, allowing you to capture the faint outer arms and dust lanes of the galaxy with shorter individual exposures, improving your overall signal-to-noise ratio in a single imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Askar 0.76x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer has a built-in \u003cstrong\u003eM48x0.75 (2-inch) filter thread\u003c\/strong\u003e on the camera side, allowing you to easily screw in standard 2-inch mounted filters for light pollution reduction or narrowband imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 0.76x reducer work on telescopes other than the Askar 80PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this reducer is specifically designed and optically matched to work with the Askar 80PHQ astrograph. Using it on other telescopes will likely result in poor optical correction, field curvature, and an inability to reach focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReducer Type\u003c\/td\u003e\n\u003ctd\u003e0.76x Focal Reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope\u003c\/td\u003e\n\u003ctd\u003eAskar 80PHQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Length\u003c\/td\u003e\n\u003ctd\u003e456mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-element, air-spaced triplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (2-inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e68mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 0.76x Reducer for 80PHQ\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968076083485,"sku":"ASK-ASKAR80R","price":368.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-80PHQ-Reducer__01912.1679584601.1280.1280.jpg?v=1684348743"},{"product_id":"askar-1x-field-flattener-for-103apo","title":"Askar 1x Field Flattener for 103APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects field curvature and coma for the Askar 103APO\u003c\/li\u003e\n\u003cli\u003eMaintains the native 700.4mm focal length and f\/6.8 ratio\u003c\/li\u003e\n\u003cli\u003eTriplet optical design delivers sharp stars edge-to-edge\u003c\/li\u003e\n\u003cli\u003eProvides a 44mm full-frame corrected image circle\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus from the M48 thread\u003c\/li\u003e\n\u003cli\u003eIncludes M54 and M48 camera adapters and a 2\" filter thread\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 1x Field Flattener for 103APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar 1x Field Flattener is engineered specifically for the 103APO refractor, correcting field curvature across a 44mm full-frame image circle while maintaining the telescope's native 700.4mm focal length and f\/6.8 focal ratio. This 0.58kg flattener utilizes a triplet optical design to deliver sharp stars to the edge of the frame and integrates into any standard imaging train with 55mm of back focus from its M48 male thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Flat Field for the Askar 103APO\u003c\/h3\u003e\n\u003cp\u003eThis flattener's primary function is to eliminate the field curvature and coma inherent in a refracting telescope, ensuring star points remain perfectly round across the entire sensor. The triplet air-spaced lens design achieves this correction over a 44mm image circle, making it an essential accessory for imagers using full-frame DSLR, mirrorless, or dedicated astronomy cameras with the Askar 103APO.\u003c\/p\u003e\n\u003cp\u003eBy using a 1x magnification factor, the flattener preserves the telescope's native 700.4mm focal length and f\/6.8 focal ratio. This allows you to capture wide-field targets with the maximum resolution and light-gathering power the 103APO optics can provide, but with the critical addition of a perfectly flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Back Focus and Standardized Connections\u003c\/h3\u003e\n\u003cp\u003eAskar designed this flattener for seamless integration into modern imaging setups. It provides the industry-standard 55mm of back focus measured from the base of its male M48x0.75 thread, which simplifies connecting most cameras and filter wheels without complex calculations. Simply add your camera's T-ring or standard spacers to reach the 55mm distance for optimal performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Adapters:\u003c\/strong\u003e The camera side includes both M54×0.75 and M48×0.75 threaded adapters, providing direct attachment for a wide range of cameras, filter drawers, and off-axis guiders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Filter Cell:\u003c\/strong\u003e A built-in M48x0.75 thread inside the adapter acts as a 2-inch filter cell, allowing you to mount light pollution or narrowband filters directly within the flattener itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Build:\u003c\/strong\u003e The entire housing is CNC-machined for precise optical alignment and weighs a solid 0.58kg, ensuring no flexure in the imaging train.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the Askar 1x Flattener for the 103APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 1x Flattener is designed to correct optical aberrations like \u003cstrong\u003efield curvature\u003c\/strong\u003e and \u003cstrong\u003ecoma\u003c\/strong\u003e in the Askar 103APO telescope. This ensures that stars are sharp and point-like across the entire imaging sensor, which is crucial for astrophotography, especially with large-format cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Askar 1x Flattener change the 103APO's focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. As a \u003cstrong\u003e1x flattener\u003c\/strong\u003e, it does not reduce or extend the focal length. When attached to the Askar 103APO, the telescope maintains its native \u003cstrong\u003e700.4mm focal length\u003c\/strong\u003e and \u003cstrong\u003ef\/6.8 focal ratio\u003c\/strong\u003e, simply delivering a corrected, flat field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat cameras are compatible with the Askar 1x Flattener's 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is compatible with most imaging systems. This includes:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDSLR and mirrorless cameras with a standard T-ring adapter.