{"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":"qhyccd-m42m-canon-10mm-adapter","title":"QHYCCD M42(M) Canon 10mm Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EF Lenses to M42 Female Threads\u003c\/li\u003e\n\u003cli\u003eProvides a Fixed 10mm Optical Path Length\u003c\/li\u003e\n\u003cli\u003eM42x0.75 Male \"T-Thread\" Interface\u003c\/li\u003e\n\u003cli\u003eEnables Wide-Field Imaging with Photographic Lenses\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\u003eQHYCCD M42(M) Canon 10mm Adapter\u003c\/h2\u003e\n\u003cp\u003eThe QHYCCD M42(M) Canon 10mm Adapter connects Canon EF-mount lenses to any camera or accessory with a female M42x0.75 thread. This adapter provides exactly 10mm of optical path length, which is critical for achieving correct back focus with specific QHYCCD cameras and filter wheel 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\u003eAdapt Canon EF Lenses with a Precise 10mm M42 Connection\u003c\/h3\u003e\n\u003cp\u003eThis adapter allows you to repurpose high-quality Canon EF-mount photographic lenses for astrophotography with your QHYCCD camera. By providing a standard male M42x0.75 \"T-thread\" interface, it opens up wide-field imaging possibilities, from capturing the full expanse of the Andromeda Galaxy (M31) to sweeping vistas of the Milky Way.\u003c\/p\u003e\n\u003cp\u003eThe core function of this adapter is to establish a precise 10mm spacing in the optical path. This fixed distance is an essential component for building imaging trains that achieve correct back focus, ensuring sharp stars across the entire field when combined with specific QHYCCD cameras and accessories.\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 QHYCCD M42(M) Canon 10mm Adapter used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt connects a \u003cstrong\u003eCanon EF-mount lens\u003c\/strong\u003e to a camera or accessory with female \u003cstrong\u003eM42 T-threads\u003c\/strong\u003e, adding exactly \u003cstrong\u003e10mm\u003c\/strong\u003e to the optical path. This is ideal for using photographic lenses for wide-field astrophotography with cooled astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the QHYCCD 10mm adapter to image the Rho Ophiuchi cloud complex?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a wide target like the Rho Ophiuchi region, you would attach a fast Canon EF lens (e.g., a 135mm or 200mm lens) to this adapter. The adapter then threads onto your QHYCCD camera, letting you use the lens's wide field of view to capture the entire nebula complex. The fixed \u003cstrong\u003e10mm spacing\u003c\/strong\u003e is a key part of the calculation for achieving sharp focus from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the QHYCCD M42 Canon adapter support electronic aperture or autofocus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This is a purely mechanical adapter. It provides a secure physical connection and precise spacing but does not have electronic contacts to transmit data. Focus and aperture must be set manually on the lens itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"10mm\" in the QHYCCD M42 Canon Adapter's name refer to?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"10mm\" specifies the optical path length, or thickness, of the adapter. When inserted into your imaging train, it increases the distance between the lens and the camera sensor by exactly 10mm, a critical value for back focus calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this QHYCCD adapter with a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this adapter is designed to be used as part of an imaging train that may include a filter wheel. You would typically place it between the Canon lens and the filter wheel, ensuring the total back focus distance matches your camera's requirement. You must account for the \u003cstrong\u003e10mm path length\u003c\/strong\u003e of this adapter when calculating your total spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the QHYCCD M42 adapter compatible with Canon EF-S lenses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed for the Canon EF mount. While EF-S lenses can physically attach to an EF mount, their rear elements often protrude further back. This could potentially interfere with filters or the camera's optical window. It is recommended for use with full-frame compatible \u003cstrong\u003eEF lenses\u003c\/strong\u003e to ensure clearance.\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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/qhyccd-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eQHYCCD Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"QHYCCD","offers":[{"title":"Default Title","offer_id":44967211532573,"sku":"QHY-020072","price":49.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/QHY-Adapters-Canon_Lens_Adapter-020071_600px__18358.1560934073.1280.1280__84725.1642535653.1280.1280.jpg?v=1684339207"},{"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":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables use of one SIPS optical unit on multiple telescopes\u003c\/li\u003e\n\u003cli\u003eDesigned for the Starlight Integrated Paracorr System (SIPS)\u003c\/li\u003e\n\u003cli\u003eMaintains precise optical spacing to eliminate re-tuning\u003c\/li\u003e\n\u003cli\u003eCompatible with a 2\" Feather Touch focuser\u003c\/li\u003e\n\u003cli\u003eRequires 1.5\" of draw tube travel\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\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\u003eStarlight Instruments Housing Only w\/o SIPS Optics\u003c\/h2\u003e\n\u003cp\u003eThe Starlight Instruments Housing for SIPS Optics is the dedicated solution for using a single SIPS optical unit on multiple telescopes, each outfitted with a compatible 2\" Feather Touch Focuser with 1.5\" of draw tube travel, preserving the critical optical spacing without requiring you to re-tune the corrector.\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\u003eOne SIPS, Multiple Telescopes: The 1.5\" DTT SIPS Housing Solution\u003c\/h3\u003e\n\u003cp\u003eFor astronomers with more than one Newtonian telescope, this housing provides a cost-effective way to leverage a single Starlight Integrated Paracorr System (SIPS) across all of them. Instead of purchasing a complete SIPS unit for each scope, you can install this housing on your secondary telescope, allowing for a quick and simple transfer of the SIPS optical element itself.\u003c\/p\u003e\n\u003cp\u003eThe process is straightforward: simply unscrew the optics from the SIPS unit on one scope and thread them into this housing on another. This approach makes high-end coma correction more economical for observers who use different instruments for different targets, as long as each is equipped with a 2\" Feather Touch focuser with 1.5\" of draw tube 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\u003ePreserve Optical Tuning with a 2\" Feather Touch Focuser\u003c\/h3\u003e\n\u003cp\u003eThe primary benefit of the SIPS is that it fixes the Tele Vue Paracorr Type 2 optics at the optimal distance from the primary mirror, eliminating the need for constant adjustment. This housing is machined to the same precise tolerances as the original SIPS body, ensuring that once your optics are installed, the critical spacing is perfectly maintained.\u003c\/p\u003e\n\u003cp\u003eThis guarantees that your coma correction remains consistent and effective every time you move the optical unit between telescopes. There is no need to \"re-tune\" or recollimate the corrector, allowing you to efficiently switch between your imaging and visual setups without sacrificing optical integrity. The housing integrates seamlessly with the specified 2\" Feather Touch focuser body.\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 Starlight Instruments SIPS Housing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis housing allows an astronomer who owns one Starlight Integrated Paracorr System (SIPS) to use its optical element on a second or third telescope. By installing a housing on each scope, you can quickly move the expensive corrector optics between them without buying a complete SIPS unit for each instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich focuser is compatible with this SIPS Housing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis housing is specifically designed for use with a \u003cstrong\u003e2\" Feather Touch focuser\u003c\/strong\u003e that has \u003cstrong\u003e1.5\" of draw tube travel\u003c\/strong\u003e. It is not compatible with other focuser models or draw tube lengths.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to buy new optics for this SIPS Housing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this product is the \u003cstrong\u003ehousing only\u003c\/strong\u003e. It is intended for users who already own a complete SIPS unit and want to use its existing optical element (the Tele Vue Paracorr Type 2 corrector) in another telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to \"re-tune\" my SIPS optics every time I move them?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The housing is precision-machined to maintain the exact optical spacing required by the SIPS. Once the optics are installed in the housing, the system is correctly tuned, and you can move the optical assembly between housings without any further adjustment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 12.5\" Newtonian with a 2\" Feather Touch focuser and want to use my SIPS on a second 20\" Dobsonian, also with a compatible 2\" Feather Touch. Is this SIPS housing the right part?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the exact scenario this product is designed for. As long as both telescopes have a 2\" Feather Touch focuser with 1.5\" of draw tube travel, you can install this housing on the 20\" Dobsonian and easily transfer your SIPS optics from the 12.5\" scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I install this SIPS Housing on my 16\" f\/4 Dobsonian, will moving the optics affect my primary mirror collimation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Moving the SIPS optical element between housings is done entirely at the focuser. It does not interact with or affect the alignment of your telescope's primary or secondary mirrors. Your primary mirror collimation remains unchanged.\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 Focuser\u003c\/td\u003e\n\u003ctd\u003e2\" Feather Touch with 1.5\" draw tube travel\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starlight_Instruments_SIPS_Installation_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 SIPS 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\/starlight-instruments-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarlight Instruments 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\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":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIntegrates Tele Vue's renowned Paracorr Type 2 coma-correcting optics\u003c\/li\u003e\n\u003cli\u003eFunctions as a stationary, non-adjustable corrector for maximum rigidity\u003c\/li\u003e\n\u003cli\u003eDesigned exclusively for the 2\" Feather Touch focuser with 1.5\" of draw tube travel\u003c\/li\u003e\n\u003cli\u003eEliminates the need to re-tune the corrector when changing eyepieces\u003c\/li\u003e\n\u003cli\u003eReduces system flexure for sharper, more consistent imaging results\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\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\u003eStarlight Instruments SIPS Coma Corrector\u003c\/h2\u003e\n\u003cp\u003eThe Starlight Instruments SIPS (Starlight Integrated Paracorr System) combines Tele Vue's benchmark Paracorr Type 2 optics with a custom Starlight Instruments housing, creating the ultimate fixed coma corrector for fast Newtonian telescopes. Designed for the 2\" Feather Touch focuser with 1.5\" of draw tube travel, this system locks the corrector at the perfect optical distance, eliminating adjustment errors and mechanical flexure entirely.\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 Optical Core: An Integrated Tele Vue Paracorr Type 2\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the SIPS are the legendary Tele Vue Paracorr Type 2 optics. This lens group is the industry standard for correcting coma, the optical aberration in fast parabolic mirrors that renders stars at the edge of the field as distracting, comet-like shapes. By integrating these world-class optics, the SIPS ensures that your f\/3 to f\/5 Newtonian delivers pinpoint stars across the entire field of view, from the center to the extreme 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\u003eThe Mechanical Advantage: A Fixed System for the 2\" Feather Touch Focuser\u003c\/h3\u003e\n\u003cp\u003eThe true innovation of the SIPS is its mechanical design. Instead of a sliding, adjustable mechanism, Starlight Instruments has fixed the Paracorr Type 2 optics inside a rigid housing made specifically for their 2\" Feather Touch focuser. This set-and-forget system means that once installed, the corrector is always at the optimal spacing, delivering perfect correction without any user intervention. You simply focus your eyepiece or camera, saving valuable time and eliminating a common source of setup frustration.\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\u003eSIPS vs. Standard Paracorr: Eliminating Flexure and Adjustment Hassles\u003c\/h3\u003e\n\u003cp\u003eWhile a standard, tunable Paracorr offers the flexibility to be used in various focusers, that adjustability introduces complexity and potential flexure. The SIPS is a dedicated solution that trades universal compatibility for absolute performance and ease of use on its target instrument.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero Readjustment:\u003c\/strong\u003e With a standard Paracorr, you must fine-tune the corrector's position for different eyepieces. The SIPS requires no such adjustment; you just focus the focuser, making eyepiece swaps fast and foolproof.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Flexure:\u003c\/strong\u003e By creating a single, rigid unit, the SIPS provides a much more solid connection to the imaging train than a corrector held in place by thumbscrews. This is critical for astrophotography, where any amount of tilt or flex can compromise star shapes.\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 problem does the Starlight Instruments SIPS solve?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SIPS solves the problem of coma in fast Newtonian reflectors while also eliminating the mechanical flexure and adjustment hassles of traditional, non-integrated coma correctors. It provides a rigid, set-and-forget solution for achieving perfectly round stars across the entire field of view, especially for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich focuser is the SIPS compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Starlight Instruments SIPS is specifically designed to be used with a \u003cstrong\u003e2\" Feather Touch focuser that has 1.5\" of draw tube travel\u003c\/strong\u003e. It is not compatible with other focuser models or brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SIPS for imaging deep-sky objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SIPS is ideal for imaging objects like the Orion Nebula (M42) with a fast Newtonian. Its rigid, flex-free design ensures that the heavy cameras often used for deep-sky imaging are held securely, preventing tilt and maintaining 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\"\u003eDo I need to adjust the SIPS when switching from a low-power eyepiece to a high-power one for viewing Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This is the primary advantage of the SIPS. The optical corrector is fixed at the optimal position. When you switch from a wide-field eyepiece to a high-power planetary eyepiece to view Jupiter, you only need to adjust the main focus knobs on your Feather Touch focuser. The coma correction remains perfect without any further adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SIPS compare to a standard, adjustable Tele Vue Paracorr Type 2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard Paracorr is more versatile, as it can be used in any 2\" focuser. However, the SIPS provides superior mechanical stability and ease of use. By fixing the optics, the SIPS eliminates a potential source of flexure and removes the need to constantly re-tune the corrector's position, saving you time and ensuring optimal performance every session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I collimate my telescope with the SIPS installed?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SIPS is designed to allow for easy collimation. The Tele Vue Paracorr Type 2 lens group can be removed from the main housing, giving you unobstructed access to your primary mirror for precise collimation adjustments. Once collimation is complete, you simply reinstall the lens group.\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\u003eComa Corrector Optics\u003c\/td\u003e\n\u003ctd\u003eTele Vue Paracorr Type 2, fixed at the optimum distance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Focuser\u003c\/td\u003e\n\u003ctd\u003e2\" Feather Touch with 1.5\" draw tube travel\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starlight_Instruments_SIPS_Installation_Manual.pdf?v=1775616275\" 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\/starlight-instruments-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarlight Instruments 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\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":"starlight-instruments-sips-coma-corrector-w-ftf2015bcr-lightweight-focuser","title":"Starlight Instruments SIPS Coma Corrector w\/FTF2015BCR Lightweight Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIntegrates a Tele Vue Paracorr Type 2 into a Feather Touch Focuser\u003c\/li\u003e\n\u003cli\u003eFixed optical spacing eliminates adjustments and flexure\u003c\/li\u003e\n\u003cli\u003eDesigned for fast Newtonian reflectors\u003c\/li\u003e\n\u003cli\u003eIncludes a 2-inch Feather Touch FTF2015BCR Lightweight Focuser\u003c\/li\u003e\n\u003cli\u003eAvailable in multiple anodized housing colors\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\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\u003eStarlight Instruments SIPS Coma Corrector w\/FTF2015BCR Lightweight Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Starlight Instruments SIPS (Starlight Integrated Paracorr System) permanently combines a Tele Vue Paracorr Type 2 with a Feather Touch FTF2015BCR 2-inch focuser into a single, rigidly optimized unit. By fixing the corrector at the ideal optical distance, this system eliminates the flexure, setup time, and adjustment errors common with separate components, ensuring every eyepiece reaches focus with a perfectly flat field across your entire 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\u003eThe SIPS Advantage: A Single, Optimized Optical Assembly\u003c\/h3\u003e\n\u003cp\u003eFor observers with fast Newtonian telescopes, achieving perfect coma correction typically involves adjusting a tunable-top corrector for every eyepiece change. The SIPS eliminates this entirely. The Paracorr Type 2 optics are fixed within the focuser drawtube at the precise distance required for optimal performance, turning a multi-step process into a simple focusing adjustment.\u003c\/p\u003e\n\u003cp\u003eThis integrated design is inherently more rigid than a corrector inserted into a standard focuser. It greatly reduces potential flexure, especially with heavy eyepieces or an imaging camera, which translates to sharper stars edge-to-edge. You spend less time checking settings in the dark and more time observing.\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\u003eTele Vue Paracorr Type 2 Optics: Correcting Coma in Fast Newtonians\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the SIPS are the world-class optics of the Tele Vue Paracorr Type 2. This corrector is the industry benchmark for taming the distracting, comet-shaped stars (coma) that are unavoidable in fast parabolic mirrors. The Type 2 design offers improved performance over the original, delivering sharper stars across a wider, flatter field, especially in scopes faster than f\/4.\u003c\/p\u003e\n\u003cp\u003eBy integrating these specific optics, Starlight Instruments ensures that your fast Dobsonian or imaging Newtonian performs at its full potential. The result is a view that feels more like an apochromatic refractor, with pinpoint stars from the center to the very edge of the field stop.\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\u003eFeather Touch FTF2015BCR: The 2-inch Crayford Foundation\u003c\/h3\u003e\n\u003cp\u003eThe mechanical half of the SIPS is the Feather Touch FTF2015BCR, a 2-inch lightweight Crayford focuser renowned for its precision. Its ultra-smooth dual-speed mechanism provides the fine control needed for critical focusing, both visually and for imaging. The focuser's hardened stainless steel raceways and ball bearings ensure zero image shift and long-term durability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Speed Focusing:\u003c\/strong\u003e A 10:1 reduction ratio on the fine focus knob allows for precise, repeatable adjustments without vibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass Compression Ring:\u003c\/strong\u003e Securely holds your 2-inch eyepieces and accessories without marring their barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Baffling:\u003c\/strong\u003e Minimizes stray light for improved contrast, ensuring the only light reaching your eye is from the target object.\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\u003eSIPS vs. A 2-Piece Alternative: Why Integration Matters\u003c\/h3\u003e\n\u003cp\u003eWhile a separate focuser and tunable-top Paracorr offer more flexibility, the SIPS offers superior convenience and rigidity for dedicated Newtonian users. The primary trade-off is that the SIPS is a dedicated unit; the corrector is not designed to be removed.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard System Advantage:\u003c\/strong\u003e A standalone Paracorr can be removed, allowing the focuser to be used on a different type of telescope, like a refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSIPS Advantage:\u003c\/strong\u003e Once installed and collimated, the SIPS requires no further optical adjustment. There are no locking screws to forget or misalign in the dark, and the fixed-spacing design guarantees optimal correction and rigidity every time you observe.\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 benefit of the Starlight Instruments SIPS over a separate focuser and Paracorr?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main benefit is simplicity and rigidity. The \u003cstrong\u003eSIPS permanently fixes the Tele Vue Paracorr Type 2\u003c\/strong\u003e at the perfect distance, eliminating the need to adjust it when you change eyepieces. This \"set-and-forget\" design saves valuable observing time and reduces potential optical misalignment and flexure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to adjust the SIPS when I switch from a 2\" eyepiece to a 1.25\" eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The SIPS is designed to be parfocal, meaning all your eyepieces, regardless of barrel size, should come to focus at nearly the same point. Once installed, the only adjustment you ever need to make is the main focus knob on the Feather Touch focuser. This is a key advantage over standard tunable-top coma correctors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope is the SIPS FTF2015BCR designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SIPS is specifically designed for \u003cstrong\u003efast Newtonian reflectors\u003c\/strong\u003e, typically those with focal ratios of f\/5 or faster. These telescopes suffer from significant coma away from the center of the field, which the integrated Paracorr Type 2 is designed to correct, producing sharp, pinpoint stars across the entire view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I remove the Paracorr Type 2 optics from the SIPS focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the SIPS is a permanently integrated system. The Paracorr optics are fixed inside the focuser's drawtube and are not designed to be removed by the user. This is fundamental to its design, ensuring perfect spacing and rigidity at all times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Feather Touch FTF2015BCR focuser in the SIPS handle a heavy eyepiece like a Tele Vue Ethos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Feather Touch FTF2015BCR is a robust Crayford focuser capable of handling heavy loads. It features an adjustable tension\/brake system that allows you to increase the friction on the drawtube, preventing it from slipping even when the telescope is pointed at the zenith with a heavy eyepiece or a small imaging camera installed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Starlight Instruments SIPS compatible with binoviewers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing binoviewers with the SIPS can be challenging. Binoviewers typically require significant in-focus travel, and since the SIPS has fixed optics, it may not have enough travel to reach focus without a dedicated Optical Corrector System (OCS). It is best to consult with Starlight Instruments or your dealer to confirm compatibility with your specific binoviewer model.\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\u003eHousing Color\u003c\/td\u003e\n\u003ctd\u003eBlack-Standard, Copper, Gold, Red, Silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComa Corrector\u003c\/td\u003e\n\u003ctd\u003eTele Vue Paracorr Type 2, fixed at the optimum distance\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starlight_Instruments_SIPS_Installation_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\/starlight-instruments-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarlight Instruments 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starlight Instruments","offers":[{"title":"Default Title","offer_id":44967287554333,"sku":"SI-SIPS-KIT-LW","price":1918.0,"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-FTF2015BCR-Lightweight-Focuser--SI-SIPS-KIT-LW-1__15820.1596314018.1280.1280.jpg?v=1684339994"},{"product_id":"starlight-instruments-sips-coma-corrector-w-ftf2015bcr-focuser","title":"Starlight Instruments SIPS Coma Corrector w\/FTF2015BCR Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIntegrates a Tele Vue Paracorr Type 2 Coma Corrector\u003c\/li\u003e\n\u003cli\u003eIncludes a Starlight Instruments FTF2015BCR 2-inch Focuser\u003c\/li\u003e\n\u003cli\u003eFixed optical spacing eliminates the need for user adjustments\u003c\/li\u003e\n\u003cli\u003eReduces system flexure for sharper imaging results\u003c\/li\u003e\n\u003cli\u003eDesigned for fast Newtonian and Dobsonian 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\u003eStarlight Instruments SIPS Coma Corrector w\/FTF2015BCR Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Starlight Instruments SIPS (Starlight Integrated Paracorr System) permanently unites a Tele Vue Paracorr Type 2 corrector with a precision Feather Touch FTF2015BCR focuser. This integrated design locks the corrector at the optimal optical distance, creating a single, rigid unit that eliminates the primary source of flexure and adjustment error found in conventional setups. The FTF2015BCR is a 2.0-inch format Crayford focuser with 1.5 inches of precise drawtube travel, ensuring that every eyepiece and camera reaches perfect focus without compromising the coma 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\u003eThe SIPS Concept: A Permanently Optimized Paracorr Type 2\u003c\/h3\u003e\n\u003cp\u003eThe core advantage of the SIPS is its \"set-and-forget\" design. By integrating the Tele Vue Paracorr Type 2 directly into the focuser body, Starlight Instruments has removed all variables associated with spacing and alignment. This means you never have to adjust the corrector's position when changing eyepieces, saving valuable observing time and eliminating a common source of frustration under dark skies.\u003c\/p\u003e\n\u003cp\u003eThis single-unit construction is inherently more rigid than a separate focuser and coma corrector assembly. For astrophotographers, this increased rigidity translates directly to sharper stars, as it minimizes the potential for tilt and flexure induced by heavy cameras or long exposures.\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\u003eTele Vue Paracorr Type 2 Optics: Pinpoint Stars to the Edge\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the SIPS are the world-class optics of the Tele Vue Paracorr Type 2. This corrector is the industry benchmark for eliminating coma, the optical aberration in fast Newtonian telescopes that renders stars near the edge of the field as distracting comet-like shapes. The Paracorr sharpens the entire field of view, delivering pinpoint stars from center to edge.\u003c\/p\u003e\n\u003cp\u003eBy fixing these optics inside the focuser, the SIPS guarantees that the Paracorr is always performing at its peak design specification. This makes it the ultimate solution for owners of fast Dobsonian and Newtonian astrographs who demand the highest level of optical correction for both visual observation and 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\u003eFeather Touch FTF2015BCR: 1.5 Inches of Precision Focus Travel\u003c\/h3\u003e\n\u003cp\u003eThe mechanical half of the SIPS is the legendary Feather Touch FTF2015BCR focuser. This 2.0-inch Crayford-style focuser provides 1.5 inches of exceptionally smooth drawtube travel, controlled by a dual-speed 10:1 fine focus mechanism. This level of precision is critical for achieving sharp focus, especially at high magnifications or with the demanding tolerances of modern imaging sensors.