\u003c\/li\u003e\n\u003cli\u003eDedicated astronomy cameras when combined with the appropriate spacers to achieve the 55mm distance.\u003c\/li\u003e\n\u003c\/ul\u003e\nThe flattener includes both M54 and M48 threads to connect to a wide variety of accessories.\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 1x Flattener for the 103APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Askar 1x Flattener has a built-in \u003cstrong\u003eM48x0.75 filter thread\u003c\/strong\u003e on the camera side. This allows you to directly screw in standard 2-inch astronomy filters for light pollution suppression or narrowband imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 1x Flattener improve images of the Andromeda Galaxy (M31) with the 103APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA large target like the Andromeda Galaxy (M31) will stretch across the entire field of a full-frame sensor when imaged with the Askar 103APO. Without this flattener, stars at the edges of the galaxy would appear elongated or out of focus. The \u003cstrong\u003eAskar 1x Flattener\u003c\/strong\u003e ensures that the outer spiral arms and surrounding star fields of M31 are just as sharp as the galactic core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar 1x Flattener fully illuminate my full-frame sensor on an f\/6.8 system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The flattener is specifically designed to produce a corrected and illuminated \u003cstrong\u003e44mm image circle\u003c\/strong\u003e. This is large enough to cover a standard full-frame sensor (which has a 43.3mm diagonal) without vignetting, making it a perfect match for the Askar 103APO's f\/6.8 optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-Element Air-Spaced (Triplet)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e1x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope\u003c\/td\u003e\n\u003ctd\u003eAskar 103APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length with 103APO\u003c\/td\u003e\n\u003ctd\u003e700.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio with 103APO\u003c\/td\u003e\n\u003ctd\u003ef\/6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrected Image Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48x0.75 male thread base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Threads\u003c\/td\u003e\n\u003ctd\u003eM54x0.75 \u0026amp; M48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Filter Threads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (2-inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.58 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_103APO_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46861263405341,"sku":"ASK-ASKFL10310","price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO-Field-Flattener-ASKFL10310-1.png?v=1697487604"},{"product_id":"askar-0-8x-reducer-for-103apo","title":"Askar 0.8x Reducer for 103APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces telescope focal ratio to a faster f\/5.44\u003c\/li\u003e\n\u003cli\u003eShortens 103APO focal length to 560.32mm for wider fields\u003c\/li\u003e\n\u003cli\u003eTriplet optical design provides field flattening\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera connection\u003c\/li\u003e\n\u003cli\u003eIntegrated M48x0.75 threads for 2\" filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 0.8x Reducer for 103APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar 0.8x Reducer is engineered specifically for the Askar 103APO, transforming it into a faster f\/5.44 imaging system and shortening its focal length to 560.32mm for wider fields of view. This triplet reducer maintains a standard 55mm back focus from its M48 thread and weighs just 0.48kg, adding minimal load to the focuser while significantly increasing light-gathering speed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet Optics: A Faster f\/5.44 System for the 103APO\u003c\/h3\u003e\n\u003cp\u003eBy reducing the 103APO's native focal ratio to f\/5.44, this corrector significantly cuts down required exposure times, allowing you to capture more signal on faint targets in a single session. The triplet optical design also acts as a field flattener, ensuring sharp, point-like stars across a full-frame sensor, which is critical when imaging expansive targets like the North American Nebula (NGC 7000) or the Heart and Soul Nebulae (IC 1805 and IC 1848).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Connectivity: 55mm Back Focus for Standardized Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eThis reducer is designed for straightforward integration into your existing setup. It provides the industry-standard 55mm of back focus from the base of its M48 male thread, simplifying the connection of DSLRs (with a standard T-ring) and dedicated astronomy cameras with filter wheels and off-axis guiders. The rear of the reducer includes both M54×0.75 and M48×0.75 adapters, and a built-in M48×0.75 thread allows for direct installation of 2-inch filters without adding extra spacing components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Askar 0.8x Reducer do for my 103APO telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 0.8x Reducer shortens the focal length of your 103APO to \u003cstrong\u003e560.32mm\u003c\/strong\u003e and increases its speed to \u003cstrong\u003ef\/5.44\u003c\/strong\u003e. This provides a wider field of view, allowing you to fit larger celestial objects into your frame, and reduces exposure times, enabling you to collect data on faint nebulae and galaxies more efficiently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera to the Askar 103APO 0.8x Reducer to achieve the correct 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer provides \u003cstrong\u003e55mm of back focus\u003c\/strong\u003e from the base of the included M48 male adapter thread. To achieve this spacing, you simply add extension tubes or accessories between the reducer and your camera sensor until the total distance is 55mm. A typical DSLR with a T-ring already has approximately 55mm of spacing, making the connection direct.