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrayford Design:\u003c\/strong\u003e The drawtube rides on hardened stainless steel raceways and bearings, ensuring zero image shift during focusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass Compression Ring:\u003c\/strong\u003e A non-marring brass ring secures your 2-inch eyepieces and accessories without scratching their barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Baffling:\u003c\/strong\u003e Glare-resistant internal surfaces maximize contrast by suppressing stray light.\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\u003eSIPS vs. Separate Components: Eliminating 1 Source of Flexure\u003c\/h3\u003e\n\u003cp\u003eWhile purchasing a Feather Touch focuser and a Paracorr separately is an option, the SIPS offers a distinct engineering advantage. A conventional setup introduces a mechanical junction between the focuser's 2-inch drawtube and the body of the Paracorr. This junction is a potential source of flexure and tilt, especially under the load of an eyepiece or camera.\u003c\/p\u003e\n\u003cp\u003eThe SIPS eliminates this junction entirely. The Paracorr optics are housed within the focuser's main body, creating one solid, continuous optical and mechanical train. This results in a demonstrably more rigid system that maintains better collimation and delivers consistently sharper images across the entire field.\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 advantage of the Starlight Instruments SIPS over a separate Paracorr?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main advantage is \u003cstrong\u003epermanent, optimal spacing and increased rigidity.\u003c\/strong\u003e The SIPS integrates the Tele Vue Paracorr Type 2 optics directly into the focuser body, eliminating the need to ever adjust the corrector's position. This single-unit design also removes a mechanical junction, significantly reducing potential flexure and tilt for sharper stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the FTF2015BCR focuser in the SIPS without the Paracorr optics?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the SIPS is a dedicated, integrated system. The optical and mechanical components are designed to work together as a single unit. While the lens group can be removed for cleaning or to aid in telescope collimation, the focuser is not intended to be used without the corrector optics in place for regular observing or imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Starlight SIPS work with any 1.25\" or 2\" eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Once installed on your Newtonian telescope, you use the SIPS just like a standard focuser. It accepts 2-inch eyepieces directly, and you can use a standard 2-to-1.25-inch adapter for smaller eyepieces. You simply rack the focuser in or out to achieve focus, with the coma correction already optimized for any eyepiece you choose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Starlight SIPS compatible with imaging cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The SIPS is an excellent choice for astrophotography with fast Newtonians. Its high rigidity minimizes camera tilt, and the fixed Paracorr ensures a flat, coma-free field that is critical for imaging sensors. You would attach your camera with a standard 2-inch nosepiece, just as you would with a regular focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Starlight SIPS improve views of the Andromeda Galaxy (M31) in a 12\" f\/4 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a fast f\/4 Dobsonian, stars at the edge of the field of view suffer from significant coma, making them appear as small seagulls or comets. When framing a large object like the Andromeda Galaxy (M31), this aberration is very noticeable. The SIPS corrects this coma, ensuring that the stars across the entire galaxy, from the core to the outer dust lanes, are rendered as sharp, round points, providing a much more satisfying and detailed wide-field view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to change any settings on the SIPS when switching eyepieces on my f\/5 Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, and that is its primary benefit. The Paracorr Type 2 optics are fixed at the optimal distance inside the focuser. When you switch from a low-power eyepiece to a high-power one, the only thing you need to do is refocus using the Feather Touch focuser's knobs. There are no other adjustments to make to the SIPS itself.\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\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eStarlight Instruments Feather Touch FTF2015BCR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComa Corrector\u003c\/td\u003e\n\u003ctd\u003eTele Vue Paracorr Type 2, fixed at the optimum distance\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\"\u003eStarlight Integrated Paracorr System (SIPS) w\/ FTF2015BCR Focuser\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\/Starlight_Instruments_SIPS_Installation_Manual.pdf?v=1775616275\" 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\/starlight-instruments-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarlight Instruments 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starlight Instruments","offers":[{"title":"Default Title","offer_id":44967287685405,"sku":"SI-SIPS-KIT","price":1848.0,"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-FTF2015BCR-Focuser-SI-SIPS-KIT-1__46971.1596314018.1280.1280.jpg?v=1684339996"},{"product_id":"baader-c-mount-canon-eos","title":"Baader C-Mount Canon EOS","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdapts Canon EOS (EF\/EF-S) mount lenses to C-mount camera bodies\u003c\/li\u003e\n\u003cli\u003eEnables wide-field imaging with photographic lenses\u003c\/li\u003e\n\u003cli\u003eAll-metal construction for secure connection\u003c\/li\u003e\n\u003cli\u003eMechanical adapter; no electronic lens control\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 C-Mount to Canon EOS Adapter\u003c\/h2\u003e\n      \u003cp\u003eThe Baader C-Mount to Canon EOS adapter provides a simple, robust mechanical bridge between two distinct optical standards. It allows you to attach the extensive range of high-quality Canon EOS (EF and EF-S) photographic lenses to any camera equipped with a standard female C-mount thread. This opens up new possibilities for wide-field imaging with specialized astronomical, industrial, or scientific cameras previously limited to smaller, dedicated C-mount lenses.\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\u003eConnecting Canon EOS Lenses to C-Mount Cameras\u003c\/h3\u003e\n      \u003cp\u003eThis adapter is engineered for one core purpose: to leverage the optical excellence of Canon's photographic lenses for applications requiring a C-mount camera. By mounting a fast telephoto or wide-angle lens, you can transform a guide camera or planetary imager into a capable tool for capturing meteor showers, wide star fields, or all-sky views.\u003c\/p\u003e\n      \u003cp\u003eIt is critical to understand that this is a purely mechanical adapter. It does not pass any electronic signals between the lens and the camera body. This presents a significant trade-off you must plan for.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eManual Focus Only:\u003c\/strong\u003e You must use the lens's manual focus ring to achieve a sharp image. Autofocus is not supported.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNo Aperture Control:\u003c\/strong\u003e Modern Canon lenses that lack a physical aperture ring will be fixed at their widest aperture. This is ideal for low-light work but offers no ability to stop down the lens to improve sharpness or increase depth of field.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSecure Fit:\u003c\/strong\u003e The all-metal construction ensures a rigid, flex-free connection, maintaining proper alignment between the lens and the camera sensor.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\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 primary function of the Baader C-Mount to Canon EOS adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader C-Mount to Canon EOS adapter's primary function is to physically connect a lens with a \u003cstrong\u003eCanon EOS bayonet mount\u003c\/strong\u003e to a camera body that uses a \u003cstrong\u003eC-mount thread\u003c\/strong\u003e. This allows you to use high-quality DSLR and mirrorless camera lenses on specialized astronomy or industrial cameras.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I control the aperture of my Canon EF lens with this Baader adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e This is a purely mechanical adapter with no electronic contacts. It cannot communicate with the lens to control aperture or autofocus. A Canon EOS lens without a manual aperture ring will remain fixed at its widest aperture setting when used with this adapter.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich types of cameras are compatible with the Baader C-Mount to Canon EOS adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAny camera with a standard female C-mount thread is compatible. This includes many popular astronomical guide cameras, planetary imagers, and various scientific and industrial video cameras. It is not designed to attach C-mount lenses to a Canon EOS camera body.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Baader C-Mount adapter for imaging the Perseid meteor shower?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor an event like the Perseids, you would attach a fast, wide-angle Canon EF lens (e.g., a 16mm or 24mm) to the Baader adapter and connect it to a sensitive C-mount astronomy camera. The wide field of view allows you to capture a large area of the sky, increasing your chances of catching meteors, while the lens's wide-open aperture gathers the maximum amount of light during short exposures.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader C-Mount adapter with a Canon telephoto lens to guide my main telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is an excellent application. By mounting a Canon telephoto lens (e.g., 200mm or 300mm) onto a C-mount guide camera, you create a high-resolution, independent guidescope. This setup is often lighter and more optically refined than many dedicated guidescopes, potentially leading to more accurate guiding corrections.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill using the Baader C-Mount to Canon EOS adapter cause vignetting?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eVignetting depends on the lens's image circle relative to your camera's sensor size. Most Canon EF lenses are designed to cover a full-frame (36x24mm) sensor, which is much larger than the sensors in typical C-mount cameras. Therefore, it is highly unlikely that the lens itself will cause vignetting on a smaller C-mount sensor.\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\u003c!-- No specifications provided --\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.08\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Adaptable\u003c\/td\u003e\n\u003ctd\u003eC-Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eCamera Adapter, Expanding Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e26\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsage\u003c\/td\u003e\n\u003ctd\u003eto connect DSLR camera lenses to video cameras or DMK video modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003e1\" Thread (C-Mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdaptable to\u003c\/td\u003e\n\u003ctd\u003eCanon EOS lenses\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!-- No items listed in the box --\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c!-- No manual or software available --\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Digiscoping_Camera_Adaptations_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 Digiscoping Camera Adaptations Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\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":44967301775645,"sku":"BAA-2958525","price":124.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-C-Mount-Canon-EOS-1__92654.1597110561.1280.1280.jpg?v=1684340283"},{"product_id":"baader-c-mount-nikon","title":"Baader C-Mount Nikon","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Nikon F-mount lenses to C-mount cameras\u003c\/li\u003e\n\u003cli\u003eEnables use of high-quality photographic lenses for astronomy\u003c\/li\u003e\n\u003cli\u003eIdeal for all-sky, meteor, and video astronomy applications\u003c\/li\u003e\n\u003cli\u003ePrecision-machined for a secure, light-tight 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 C-Mount Nikon Adapter\u003c\/h2\u003e\n      \u003cp\u003eThe Baader C-Mount Nikon Adapter provides a robust, secure mechanical link between your Nikon F-mount photographic lenses and any astronomy camera equipped with a standard C-mount thread. This simple but essential adapter opens up new imaging possibilities by allowing you to repurpose high-quality camera lenses for specialized astronomical applications like meteor monitoring, all-sky imaging, or wide-field video astronomy.\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\u003eConnect Nikon F-Mount Lenses to C-Mount Cameras\u003c\/h3\u003e\n      \u003cp\u003eThis adapter is engineered to bridge two distinct optical standards: the bayonet F-mount of Nikon SLR\/DSLR lenses and the threaded C-mount common on guide cameras, planetary imagers, and industrial video cameras. By connecting the two, you can take advantage of the fast focal ratios and wide fields of view offered by photographic lenses, pairing them with the high sensitivity and specialized software support of modern astronomy cameras.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWide-Field Imaging:\u003c\/strong\u003e Use your favorite wide-angle or standard Nikon lenses to capture vast swaths of the night sky, perfect for creating time-lapses of the Milky Way or monitoring for meteor showers.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eVideo Astronomy:\u003c\/strong\u003e Pair a fast lens (e.g., 50mm f\/1.8) with a sensitive C-mount camera for near-real-time views of bright deep-sky objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBuild Quality:\u003c\/strong\u003e The adapter is machined from metal for a rigid, non-flexing connection that maintains optical alignment and prevents stray light from entering the system.\u003c\/li\u003e\n      \u003c\/ul\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\"\u003eWhat is the primary function of the Baader C-Mount Nikon adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Baader C-Mount Nikon adapter allows you to attach any lens with a standard \u003cstrong\u003eNikon F-mount\u003c\/strong\u003e to a camera that has a \u003cstrong\u003eC-mount\u003c\/strong\u003e threaded interface. This lets you use photographic lenses for astronomical imaging.