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 103APO 0.8x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer features an integrated \u003cstrong\u003eM48x0.75 female thread\u003c\/strong\u003e on the camera side, which is the standard for 2-inch astronomy filters. You can thread your filters directly into the reducer for light pollution suppression or narrowband imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 103APO 0.8x Reducer suitable for planetary imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically usable, a reducer is not ideal for planetary imaging. Reducers decrease focal length to capture wider fields, which is the opposite of the high magnification needed to resolve detail on planets like Jupiter and Saturn. For planetary work, you should use the Askar 103APO at its native focal length or with a Barlow lens to increase magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 103APO 0.8x Reducer improve imaging of large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt its native focal length, the Askar 103APO may be too narrow to frame the entire Andromeda Galaxy (M31) and its satellite galaxies with a larger sensor. By reducing the focal length to \u003cstrong\u003e560.32mm\u003c\/strong\u003e, the reducer widens the field of view, allowing you to capture the full galactic structure in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer provide a flat field for my full-frame DSLR or CMOS camera on the Askar 103APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003etriplet\u003c\/strong\u003e optical design of the Askar 0.8x Reducer is engineered to provide field flattening that illuminates a full-frame sensor. This ensures that stars remain sharp and round from the center of your image all the way to the corners, which is essential for creating high-quality astrophotographs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinal Focal Length (on 103APO)\u003c\/td\u003e\n\u003ctd\u003e560.32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinal Focal Ratio (on 103APO)\u003c\/td\u003e\n\u003ctd\u003ef\/5.44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48 thread base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.48 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Threads\u003c\/td\u003e\n\u003ctd\u003eM54×0.75, with M48×0.75 adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_103APO_0.8x_Reducer_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46861341458717,"sku":"ASK-ASKRE10308","price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO-0-8x-Reducer-ASKRE10308-1.png?v=1697488015"},{"product_id":"askar-0-6x-reducer-for-103apo","title":"Askar 0.6x Reducer for 103APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTransforms Askar 103APO to an f\/4.08, 420.24mm focal length system\u003c\/li\u003e\n\u003cli\u003eQuadruplet optical design provides field flattening for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera and accessory integration\u003c\/li\u003e\n\u003cli\u003eIncludes M68, M54, and M48 adapters for versatile camera connection\u003c\/li\u003e\n\u003cli\u003eIntegrated M48x0.75 thread for use with 2\" filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 0.6x Reducer for 103APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar 0.6x Reducer for 103APO transforms the telescope into a fast f\/4.08 astrograph, shortening the focal length to 420.24mm for capturing vast celestial targets. This dedicated quadruplet reducer is optically matched to the 103APO, delivering a flat field and maintaining sharp stars from edge to edge while adhering to a standard 55mm back focus distance for your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTransforming the 103APO to an f\/4.08 Astrograph\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native focal ratio to f\/4.08, this accessory dramatically cuts required exposure times, allowing you to gather more signal in less time. The quadruplet optical design not only reduces the focal length but also acts as a field flattener, correcting for optical aberrations and ensuring pinpoint stars across a wide, flat image circle suitable for full-frame cameras. At a focal length of 420.24mm, you can frame large emission nebulae like the North American Nebula (NGC 7000) or the entire Andromeda Galaxy (M31) with ease.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Detachable-Tube Design for f\/4 Speed\u003c\/h3\u003e\n\u003cp\u003eAchieving this faster focal ratio requires a unique mechanical integration with the Askar 103APO. To use the 0.6x reducer, you must detach the rear section of the main telescope tube, effectively shortening the instrument to achieve focus. This purpose-built design ensures perfect spacing and optical alignment. The reducer itself adds 0.98kg to your imaging setup, a factor to consider when balancing your mount for precise tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Back Focus with M48, M54, and M68 Adapters\u003c\/h3\u003e\n\u003cp\u003eThe Askar 0.6x Reducer simplifies camera connection by using the industry-standard 55mm back focus distance from the base of its M48 male thread. This compatibility works seamlessly with most DSLRs (with a standard T-ring) and dedicated astronomy cameras. For maximum flexibility, the reducer includes a set of adapters for M68×1, M54×0.75, and M48×0.75 threads, ensuring you can connect a wide variety of cameras, filter wheels, and off-axis guiders. The M48 adapter also features an internal thread for mounting 2-inch filters directly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 0.6x reducer change the Askar 103APO's imaging characteristics?