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich cameras are compatible with the Baader C-Mount Nikon adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter is compatible with any camera that uses a standard C-mount thread for its primary connection. This includes many popular guide cameras, some planetary cameras, and various industrial or security cameras often used for all-sky or meteor observation systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader C-Mount Nikon adapter to attach my Nikkor 50mm f\/1.8 lens to a ZWO ASI120MM Mini guide camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, absolutely. The ZWO ASI120MM Mini camera features a C-mount, and the Nikkor 50mm lens uses the Nikon F-mount. This adapter is designed for exactly this type of combination, turning your guide camera and lens into a powerful, wide-field imaging system.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Baader C-Mount Nikon adapter have any glass or optics inside it?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this is a purely mechanical adapter. It contains no optical elements. It serves only to physically connect the lens to the camera body at the correct distance to achieve focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Baader C-Mount Nikon adapter for a meteor camera setup?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor a meteor camera, you would typically pair a fast, wide-angle Nikon lens (e.g., a 14mm or 24mm) with a sensitive C-mount video camera using this adapter. The entire assembly would then be placed in a weatherproof housing and aimed at the sky to record continuously, capturing any meteors that pass through the field of view.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill I be able to control the aperture of my Nikon lens with this adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter provides a mechanical connection only. It does not have electronic contacts. You will only be able to use Nikon lenses that feature a \u003cstrong\u003emanual aperture ring\u003c\/strong\u003e to control the f-stop. Modern \"G-type\" lenses without an aperture ring will be fixed at their smallest aperture and are not ideal for use with this adapter.\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\u003e0.08\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Adaptable\u003c\/td\u003e\n\u003ctd\u003eC-Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eCamera Adapter, Expanding Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsage\u003c\/td\u003e\n\u003ctd\u003eto connect DSLR camera lenses to video cameras or DMK video modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003e1\" Thread (C-Mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdaptable to\u003c\/td\u003e\n\u003ctd\u003eNikon lenses\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":44967301841181,"sku":"BAA-2958535","price":107.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-C-Mount-Nikon-1__71990.1597110561.1280.1280.jpg?v=1684340284"},{"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-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":"zwo-1-3-2-1mm-150-lens","title":"ZWO 2.1mm 150° All-Sky Lens - For 1\/3\" Sensors","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2.1mm Focal Length\u003c\/li\u003e\n\u003cli\u003e150° Field of View\u003c\/li\u003e\n\u003cli\u003eOptimized for 1\/3\" Format Sensors\u003c\/li\u003e\n\u003cli\u003eFunctions as an All-Sky Camera Lens\u003c\/li\u003e\n\u003cli\u003eStandard CS-Mount 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\u003eZWO 2.1mm 150° All-Sky Lens - For 1\/3\" Sensors\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 2.1mm CS-mount lens transforms your planetary camera into a dedicated all-sky monitoring tool, capturing a vast 150° field of view in a single frame. This lens is specifically designed for ZWO cameras equipped with a 1\/3\" sensor, such as the ASI120 or ASI224MC, providing edge-to-edge coverage for meteor detection and weather surveillance.\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\u003eCapture a 150° Horizon-to-Horizon View\u003c\/h3\u003e\n\u003cp\u003eWith a short 2.1mm focal length, this lens achieves an extremely wide 150° field of view. This allows you to capture the majority of the night sky at once, making it the ideal choice for recording meteor showers, tracking satellite passes, or monitoring cloud cover throughout the night without a tracking mount. The sky becomes a dynamic canvas rather than a static target.\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 1\/3\" ZWO Guide \u0026amp; Planetary Cameras\u003c\/h3\u003e\n\u003cp\u003eThis lens is engineered to perfectly match the image circle of 1\/3\" format sensors. This ensures the entire sensor is illuminated without significant vignetting or wasted field, a common issue when pairing lenses with mismatched sensors. It is a direct-fit solution for popular models like the ZWO ASI120MM-S, ASI120MC-S, and ASI224MC, turning them into powerful scientific and surveillance instruments.\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\u003eCS-Mount Standard and Adapter Requirements\u003c\/h3\u003e\n\u003cp\u003eThe lens uses a standard CS-mount thread for direct connection to compatible camera bodies. Note that a C\/CS mount adapter is not included with this lens. To achieve proper focus, you will need the CS-mount adapter that was originally supplied with your ZWO camera, or purchase one separately. A CS-mount lens cannot reach focus on a camera with C-mount threads, since an adapter ring can only add distance, not remove it.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Fit:\u003c\/strong\u003e Screws directly into the CS-mount threads found on many ZWO cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for C-Mount Cameras:\u003c\/strong\u003e A CS-mount lens will not reach focus on a camera body with C-mount threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus Mechanism:\u003c\/strong\u003e Manual focus and aperture control allow you to set and lock the lens for consistent nightly operation.\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 kind of events can I capture with the ZWO 2.1mm 150° lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ultra-wide 150° field of view is ideal for capturing large-scale celestial phenomena. You can record entire meteor showers like the Perseids or Geminids, track the paths of bright fireballs, monitor for transient events like aurora, or simply create time-lapses of the Milky Way rising and setting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich ZWO cameras work best with this 2.1mm lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis lens is designed for cameras with a \u003cstrong\u003e1\/3\" sensor\u003c\/strong\u003e. The most common and recommended pairings are the ZWO ASI120 series (both monochrome and color) and the ASI224MC. Using it on a larger sensor will result in heavy vignetting and an incomplete image circle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the ZWO 2.1mm all-sky lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFocus is achieved manually by turning the lens barrel. For astronomical use, it's best to focus at night on a bright star. Once sharp focus is achieved across the field, you can use the locking screw on the lens to fix its position for long-term, unattended operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a tracking mount to use the ZWO 2.1mm lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, a tracking mount is not necessary. In fact, this lens is designed for static use on a fixed tripod. The 150° field of view is so wide that stars will take hours to drift across the frame, which is perfect for creating all-sky time-lapses and monitoring the sky from a fixed position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need any filters with the ZWO 2.1mm lens for meteor observation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most all-sky applications like meteor showers (e.g., the Orionids), you do not need any filters. You want to capture as much light as possible. If you are in a light-polluted area, a simple IR-cut filter might help improve contrast slightly, especially with a color camera like the ASI224MC, but it is not a requirement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapter do I need to connect the ZWO 2.1mm lens to my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a CS-mount lens. It will screw directly into a camera that has female CS-mount threads. It will not reach focus on a camera with C-mount threads, because a C-to-CS adapter ring only adds 5mm of spacing and cannot shorten the flange distance. Most ZWO cameras that this lens is designed for, like the ASI120, come with the necessary adapters, but the lens itself does not include one.\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-LENS-2.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField of View\u003c\/td\u003e\n\u003ctd\u003e150°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesigned Sensor Size\u003c\/td\u003e\n\u003ctd\u003e1\/3\" Format\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Type\u003c\/td\u003e\n\u003ctd\u003eCS-Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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\"\u003e150º CS Lens for ASI 1\/3\" Sensors\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.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\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967384219933,"sku":"ZWO-LENS-2.1","price":31.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-1-3-inch-2-1mm-150-degree-lens-1__84146.1596910045.1280.1280.jpg?v=1684341533"},{"product_id":"zwo-2-5mm-170-lens","title":"ZWO 2.5mm 170° All-Sky Lens - For 1\/2\" Sensors","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003e2.5mm Focal Length\u003c\/li\u003e\n  \u003cli\u003e170° All-Sky Field of View\u003c\/li\u003e\n  \u003cli\u003eDesigned for 1\/2\" Format Sensors\u003c\/li\u003e\n  \u003cli\u003eCS-Mount 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\u003eZWO 2.5mm 170° All-Sky Lens - For 1\/2\" Sensors\u003c\/h2\u003e\n          \u003cp\u003eThe ZWO 2.5mm 170° All-Sky CS Lens transforms your astronomy camera into a horizon-to-horizon sentinel, capturing a massive 170-degree field of view in a single frame. This 2.5mm focal length lens is engineered specifically for cameras with a 1\/2\" sensor, such as the ZWO ASI178 and ASI185 series, to monitor meteor showers, track atmospheric phenomena, or conduct sky surveillance.\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 170° All-Sky Perspective\u003c\/h3\u003e\n          \u003cp\u003eThe primary function of this 2.5mm lens is to deliver an immense 170° field of view. This expansive coverage allows you to capture the entire visible sky dome at once, making it the ideal tool for time-lapses of the Milky Way's transit, recording meteor showers like the Perseids or Geminids, or monitoring for transient events like fireballs and satellite flares.\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 1\/2\" Format Sensors\u003c\/h3\u003e\n          \u003cp\u003eThis lens is designed to match the imaging circle of 1\/2\" format sensors. When paired with cameras like the ZWO ASI178MM, ASI178MC, or ASI185MC, it produces a complete, circular all-sky image with minimal vignetting at the sensor's edges. This ensures that the data you collect from horizon to horizon is usable and consistent.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eDirect Compatibility:\u003c\/strong\u003e Threads directly onto the CS-mount of compatible ZWO cameras.\n            \u003c\/li\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eSensor Match:\u003c\/strong\u003e The 2.5mm focal length is calculated to project the full 170° field onto the smaller sensor format, preventing wasted field of view or excessive black borders.\n            \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\u003eCS-Mount Connection and Considerations\u003c\/h3\u003e\n          \u003cp\u003eThe lens features a standard CS-mount thread for direct attachment to many planetary and guide cameras. However, it's critical to note that a CS-mount lens will not reach focus on a camera with a C-mount thread. The CS flange distance is shorter than the C-mount distance, and an adapter ring can only add spacing, not remove it. If your ZWO camera needs a CS-mount adapter, it is not included with the lens.\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 cameras are compatible with the ZWO 2.5mm All-Sky Lens?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThis 2.5mm lens is specifically designed for cameras with a \u003cstrong\u003e1\/2\" sensor format\u003c\/strong\u003e and a CS-mount. It is an excellent match for models like the ZWO ASI178MM, ASI178MC, and ASI185MC. It will also work with the ASI120 series.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need any adapters to use the ZWO 2.5mm lens?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eIt depends on your camera's mount. The lens has a \u003cstrong\u003eCS-mount thread\u003c\/strong\u003e. If your camera (like the ASI178) has a native CS-mount, it will attach directly. If your camera uses a C-mount, this lens will not reach focus, because a C-to-CS adapter ring only adds spacing. No adapter is included.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO 2.5mm lens good for capturing the Geminids meteor shower?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eYes, absolutely. Its 170° field of view makes it perfect for meteor showers. You can point the camera straight up and capture meteors appearing anywhere in the sky without having to aim, making it an ideal setup for automated meteor detection with dedicated meteor detection software.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2.5mm lens work with a larger sensor, like an APS-C camera?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eNo, this lens is not recommended for sensors larger than 1\/2\". The image circle it projects is too small for larger sensors and will result in severe vignetting, showing only a small illuminated circle in the center of a large black frame.\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 ZWO 170° All-Sky Lens?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThis lens does not have a standard filter thread on the front or rear element. It is designed for wide-field, unfiltered imaging of the night sky. Attempting to place a filter in the optical path would require a custom solution.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the ZWO 2.5mm lens?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe lens has a manual focus ring. You will need to adjust it by hand to achieve sharp stars. It's best to perform this at night, viewing a live feed from the camera on a laptop screen and adjusting the focus until stars appear as tight points of light.