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt transforms the Askar 103APO into a faster, wider-field instrument. The focal ratio is reduced to \u003cstrong\u003ef\/4.08\u003c\/strong\u003e and the focal length to \u003cstrong\u003e420.24mm\u003c\/strong\u003e. This allows for significantly shorter exposure times and the ability to frame much larger deep-sky objects in a single shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to modify my Askar 103APO to use this 0.6x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Askar 103APO features a detachable tube design specifically for this reducer. You must remove the rear section of the optical tube to shorten the telescope, which allows the reducer to reach focus and function correctly. This is a required step for proper installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for the Askar 103APO 0.6x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is a standard \u003cstrong\u003e55mm\u003c\/strong\u003e. This distance is measured from the base of the M48 male thread on the reducer to your camera's sensor. Most dedicated astronomy cameras and DSLR\/mirrorless cameras with T-rings are designed around this standard distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the Askar 103APO 0.6x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The included M48 adapter has an internal \u003cstrong\u003eM48×0.75 thread\u003c\/strong\u003e, which allows you to screw in standard 2-inch astronomy filters directly. This is ideal for adding light pollution or narrowband filters to your imaging train without needing a separate filter drawer or wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 103APO 0.6x reducer help when imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe North American Nebula is a very large target, spanning several degrees of the sky. The reducer's \u003cstrong\u003e420.24mm\u003c\/strong\u003e focal length provides a much wider field of view than the native 103APO, allowing you to capture the entire nebula and the adjacent Pelican Nebula (IC 5070) in a single frame with most full-frame or APS-C sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the f\/4.08 speed from this Askar reducer beneficial for imaging broadband targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The fast \u003cstrong\u003ef\/4.08\u003c\/strong\u003e focal ratio gathers light much more quickly than the native telescope. When imaging a broadband target like M31, this means you can capture faint outer dust lanes and details with shorter individual sub-exposures, improving your signal-to-noise ratio and reducing the impact of tracking errors or changing sky conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eQuadruplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.6x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length (103APO)\u003c\/td\u003e\n\u003ctd\u003e420.24mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio (103APO)\u003c\/td\u003e\n\u003ctd\u003ef\/4.08\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from base of M48 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection Threads\u003c\/td\u003e\n\u003ctd\u003eM68×1, M54×0.75, M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (internal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.98kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_103APO_0.6x_Reducer_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46861375701277,"sku":"ASK-ASKRE10306","price":461.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO-0-6x-Reducer-ASKRE10306-1.png?v=1697488274"},{"product_id":"starizona-sct-corrector-lf-large-format-reducer-coma-corrector","title":"Starizona SCT Corrector LF - Large Format Reducer\/Coma Corrector","description":"\u003c!-- more --\u003e\u003cspan data-mce-fragment=\"1\"\u003eStarizona's SCT Corrector has been an incredibly popular focal reducer and coma corrector, giving astrophotographers with standard Schmidt-Cassegrain telescopes an improved optical system and wider field of view, with increased photographic speed. Starizona now offers a large-format version, the SCT Corrector LF, designed to cover full-frame (35mm format) sensors.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe SCT Corrector LF is designed for Celestron 11\" and 14\" standard SCTs. Designed to thread directly onto the large 3.29\" threads on the rear cell of C11 and C14 telescopes, the larger optical elements of the SCT Corrector LF minimize the vignetting over large sensors. Remaining vignetting over a large field is minimal and limited only by the telescope baffles, which are designed for a slower focal ratio; but this vignetting is easily removed by using flat field images. Sharpness is excellent over a 42mm diagonal, with spots sizes up to 9x smaller than the native telescope! The focal ratio is reduced to f\/7.2 on the C14 and f\/7 on the C11, for a speed increase of 2.1x and 1.9x, respectively.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe SCT Corrector LF is designed to increase the available backfocus compared to Starizona's standard SCT Corrector. Backfocus is 146, accommodating a variety of accessories. The rear threads on the SCT Corrector LF are the same 3.29\" threads as on the rear cell of the C11 and C14 telescopes, so standard accessories are easily attached.\u003c\/p\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":46905837224221,"sku":"STZ-SCTCORR-LF","price":699.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_652efa4f-9b28-4dc4-92b7-6752d1ea89a7.jpg?v=1698090461"}],"url":"https:\/\/davidastro.com\/collections\/correctors-and-reducers.oembed?page=4","provider":"David Astro","version":"1.0","type":"link"}