\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-LENS-2.5\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eFocal Length\u003c\/td\u003e\n          \u003ctd\u003e2.5mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eField of View\u003c\/td\u003e\n          \u003ctd\u003e170°\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMount\u003c\/td\u003e\n          \u003ctd\u003eCS-Mount\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eRecommended Sensor Format\u003c\/td\u003e\n          \u003ctd\u003e1\/2\"\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eWarranty\u003c\/td\u003e\n          \u003ctd\u003e2 Years\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\"\u003e170º 2.5mm CS Lens\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        \u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\n          \u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\n            \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\n          \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\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":44967385956637,"sku":"ZWO-LENS-2-5","price":31.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-2-5mm-170-degree-lens-1__46794.1596910046.1280.1280.jpg?v=1684341752"},{"product_id":"zwo-cs-lens-2-8mm-12mm-f1-4","title":"ZWO CS Lens 2.8mm-12mm F1.4","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2.8mm to 12mm Zoom Focal Length\u003c\/li\u003e\n\u003cli\u003eFast f\/1.4 Aperture\u003c\/li\u003e\n\u003cli\u003e~100° Wide Field of View\u003c\/li\u003e\n\u003cli\u003eDesigned for 1\/3\" Format Sensors\u003c\/li\u003e\n\u003cli\u003eStandard CS-Mount 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\u003eZWO 2.8mm - 12mm f\/1.4 CS Lens\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 2.8mm - 12mm f\/1.4 CS Lens transforms your small-format planetary camera into a dedicated all-sky instrument. Its variable 2.8mm to 12mm focal length provides a field of view up to approximately 100 degrees, while the fast f\/1.4 aperture gathers enough light for capturing transient events like meteors. This lens is specifically engineered for cameras with 1\/3\" sensors, such as the ZWO ASI120 series.\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\u003e2.8mm to 12mm Zoom for Framing the Sky\u003c\/h3\u003e\n\u003cp\u003eThe key to this lens is its flexible 2.8mm to 12mm zoom range. At 2.8mm, you can capture an immense swath of the sky, perfect for monitoring meteor showers or imaging the entire Milky Way band. Zooming in towards 12mm allows you to frame specific large constellations or regions of interest without swapping equipment, giving you compositional control directly at the lens.\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\/1.4 Advantage for Faint, Fast Events\u003c\/h3\u003e\n\u003cp\u003eAn f\/1.4 focal ratio is exceptionally fast, maximizing light collection in short exposures. This is critical for capturing the fleeting streaks of meteors, which last only a fraction of a second. The wide aperture allows you to use higher frame rates and lower gain on your camera, resulting in cleaner, less noisy video captures of atmospheric phenomena or auroral displays.\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\u003eCS-Mount Integration for 1\/3\" Sensors\u003c\/h3\u003e\n\u003cp\u003eThis lens uses the standard CS-mount, designed to match the small chip size of 1\/3\" format guide and planetary cameras. This ensures the entire sensor is illuminated without vignetting and that the resolution is matched to the camera's capabilities. Note that to connect this lens to a standard ZWO camera with T2 threads, you will need a separate T2-CS adapter.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Compatibility:\u003c\/strong\u003e Optimally pairs with cameras like the ZWO ASI120MC\/MM.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdapter Required:\u003c\/strong\u003e A T2-CS or M42-CS adapter is necessary for connecting to most ZWO cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse Case Limitation:\u003c\/strong\u003e The small image circle is not intended for larger format deep-sky cameras, which would show severe vignetting.\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 cameras work best with the ZWO 2.8-12mm CS Lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis lens is designed for cameras with a \u003cstrong\u003e1\/3\" sensor format\u003c\/strong\u003e. The classic pairing is with the ZWO ASI120 series cameras. Using it with a camera that has a larger sensor will result in a small image circle in the center of the frame and heavy vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need an adapter to attach this ZWO lens to my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Most ZWO cameras feature a female T2 (M42x0.75) thread on the front. To attach this CS-mount lens, you will need a \u003cstrong\u003eT2-CS adapter\u003c\/strong\u003e, which is sold separately. This adapter provides the correct threading and spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow can I use the ZWO 2.8-12mm lens to capture the Perseid meteor shower?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor the Perseids, set the lens to its widest focal length (\u003cstrong\u003e2.8mm\u003c\/strong\u003e) to maximize the sky coverage. Point your camera towards a dark part of the sky about 45 degrees away from the radiant in Perseus. The fast \u003cstrong\u003ef\/1.4 aperture\u003c\/strong\u003e will allow you to capture even faint meteors using short video exposures in a program like SharpCap or FireCapture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO 2.8-12mm lens good for imaging planets or galaxies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this lens is not suitable for planetary or deep-sky imaging. Its extremely short focal length (\u003cstrong\u003e2.8mm-12mm\u003c\/strong\u003e) is designed for ultra-wide-angle views of the sky. For planets, you need the long focal length of a telescope, and for most galaxies, you need a much longer focal length instrument to resolve any detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"fisheye\" effect mean for this ZWO lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt its widest 2.8mm setting, the lens will exhibit significant barrel distortion, often called a \"fisheye\" effect. This means straight lines (like building edges) will appear curved, and constellations near the edge of the frame will look stretched. This is a normal optical characteristic of very wide-angle lenses and is necessary to achieve the ~100-degree field of view.\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 ZWO 2.8-12mm CS lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis lens does not have a standard front filter thread like a DSLR lens. It is designed for unfiltered, wide-field imaging of the night sky, such as for meteor showers or capturing the Milky Way in true color with a one-shot-color 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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-LENS-2.8-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2.8mm - 12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003ef\/1.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eCS-Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Sensor Format\u003c\/td\u003e\n\u003ctd\u003e1\/3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField of View (approx.)\u003c\/td\u003e\n\u003ctd\u003e~100°\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\"\u003e2.8mm - 12mm f\/1.4 CS Lens\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\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967433240861,"sku":"ZWO-LENS-2.8-12","price":53.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-CS-Lens-2-8mm-12mm-F1-4-1__29815.1596910053.1280.1280.jpg?v=1684341838"},{"product_id":"zwo-eos-lens-adapter-for-efw","title":"ZWO EOS Lens Adapter for EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EF lenses to ZWO Electronic Filter Wheels (EFW); EF-S lenses are not supported\u003c\/li\u003e\n\u003cli\u003eEngineered for ZWO cameras with 6.5mm back focus (e.g., ASI1600)\u003c\/li\u003e\n\u003cli\u003eAdds 17.5mm of spacing to complete the 44mm Canon EF flange distance (6.5mm + 20mm EFW + 17.5mm)\u003c\/li\u003e\n\u003cli\u003eSecond-generation design with an improved, secure locking mechanism\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 EFW-EOS Lens Adapter for 6.5mm Back Focus Cameras\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW-EOS Adapter is the essential mechanical link for attaching Canon EF lenses to a ZWO Electronic Filter Wheel (EFW) and a cooled camera with 6.5mm of back focus. This second-generation adapter features an improved locking mechanism and adds the 17.5mm of spacing needed to reach the 44mm Canon EF flange distance, enabling you to use your high-quality camera lenses for wide-field astrophotography with filters.\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\u003eCanon Lens Integration for 6.5mm ZWO Cameras\u003c\/h3\u003e\n\u003cp\u003eThis adapter solves the specific back focus challenge of using Canon EF lenses with ZWO's popular 6.5mm back focus cameras, like the ASI1600 series, and an EFW. By bridging the mechanical and spacing gap, it enables wide-field imaging with proven telephoto optics, correctly establishing the 17.5mm distance required for a sharp, flat field with a filter wheel in the optical 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\u003eGeneration II Locking Mechanism\u003c\/h3\u003e\n\u003cp\u003eAs the second-generation version, this ZWO EFW-EOS adapter has been redesigned with a more robust and secure locking mechanism. You gain a more rigid connection between your lens and filter wheel, minimizing tilt and ensuring your optical train remains perfectly collinear throughout an imaging session, even with heavier telephoto lenses.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid Connection:\u003c\/strong\u003e Reduces the potential for flexure and optical tilt compared to the first-generation model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Mounting:\u003c\/strong\u003e Confidently attach heavy lenses without worrying about slippage or unwanted rotation.\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\u003eASI1600 \u0026amp; EFW Wide-Field Imaging\u003c\/h3\u003e\n\u003cp\u003eThe primary use for this adapter is pairing a workhorse camera like the ZWO ASI1600 with a 7 or 8-position EFW and your existing Canon lenses. This combination turns your camera lens into a powerful, compact astrograph for capturing large targets like the Andromeda Galaxy (M31) or the Rho Ophiuchi cloud complex without requiring a telescope.\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 ZWO EFW-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter allows you to connect a \u003cstrong\u003eCanon EF lens\u003c\/strong\u003e (EF-S lenses are not supported) to a \u003cstrong\u003eZWO Electronic Filter Wheel (EFW)\u003c\/strong\u003e, which is then connected to a ZWO camera with \u003cstrong\u003e6.5mm of back focus\u003c\/strong\u003e. Its 17.5mm length, added to the camera's 6.5mm and the EFW's 20mm, gives the 44mm Canon EF flange distance needed for sharp focus across the entire sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use this adapter to image the North American Nebula (NGC 7000) with my Canon lens and ASI1600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAttach your Canon lens to this adapter, thread the adapter onto the front of your ZWO EFW, and then connect your ZWO ASI1600 camera to the back of the EFW. This creates a rigid, wide-field imaging rig perfect for large emission nebulae like NGC 7000, allowing you to use narrowband or LRGB filters with your camera lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO EFW-EOS adapter work with a full-frame camera like the ASI6200MC Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is specifically designed for ZWO cameras with a \u003cstrong\u003e6.5mm back focus\u003c\/strong\u003e. Cameras like the ASI6200MC Pro have a different native back focus (17.5mm) and require a different adapter solution for use with Canon lenses and a filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main improvement in this second-generation ZWO EFW-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key improvement is a redesigned, more secure \u003cstrong\u003elocking mechanism\u003c\/strong\u003e. This ensures a tighter, more rigid connection to the Canon lens, which is critical for preventing optical tilt and flexure, especially when using heavier telephoto lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I control the aperture of my Canon EF lens with this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the ZWO EFW-EOS adapter provides a purely \u003cstrong\u003emechanical connection\u003c\/strong\u003e. It does not transmit electronic signals for aperture or autofocus control. Aperture must be set on the lens itself, if the lens has a manual aperture ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this adapter to connect my Canon lens directly to a ZWO camera without a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is specifically for integrating a ZWO Electronic Filter Wheel (EFW) into the imaging train. For a direct camera-to-lens connection, you would need a different ZWO EOS-T2 adapter designed for that purpose.\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 Number\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-EOS-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eCanon EF (EF-S not supported)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eZWO EFW (Electronic Filter Wheel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Camera Back Focus\u003c\/td\u003e\n\u003ctd\u003e6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Optical Length\u003c\/td\u003e\n\u003ctd\u003e17.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFilter Wheel Adapter\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\"\u003eShort EOS Adapter for EFW (Gen II)\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.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\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967437992221,"sku":"ZWO-EFW-EOS-II","price":69.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-EOS-Lens-Adapter-for-EFW-1__74924.1596910055.1280.1280.jpg?v=1684341937"},{"product_id":"zwo-t2-to-canon-eos-ef-mount-lens-adapter","title":"ZWO T2 to Canon EOS EF-Mount Lens Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EF lenses to any ZWO camera with M42 T2-threads\u003c\/li\u003e\n\u003cli\u003eTwo-part design supports cameras with 12.5mm or 17.5mm back focus\u003c\/li\u003e\n\u003cli\u003eIncludes a 5mm T2 extender for precise spacing adjustment\u003c\/li\u003e\n\u003cli\u003eInternal threads accept standard 2\" astronomy filters\u003c\/li\u003e\n\u003cli\u003eSecond-generation design with an improved, secure lens locking mechanism\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\u003eZWO EOS-T2 II Lens Adapter for ASI Cameras\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EOS-T2 II adapter connects your Canon EF lenses to any ZWO camera, utilizing a two-part design with an included 5mm T2 extender to achieve perfect back focus for cameras requiring either 12.5mm or 17.5mm. This second-generation model features an improved locking mechanism for a rigid, flex-free connection to your M42-threaded camera body.\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 Back Focus for 12.5mm and 17.5mm ZWO Cameras\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered to work with the two primary back focus standards across the ZWO camera lineup. By adding or removing the included 5mm T2 extender, you can ensure your Canon lens reaches infinity focus with nearly any ZWO camera.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e17.5mm Back Focus (Adapter Only):\u003c\/strong\u003e Use the main adapter body without the extender for cooled ASI cameras (except the ASI6200 and ASI2400), as well as uncooled models like the ASI174, ASI294, ASI183, ASI1600, ASI533, and ASI2600.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12.5mm Back Focus (Adapter + Extender):\u003c\/strong\u003e Attach the 5mm T2 extender for smaller-format cameras, including the ASI120, ASI224, ASI290, ASI178, and ASI385.\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\u003eAccepts 2\" Filters for Lens-Based Narrowband Imaging\u003c\/h3\u003e\n\u003cp\u003eThe interior of the EOS-T2 adapter is threaded to accept standard 2\" (M48x0.75) astronomy filters. This critical feature allows you to use light pollution, LRGB, or narrowband filters directly with your high-quality camera lenses, opening up new possibilities for wide-field astrophotography from any location.\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\u003eImproved Gen II Locking Mechanism\u003c\/h3\u003e\n\u003cp\u003eAs the second generation of this adapter, the EOS-T2 II features a redesigned and more robust locking mechanism. This ensures your Canon EF lens is held securely to the camera with zero rotational play or flexure, which is critical for maintaining sharp focus and consistent flat frames throughout an imaging session, even with heavier telephoto lenses.\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 do I know if I need the 5mm extender for my ZWO camera with the EOS-T2 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe configuration depends entirely on your camera's native back focus. \u003cstrong\u003eIf you have a cooled ZWO camera (other than the ASI6200 or ASI2400) or an uncooled model like the ASI1600\/183\/294\/533\/2600, you do not need the extender.\u003c\/strong\u003e These cameras have a 17.5mm back focus. If you have a smaller guide-style or planetary camera like the ASI120\/224\/290, you must use the included 5mm extender to reach the required 12.5mm back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I control aperture or autofocus with the ZWO EOS-T2 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The ZWO EOS-T2 is a purely mechanical adapter. It does not have any electronic contacts to communicate with the Canon EF lens. You must set the aperture on the lens manually before attaching it to the adapter (if possible) or shoot wide open. Focusing must also be done manually using your imaging software's focusing aids.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work with Canon EF-S lenses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed specifically for the \u003cstrong\u003eCanon EF mount\u003c\/strong\u003e. While some EF-S lenses might physically attach, their rear element often protrudes further back, which can interfere with filters or the camera sensor window. We recommend using only EF-mount lenses to ensure compatibility and avoid potential damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install a 2\" filter with the ZWO EOS-T2 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter has female M48x0.75 threads on the inside. Simply screw your 2\" filter directly into these threads on the camera side of the adapter before attaching the adapter to your ZWO camera body. This places the filter in the optical path between the lens and the sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to image the Andromeda Galaxy (M31) with my ASI533MC Pro and a Canon 135mm lens. What configuration do I use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor your ASI533MC Pro, you will use the ZWO EOS-T2 adapter \u003cstrong\u003ewithout the 5mm extender\u003c\/strong\u003e. The ASI533MC Pro has a native 17.5mm back focus, which the main adapter body is designed for. You can thread a 2\" light pollution filter inside the adapter to help manage skyglow and improve contrast on M31.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO EOS-T2 adapter for all-sky imaging with a fisheye lens and my ASI178MC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent application. The ASI178MC has a 12.5mm back focus, so you must use the ZWO EOS-T2 adapter \u003cstrong\u003ewith the 5mm T2 extender attached\u003c\/strong\u003e. This combination will allow your Canon EF-mount fisheye lens to achieve proper infinity focus for capturing meteor showers or the entire Milky Way arch.\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-EOS-T2-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eCanon EF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mount\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 (T2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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\"\u003eEOS-T2 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\"\u003e5mm T2 Extender\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\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967438024989,"sku":"ZWO-EOS-T2-II","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-EOS-T2-Adapter-1__03240.1596910055.1280.1280.jpg?v=1684341939"},{"product_id":"zwo-t2-to-c-cs-adapter","title":"ZWO T2 To C\/CS Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects C-mount and CS-mount lenses to T2-threaded cameras\u003c\/li\u003e\n\u003cli\u003eAdds a precise 7mm to the optical path length\u003c\/li\u003e\n\u003cli\u003eStandard M42x0.75 male threads for universal camera compatibility\u003c\/li\u003e\n\u003cli\u003eAll-metal, black anodized construction minimizes reflections\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\u003eZWO T2 to C\/CS Adapter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO T2 to C\/CS Adapter connects lenses with C or CS-mount threads to any camera body using the standard M42 T2-thread. This all-metal adapter adds a fixed optical length of 7mm, establishing the correct back focus for both C-mount (17.5mm) and CS-mount (12.5mm) lens standards when paired with compatible ASI 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\u003eDual C\/CS Lens Compatibility with 7mm Optical Length\u003c\/h3\u003e\n\u003cp\u003eThis adapter provides a single, robust solution for two distinct lens standards. It presents standard male M42 (T2) threads to your camera and female C\/CS threads that accept the lens. The adapter's fixed 7mm thickness is the key dimension that correctly positions the sensor relative to the lens's focal plane.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eC-Mount Lens Back Focus:\u003c\/strong\u003e Results in a 17.5mm back focus distance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCS-Mount Lens Back Focus:\u003c\/strong\u003e Results in a 12.5mm back focus distance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Machined from black anodized aluminum to ensure a secure, non-reflective connection in 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\u003eAdapting Guide Scopes and All-Sky Lenses with M42 Threads\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the T2-CS adapter is to let you repurpose widely available and affordable C\/CS lenses for astronomical use. This is especially useful for creating compact, lightweight guide scope setups or for wide-field meteor cameras where a full telescope is unnecessary. The universal M42 T2-thread ensures it will connect to the vast majority of dedicated astronomy cameras, not just ZWO 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 is the ZWO T2-CS adapter used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO T2-CS adapter connects a C-mount or CS-mount lens (commonly used in security and machine vision) to an astronomy camera that has standard M42 T2-threads. This allows you to use compact, fast lenses for applications like autoguiding, all-sky imaging, or wide-field astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ZWO T2-CS adapter handle both C and CS lenses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter physically accepts both C and CS-mount threads. The resulting back focus distance changes depending on which type of lens you attach. With a \u003cstrong\u003eC-mount lens, the back focus is 17.5mm\u003c\/strong\u003e. With a \u003cstrong\u003eCS-mount lens, the back focus is 12.5mm\u003c\/strong\u003e. You must ensure your camera's sensor-to-flange distance is compatible with these values.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the optical path length of the ZWO T2-CS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter itself has a physical thickness, or optical path length, of exactly \u003cstrong\u003e7mm\u003c\/strong\u003e. This dimension must be included in your back focus calculations when building your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO T2-CS adapter to attach a security camera lens to my ASI120MM Mini for guiding?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot directly. The ASI120MM Mini has an 8.5mm back focus and a 1.25\" nosepiece style body rather than M42 T2 female threads, so this adapter does not thread onto it. It is intended for ASI cameras with M42 threads whose back focus suits the 17.5mm (C) or 12.5mm (CS) lens requirement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO T2-CS adapter let me connect an f\/1.4 C-mount lens to my ASI585MC for meteor imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The ZWO T2-CS adapter connects the C-mount lens to the M42 threads on the ASI585MC. The uncooled ASI585MC has a back focus of 12.5mm, so check that your total spacing matches the 17.5mm a C-mount lens requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre there any other adapters needed to use the ZWO T2-CS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a direct, one-piece adapter. One side threads into your camera's M42 T2-threads, and the other side threads onto your C or CS-mount lens. No other parts are required for the connection itself.\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-T2-CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Type (Camera Side)\u003c\/td\u003e\n\u003ctd\u003eM42 (T or T2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Type (Lens Side)\u003c\/td\u003e\n\u003ctd\u003eC or CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eZWO - 2 Years\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\"\u003eT2 to CS Adapter\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\/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":44967446708509,"sku":"ZWO-T2-CS","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-T2-To-C-CS-Adapter-1__19128.1596910061.1280.1280.jpg?v=1684342132"},{"product_id":"zwo-eos-lens-adapter-for-2-efw","title":"ZWO EOS Lens Adapter for 2\" EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EOS lenses to a ZWO 2\" Electronic Filter Wheel\u003c\/li\u003e\n\u003cli\u003eM54x0.75 male thread that threads directly into the 2\" EFW\u003c\/li\u003e\n\u003cli\u003eEnables filtered, wide-field astrophotography with DSLR lenses\u003c\/li\u003e\n\u003cli\u003eEngineered specifically for the larger 2\" ZWO EFW models\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 EOS Lens Adapter for 2\" EFW\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EOS Lens Adapter for 2\" EFW (ZWO EFW2-EOS) provides the essential link between your Canon EOS-mount lenses and a ZWO 2-inch Electronic Filter Wheel. It features a robust M54x0.75 male thread that threads directly into the larger 2\" filter wheel body, enabling you to capture wide-field celestial images through your choice of filters.\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\u003eM54x0.75 Thread for 2\" Filter Wheels\u003c\/h3\u003e\n\u003cp\u003eThis adapter is built around the M54x0.75 thread standard used on ZWO's 2\" EFW. This larger-diameter connection is critical for minimizing vignetting when pairing full-frame camera lenses with ZWO cameras that have large sensors. The secure, threaded interface ensures your imaging train remains perfectly collinear and free of light leaks throughout an 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\u003eInstallation and Compatibility with your 2\" EFW\u003c\/h3\u003e\n\u003cp\u003eProper installation requires a direct connection to the ZWO 2\" EFW. To achieve this, you must first remove the sensor tilt adapter plate that comes attached to your ZWO camera. This ensures the correct spacing and a flush fit between the filter wheel and the camera body.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired EFW:\u003c\/strong\u003e This adapter is exclusively compatible with the ZWO 2\" Electronic Filter Wheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncompatible EFWs:\u003c\/strong\u003e It is not mechanically compatible with the smaller ZWO 1.25\", 31mm, or 36mm filter wheels, which use a different thread size.\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\u003eZWO EFW2-EOS vs. ZWO-EOS-T2 Adapter\u003c\/h3\u003e\n\u003cp\u003eZWO produces two primary EOS lens adapters for its filter wheels, and choosing the correct one is critical. The key difference is the rear connection thread, which dictates which filter wheel it can attach to.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO EFW2-EOS (This Model):\u003c\/strong\u003e Features a large M54x0.75 thread designed for the 2\" EFW. This is the correct choice for larger sensors and 2\" filters to avoid clipping the light path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO-EOS-T2 Adapter:\u003c\/strong\u003e Uses a smaller M42x0.75 (T2) thread. This version is designed for the 1.25\", 31mm, and 36mm EFWs, which are typically paired with cameras that have smaller APS-C or Four Thirds sensors.\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 do I need to connect my Canon EOS lens to a ZWO 2\" EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need this specific adapter, the ZWO EOS Lens Adapter for 2\" EFW (SKU: ZWO-EFW2-EOS). It has the correct M54x0.75 thread to attach directly to the 2\" filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this ZWO EOS adapter work with my ZWO 36mm EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter is exclusively for the ZWO 2\" EFW. The ZWO 36mm, 31mm, and 1.25\" filter wheels require the ZWO-EOS-T2 adapter, which uses a smaller M42 thread.\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 ZWO camera to install the EFW2-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a minor adjustment is required. You must remove the sensor tilt adapter that comes pre-installed on the front of your ZWO cooled camera. This allows the camera to connect flush with the back of the 2\" EFW.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter to image the Orion Nebula (M42) with my ZWO ASI2600MC Pro camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This adapter is the ideal component for that setup. It allows you to connect a wide-angle Canon EOS lens to your 2\" EFW, which would house your filters (like a dual-band filter), and then thread directly to your ASI2600MC Pro (after removing its tilt plate). This creates a powerful wide-field imaging rig perfect for large targets like the Orion Nebula (M42).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this adapter use an M54x0.75 thread instead of a standard T2 thread?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe larger M54x0.75 thread is necessary to match the opening of the 2\" EFW. A smaller T2 (M42x0.75) thread would create a bottleneck in the light path, causing significant vignetting (darkened corners) on cameras with large sensors, especially when using full-frame EOS lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the warranty on the ZWO EFW2-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis ZWO adapter is covered by a 2-year manufacturer warranty, ensuring it is free from defects in materials and workmanship.\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 Number\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW2-EOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Wheel Product Type\u003c\/td\u003e\n\u003ctd\u003eFilter Wheel Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eZWO - 2 Years\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\"\u003eEOS Lens Adapter for 2\" EFW\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.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\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967453524253,"sku":"ZWO-EFW2-EOS","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-EOS-Lens-Adapter-2-EFW-1__58784.1597107773.1280.1280.jpg?v=1684342348"},{"product_id":"zwo-nikon-lens-adapter-for-efw","title":"ZWO Nikon Lens Adapter for EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Nikon F-mount lenses to ZWO Electronic Filter Wheels\u003c\/li\u003e\n\u003cli\u003eEngineered for cameras with 6.5mm back focus\u003c\/li\u003e\n\u003cli\u003eProvides 20 mm of spacing\u003c\/li\u003e\n\u003cli\u003eStandard M42x0.75 female thread for EFW attachment\u003c\/li\u003e\n\u003cli\u003eCompatible with 1.25\", 31mm, and 36mm ZWO EFW models\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 Nikon Lens Adapter for EFW\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW-Nikon Adapter connects your Nikon lenses to select ZWO filter wheels, creating a 20 mm thick, rigid connection for wide-field imaging. It is engineered specifically for ZWO cooled cameras with a 6.5 mm back focus requirement, such as the ASI1600, ASI533, ASI183, and ASI294. The adapter features a standard M42x0.75 thread for direct attachment to ZWO's 1.25\", 31mm, and 36mm electronic filter wheels.\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\u003eWide-Field Imaging with 1.25\", 31mm, and 36mm Filters\u003c\/h3\u003e\n\u003cp\u003eThis adapter unlocks the optical power of your Nikon F-mount camera lenses for serious astrophotography. By integrating a ZWO 1.25\", 31mm, or 36mm Electronic Filter Wheel (EFW), you can capture narrowband or LRGB data on sprawling targets like the North America Nebula (NGC 7000) or the Andromeda Galaxy (M31) using the same glass you trust for terrestrial photography.\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\u003ePrecision Machined for a 6.5mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe adapter's 20 mm thickness is precisely calculated to achieve correct spacing when paired with a ZWO EFW and a cooled camera that has a 6.5 mm back focus. This is a critical specification; cameras with a different back focus (such as 17.5mm) will not reach focus with this adapter. The all-metal, black-anodized construction ensures a secure, non-flexing connection between your lens and imaging train.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Cameras:\u003c\/strong\u003e Designed for ZWO models like the ASI1600, ASI183, ASI294, and ASI533, which all feature a 6.5mm back focus distance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Connection:\u003c\/strong\u003e The M42x0.75 female thread provides a direct, stable attachment to the filter wheel, preventing tilt and maintaining optical alignment.\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\"\u003eWhich cameras are compatible with the ZWO EFW-Nikon adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed exclusively for ZWO cooled cameras that have a \u003cstrong\u003e6.5mm back focus\u003c\/strong\u003e. This includes popular models such as the ASI1600 Pro, ASI183 Pro, ASI294 Pro, and ASI533 Pro. It is not compatible with cameras requiring 17.5mm of back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich ZWO filter wheels work with this Nikon lens adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO EFW-Nikon adapter connects via an M42x0.75 thread to ZWO's electronic filter wheels that accept \u003cstrong\u003e1.25\", 31mm, and 36mm filters\u003c\/strong\u003e. It is not designed for larger 2\" filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 6.5mm back focus requirement so important for the ZWO EFW-Nikon adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCamera lenses, unlike telescopes, have a fixed and much shorter back focus distance. This adapter's 20 mm thickness is precisely machined to place the camera sensor at the exact focal plane of the Nikon lens when used with a ZWO EFW and a camera with 6.5mm of back focus. Using a camera with a different back focus will result in an inability to achieve a sharp image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO EFW-Nikon adapter without a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is specifically designed to connect a Nikon lens to a ZWO Electronic Filter Wheel (EFW). It does not provide a direct camera-to-lens connection and relies on the filter wheel body for both threading and correct spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use this Nikon adapter to image the Andromeda Galaxy (M31) with my ASI1600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a large target like the Andromeda Galaxy (M31), you could use a 200mm Nikon lens. Attach the lens to the ZWO EFW-Nikon adapter, connect the adapter to your ZWO EFW loaded with LRGB filters, and then thread the EFW onto your ASI1600. This setup gives you a wide field of view perfectly framed for M31, while allowing you to capture full-color data with your monochrome camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of using a Nikon lens with the ZWO adapter for the Rho Ophiuchi cloud complex?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Rho Ophiuchi cloud complex is an enormous region of the sky that requires a very wide field of view. Using a fast, wide-angle Nikon lens (e.g., 50mm f\/1.8) with the ZWO EFW-Nikon adapter allows you to capture the entire complex in a single frame. This is a field of view that is difficult or impossible to achieve with most telescopes, making this adapter an essential tool for ultra-wide-field astrophotography.\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-EFW-NIKON-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFilter Wheel Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eNikon F-mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Camera Back Focus\u003c\/td\u003e\n\u003ctd\u003e6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Thickness\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible ZWO EFW\u003c\/td\u003e\n\u003ctd\u003e1.25\", 31mm, 36mm models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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 EFW-Nikon II 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\"\u003eSpacers\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 4\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.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\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967453720861,"sku":"ZWO-EFW-Nikon-II","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Nikon-Lens-Adapter-EFW-1__40075.1597108031.1280.1280.jpg?v=1684342354"},{"product_id":"zwo-nikon-t2-adapter","title":"ZWO Nikon-T2 Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAttaches Nikon F-mount lenses to ZWO cameras\u003c\/li\u003e\n\u003cli\u003eStandard M42x0.75 T-thread camera interface\u003c\/li\u003e\n\u003cli\u003e29mm main body length for 17.5mm back-focus cameras\u003c\/li\u003e\n\u003cli\u003eIncludes 5mm extender for 12.5mm back-focus cameras\u003c\/li\u003e\n\u003cli\u003e2-Year Manufacturer Warranty\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 Nikon T2 Adapter for ASI Cameras\u003c\/h2\u003e\n\u003cp\u003eThe ZWO Nikon-T2 II Adapter connects your Nikon F-mount lenses to any ZWO ASI camera with a standard M42 T-thread, providing a rigid connection backed by a 2-year warranty. Its primary 29mm body is precisely machined to achieve the correct 46.5mm Nikon flange distance when paired with a camera that has 17.5mm of back focus. For cameras with 12.5mm of back focus, the included 5mm T2 extender creates the necessary 34mm of spacing for a sharp, focused field across the entire 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\u003eAchieve Perfect 46.5mm Flange Distance\u003c\/h3\u003e\n\u003cp\u003eThis adapter system is engineered to solve the primary challenge of using DSLR lenses on dedicated astronomy cameras: achieving the exact flange-to-sensor distance the lens was designed for. By combining the 29mm adapter body with ZWO cameras having 17.5mm of back focus (like most cooled models), you precisely hit the 46.5mm distance required by Nikon F-mount lenses. This ensures sharp stars corner-to-corner, free from the aberrations caused by incorrect spacing.\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\u003eConfigurable Spacing: 29mm and 34mm Paths\u003c\/h3\u003e\n\u003cp\u003eZWO cameras come in two primary back-focus configurations, and this adapter accommodates both. The main 29mm adapter is the correct length for cooled cameras with 17.5mm of back focus. For uncooled planetary or guide cameras with 12.5mm of back focus, simply add the included 5mm T2 extender between the adapter and the camera to establish the required 34mm total adapter length.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e17.5mm Back-Focus Cameras:\u003c\/strong\u003e Use the 29mm adapter body only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12.5mm Back-Focus Cameras:\u003c\/strong\u003e Use the 29mm adapter body plus the 5mm T2 extender.\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\u003eDesigned for APS-C and Smaller Sensors\u003c\/h3\u003e\n\u003cp\u003eWith a clear aperture of 42mm, the Nikon-T2 adapter is capable of fully illuminating sensors up to APS-C size without vignetting from the adapter itself. This makes it an ideal choice for pairing wide-angle or telephoto Nikon glass with popular ZWO cameras. Note that this adapter is not recommended for full-frame sensors like those in the ASI6200 or ASI2400, as the M42 T-thread itself becomes the limiting factor for the image circle.\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 do I know if I need the 5mm extender for my ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need the \u003cstrong\u003e5mm T2 extender\u003c\/strong\u003e if your ZWO camera has \u003cstrong\u003e12.5mm of native back focus\u003c\/strong\u003e. This typically includes the smaller, uncooled \"puck\" style planetary and guide cameras. If your camera has \u003cstrong\u003e17.5mm of back focus\u003c\/strong\u003e, like most ZWO cooled \"Pro\" models, you should connect the \u003cstrong\u003e29mm adapter\u003c\/strong\u003e directly to the camera without the extender.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO Nikon-T2 Adapter with full-frame cameras like the ASI6200?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is not recommended for ZWO's full-frame cameras. While the adapter has a 42mm clear aperture, the M42 T-threads on the camera side are too narrow to pass a full-frame image circle without causing significant vignetting. It is designed for cameras with APS-C or smaller sensors.\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 ZWO Nikon-T2 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The adapter is designed to accept standard 2\" (M48x0.75 thread) filters. The filter threads are located inside the adapter, allowing you to install a light pollution or narrowband filter between your Nikon lens and ZWO camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow can I use the ZWO Nikon-T2 adapter to image the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eM31 is a massive target, making it perfect for camera lenses. A common choice is a 200mm or 300mm telephoto lens attached to a camera like the ASI533MC Pro using this adapter. This combination gives you a wide field of view to capture the entire galaxy and its companions, M32 and M110, in a single frame from a portable setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of Nikon lens works best with the ZWO Nikon-T2 adapter for wide-field nebula?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor large targets like the North America Nebula (NGC 7000) or the Rho Ophiuchi cloud complex, a fast, wide-angle lens is ideal. A high-quality 50mm f\/1.8 or 85mm f\/1.4 Nikon lens, when stopped down slightly to f\/2.8, provides a sharp, flat field that can capture enormous areas of nebulosity in a single shot when paired with a sensitive ZWO camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the thread type on the camera side of the ZWO Nikon-T2 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe camera side of the adapter uses the universal \u003cstrong\u003eM42x0.75 T-thread\u003c\/strong\u003e, also known as a T2 thread. This is the standard connection for almost all dedicated astronomy cameras, ensuring broad compatibility across the ZWO ASI camera lineup.\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-NIKON-T2-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eNikon F-mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mount\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 (T2-thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Length\u003c\/td\u003e\n\u003ctd\u003e29 mm (Main Body)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtender Length\u003c\/td\u003e\n\u003ctd\u003e5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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\"\u003eNikon-T2 II Adapter (29mm)\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\"\u003eT2 Extender (5mm)\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\"\u003eSpacers\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 4\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.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":44967454343453,"sku":"ZWO-Nikon-T2-II","price":97.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Nikon-T2-Adapter__87675.1597108397.1280.1280.jpg?v=1684342360"},{"product_id":"zwo-filter-drawer-for-eos-lens","title":"ZWO Filter Drawer for EOS Lens","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EOS lenses to ZWO ASI cameras\u003c\/li\u003e\n\u003cli\u003eAccepts standard 2\" mounted filters\u003c\/li\u003e\n\u003cli\u003eMagnetic holder for secure, fast filter changes\u003c\/li\u003e\n\u003cli\u003eAdds 26.5mm of optical thickness\u003c\/li\u003e\n\u003cli\u003eM42x0.75 camera-side 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\u003eZWO Filter Drawer for EOS Lens\u003c\/h2\u003e\n\u003cp\u003eThe ZWO Filter Drawer for EOS Lens creates the critical link between your Canon EOS lenses and ZWO ASI cooled cameras, enabling the use of 2\" mounted filters within a minimal 26.5mm optical path. It is engineered specifically for ASI cameras with 17.5mm of back focus and connects via a standard M42x0.75 thread, allowing you to turn your high-quality DSLR lenses into true astrographs for narrowband or light pollution 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\u003eIntegrate 2\" Filters with Canon EOS Lenses\u003c\/h3\u003e\n\u003cp\u003eThis drawer solves the primary challenge of using DSLR lenses for serious astrophotography: adding filtration. By accepting a standard 2\" mounted filter, you can now use your EOS or EF-S lenses with multi-bandpass nebula filters or aggressive narrowband filters to capture high-contrast images of emission nebulae like the North American Nebula (NGC 7000) from light-polluted skies.\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\u003eMagnetic Holder for a 26.5mm Optical Path\u003c\/h3\u003e\n\u003cp\u003eThe core of the design is a magnetic slide-in holder that secures the 2\" filter with no threads to cross or jam in the dark. This system provides a positive, repeatable seating that maintains optical alignment shot after shot. At only 26.5mm thick, the entire assembly is compact enough to maintain focus with a wide range of EOS lenses when paired with a compatible 17.5mm back focus ZWO camera.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong Magnetic Retention:\u003c\/strong\u003e Prevents the filter holder from accidentally sliding out, even when the telescope is pointed at zenith.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid Filter Swaps:\u003c\/strong\u003e Makes it possible to switch between a light pollution filter and a narrowband filter in seconds without disassembling the camera 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\u003eM42 Threads and M54 Adapter for ASI Camera Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe drawer features a native male M42x0.75 thread for direct connection to ZWO's smaller-format cooled cameras. For imagers using full-frame sensors, ZWO includes an M54M-M42F adapter. This ensures you can connect the filter drawer to larger cameras while maintaining the correct spacing and avoiding vignetting, making it a flexible solution for a wide range of ZWO's cooled camera lineup (excluding the ASI GT series).\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 ASI cameras are compatible with the ZWO Filter Drawer for EOS Lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter drawer is designed for ZWO ASI cooled cameras that have a \u003cstrong\u003e17.5mm back focus\u003c\/strong\u003e distance. This includes many popular models, but it explicitly excludes the ASI GT series, which has an integrated filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO FD-EOS with my Canon EF-S lens and an ASI294MC Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The drawer is compatible with both Canon EOS and EF-S lenses. The ASI294MC Pro has the required 17.5mm back focus, making this combination a perfect match for 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 attach a full-frame camera like the ASI6200MC Pro to the ZWO FD-EOS?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou use the included \u003cstrong\u003eM54M-M42F adapter\u003c\/strong\u003e. The filter drawer has a native M42 male thread. The adapter converts this to an M54 male thread, which is required to connect to full-frame ASI cameras like the ASI6200 series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the magnetic system in the ZWO FD-EOS?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe magnetic holder allows for quick and easy filter changes without needing to unscrew anything in your imaging train. This is especially useful in the dark, as it reduces the risk of dropping a filter or upsetting the camera's rotation and focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat type of filters fit in the ZWO FD-EOS Filter Drawer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe drawer is designed to hold one standard \u003cstrong\u003e2\" mounted filter\u003c\/strong\u003e. The internal thread of the holder is M48x0.75, which is the standard for this filter size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO FD-EOS Filter Drawer cause vignetting with my lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen used with the appropriate camera sensor size, vignetting should be minimal. Using a 2\" filter is sufficient for up to full-frame sensors. The included M54 adapter for larger cameras also helps ensure the light path is not obstructed.\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-FD-EOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Type\u003c\/td\u003e\n\u003ctd\u003eFilter Drawer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Compatibility\u003c\/td\u003e\n\u003ctd\u003eCanon EOS \/ EF-S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Compatibility\u003c\/td\u003e\n\u003ctd\u003eZWO ASI Cooled Cameras with 17.5mm back focus (excluding GT series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003e2\" Mounted (M48x0.75 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Thread\u003c\/td\u003e\n\u003ctd\u003eMale M42x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Thickness\u003c\/td\u003e\n\u003ctd\u003e26.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\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 Filter Drawer for EOS Lens\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\"\u003eM54M-M42F Adapter\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.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\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967454769437,"sku":"ZWO-FD-EOS","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Filter-Drawer-EOS-Lens-3__75070.1597109331.1280.1280.jpg?v=1684342388"},{"product_id":"lunt-8x-reducer-field-flattener","title":"Lunt .8X Reducer\/Field Flattener","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal length by a factor of 0.8x\u003c\/li\u003e\n\u003cli\u003eWidens the photographic field of view\u003c\/li\u003e\n\u003cli\u003eFlattens the image field for sharp, edge-to-edge stars\u003c\/li\u003e\n\u003cli\u003eOptimized for solar and night-sky astrophotography\u003c\/li\u003e\n\u003cli\u003eMulti-coated optics for high contrast\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\u003eLunt .8X Reducer\/Field Flattener\u003c\/h2\u003e\n\u003cp\u003eThe Lunt .8X Reducer\/Field Flattener is an essential astrophotography accessory that reduces your telescope's focal length by a factor of 0.8x, delivering a wider, flatter field of view for framing the entire solar disk or large prominences 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\u003eA 0.8x Focal Reduction for Wider Solar Fields\u003c\/h3\u003e\n\u003cp\u003eThis accessory decreases your telescope's effective focal length by a factor of 0.8x, expanding your camera sensor's field of view. This is critical for imagers who need to capture large-scale solar features or wide night-sky vistas without resorting to mosaics. The integrated flattener ensures the entire frame, from center to edge, remains sharp and free of distortion, a crucial feature for producing high-quality images.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Coated Optics:\u003c\/strong\u003e Ensures maximum light transmission and minimizes internal reflections for high-contrast views of delicate solar details like filaments and spicules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Housed in a lightweight yet sturdy aluminum body, it adds minimal weight to your imaging train, preserving your mount's balance and tracking accuracy.\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\u003eThe 0.8x Advantage in Solar Imaging\u003c\/h3\u003e\n\u003cp\u003eBy reducing the focal length, this accessory also \"speeds up\" your optical system, lowering its effective f-ratio. A faster system allows you to use significantly shorter exposure times, which is the key to freezing atmospheric turbulence and capturing razor-sharp solar details. For high-frame-rate solar imaging, this reduction in exposure time can be the deciding factor between a soft image and a scientifically valuable one.\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 Lunt .8X Reducer\/Field Flattener primarily do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt .8X Reducer\/Field Flattener serves two main purposes for astrophotography. It \u003cstrong\u003ereduces your telescope's focal length by 0.8x\u003c\/strong\u003e to provide a wider field of view, and it \u003cstrong\u003eflattens the image field\u003c\/strong\u003e to ensure stars and solar details remain sharp across the entire sensor, from corner to corner.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt .8X Reducer affect the f-ratio of an f\/10 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt makes the telescope \"faster\" by reducing the f-ratio. To calculate the new f-ratio, you simply multiply the original f-ratio by the reduction factor. For an f\/10 telescope, the new photographic f-ratio would be \u003cstrong\u003ef\/8 (10 x 0.8)\u003c\/strong\u003e. This allows for shorter exposure times, which is critical for freezing atmospheric seeing during solar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt .8X Reducer recommended for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this accessory is designed specifically for astrophotography. While it may come to focus visually in some setups, its optical corrections are optimized for a flat sensor, not the human eye. For visual use, an eyepiece with a longer focal length is the correct way to achieve a wider true field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a \"Field Flattener\" important for the Lunt .8X Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost telescopes naturally produce a curved focal plane, which means that if the center of your image is in focus, the edges will be slightly out of focus, causing stars to appear elongated. A field flattener corrects this curvature, ensuring the entire image projected onto your camera's flat sensor is perfectly sharp, a non-negotiable feature for serious astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Lunt .8X Reducer work with my DSLR or a dedicated astronomy camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Lunt .8X Reducer is designed to be compatible with a wide range of cameras, including DSLRs, mirrorless cameras, and dedicated CMOS\/CCD astronomy cameras. You will need the appropriate T-ring and adapters to achieve the correct spacing for your specific camera model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt .8X Reducer help when imaging the full solar disk?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMany telescope and camera combinations produce an image scale that is too large to fit the entire Sun on the sensor. By reducing the focal length by 0.8x, this accessory effectively \"zooms out,\" allowing you to frame the full solar disk and any surrounding prominences in a single exposure, avoiding the need for complex and time-consuming mosaics.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS130-.8CAAFF\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\"\u003eLunt .8X Reducer\/Field Flattener\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\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\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":"sbig-stf-camera-lens-adapter-cla","title":"SBIG STF Camera Lens Adapter - CLA","description":"\u003c!-- more --\u003e\u003cdiv\u003eCamera Lens Adapters for STF cameras. Also works with STT cameras. Canon and Nikon mount versions are available.\u003c\/div\u003e","brand":"SBIG","offers":[{"title":"Nikon to Filter Wheel -Large","offer_id":44967715537181,"sku":"DL-CLA-FW-NIKON","price":309.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SBIG-STF-Camera-Lens-Adapter-CLA-Nikon-Large__76213.1600282397.1280.1280.jpg?v=1684345611"},{"product_id":"sbig-stxl-camera-lens-adapter-cla","title":"SBIG STXL Camera Lens Adapter - CLA","description":"\u003c!-- more --\u003e\u003cdiv\u003eCamera Lens Adapters for STXL cameras with FW8S-STXL filter wheels.\u003c\/div\u003e","brand":"SBIG","offers":[{"title":"Nikon","offer_id":44967715897629,"sku":"DL-CLA-X-NIKON","price":379.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SBIG-STXL-Camera-Lens-Adapter-CLA-Canon__33955.1600282399.1280.1280.jpg?v=1684345553"},{"product_id":"sbig-t-to-c-mount-lens-adapter","title":"SBIG T- to C-mount Lens Adapter","description":"\u003c!-- more --\u003e\u003cdiv\u003eT-mount to C-mount lens adapter.\u003c\/div\u003e","brand":"SBIG","offers":[{"title":"Default Title","offer_id":44967717339421,"sku":"DL-51532","price":114.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SBIG-T-to-C-mount-Lens-Adapter-1__88020.1600282405.1280.1280.jpg?v=1684345595"},{"product_id":"sbig-c-mount-adapter-for-rgh-st-i","title":"SBIG C-Mount Adapter for RGH \/ ST-I","description":"\u003c!-- more --\u003e\u003cdiv\u003eC-mount lens adapter for Remote Guide Head and ST-I. This is the same adapter used with the Kowa lens in the RGH Guider Kit.\u003c\/div\u003e","brand":"SBIG","offers":[{"title":"Default Title","offer_id":44967718289693,"sku":"DL-10126","price":99.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SBIG-C-Mount-Adapter-for-RGH-ST-I-1__05011.1656444473.1280.1280.jpg?v=1684345621"},{"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 a non-marring brass compression ring on the eyepiece holder\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 The 1.25\" eyepiece holder uses a brass compression ring, ensuring a firm grip on your camera or eyepiece without scratching its barrel.\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 Ring\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" 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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Plug\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"}],"url":"https:\/\/davidastro.com\/collections\/correctors-and-reducers.oembed?page=6","provider":"David Astro","version":"1.0","type":"link"}