{"title":"Sky-Watcher Field Flatteners, Reducers \u0026 Coma Correctors","description":"\u003cp\u003eSky-Watcher field flatteners, reducers and coma correctors are matched to specific Sky-Watcher telescopes to give round stars across the sensor. Most are dedicated reducer\/flatteners: 0.77x for the Esprit 120, Esprit 150 and Evostar 150DX, 0.85x for the Evostar 72ED, 80, 100 and 120, and 0.9x for the Evolux 62ED and 82ED.\u003c\/p\u003e\u003cp\u003eThe range also includes a flattener for the Evoguide 50ED and the Quattro coma corrector for the f\/4 Quattro imaging Newtonians.\u003c\/p\u003e","products":[{"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\u003eIt is designed and optimized for the f\/4 Sky-Watcher Quattro imaging Newtonians (Quattro 200P, 250P and 300P). Other f\/4 Newtonians may work, but optimal results are only assured on the Quattro f\/4 models. In every case the corrector needs 55mm of back focus from its M48 camera thread to the sensor.\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 is critical for its performance. The Quattro Coma Corrector requires 55mm of back focus, measured from its M48 camera thread to the camera sensor. Whether you need spacers depends on your camera and imaging train: add spacers as needed so the total distance equals 55mm.\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\u003ctr\u003e\n\u003ctd\u003eOptimized For\u003c\/td\u003e\n\u003ctd\u003ef\/4 Sky-Watcher Quattro imaging Newtonians\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eQuattro 200P, 250P and 300P (f\/4)\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 Thread\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass\u003c\/td\u003e\n\u003ctd\u003eED FPL51 and Schott glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eS20204\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\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":"sky-watcher-esprit-120-0-77x-reducer-flattener","title":"Sky-Watcher Esprit 120 0.77x Reducer\/Flattener","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts the Esprit 120 to a 647mm f\/5.4 astrograph\u003c\/li\u003e\n\u003cli\u003eProvides a 0.77x focal reduction factor\u003c\/li\u003e\n\u003cli\u003eCuts required exposure times by 68% compared to the native f\/7\u003c\/li\u003e\n\u003cli\u003eDelivers a 34mm fully illuminated and flattened image circle\u003c\/li\u003e\n\u003cli\u003eOffers dual back focus options of 95mm and 55mm\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 Esprit 120 0.77x Reducer\/Flattener\u003c\/h2\u003e\n\u003cp\u003eThis dedicated 3-element Sky-Watcher Esprit 120 0.77x Reducer\/Flattener converts the native 840mm f\/7 optical system into a 647mm f\/5.4 configuration, cutting exposure times by about 68%. It is a full-frame reducer with a fully illuminated 34mm imaging plane, giving a 3.18 x 2.12 degree field of view on a full-frame sensor. Back focus is 95mm from the start of the M78 x 1 male thread, or 55mm with the back focus spacer and M48 ring installed.\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\u003eFrom f\/7 to f\/5.4: Cut Exposure Times by 68%\u003c\/h3\u003e\n\u003cp\u003eBy increasing the optical speed to f\/5.4, this reducer dramatically shortens the sub-exposure times needed to capture faint detail. This 68% reduction in acquisition time means you gather significantly more signal in a single imaging session, improving your signal-to-noise ratio and revealing fainter structures in nebulae and galaxies.\u003c\/p\u003e\n\u003cp\u003eThe 0.77x reduction also widens your field of view: a full-frame sensor captures a 3.18 x 2.12 degree patch of sky, while an APS-C sensor covers 2.08 x 1.39 degrees.\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\u003e34mm Corrected Field: Full-Frame Illumination for the Esprit 120\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for the Esprit 120, this 3-element accessory is both a reducer and a flattener. Sky-Watcher states it delivers excellent field flatness and full illumination with minimized color fringing across the entire 34mm imaging plane.\u003c\/p\u003e\n\u003cp\u003eAccording to Sky-Watcher, no universal reducer flattener will deliver the results of this dedicated reducer on the Esprit 120. It threads directly onto the focuser drawtube once the 2\" ring adaptor has been unscrewed and removed.\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\u003eBack Focus: 95mm Native or 55mm with Spacer and M48 Ring\u003c\/h3\u003e\n\u003cp\u003eFor best results, the distance between the reducer's last lens and the sensor should be exactly 95mm, measured from the edge marking the start of the M78 x 1 male thread. With a DSLR, Sky-Watcher's method is to screw the extender tube onto the reducer, then the enlarged 48 mm T-ring and the camera. For astronomical cameras, a coupling ring with a female M78 x 1 thread places the sensor at the correct 95mm distance.\u003c\/p\u003e\n\u003cp\u003eRetailers also give a 55mm back focus with the back focus spacer and M48 ring installed. A built-in 2\" filter cell provides a location for light pollution or narrowband filters.\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 Esprit 120 0.77x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is speed. By converting the telescope from \u003cstrong\u003ef\/7 to f\/5.4\u003c\/strong\u003e, it reduces the required exposure time for any given target by \u003cstrong\u003e68%\u003c\/strong\u003e. It also flattens the field for sharp stars across a full-frame sensor and provides a wider field of view for imaging large celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 0.77x reducer on a telescope other than the Sky-Watcher Esprit 120?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This reducer\/flattener is designed specifically for the \u003cstrong\u003eSky-Watcher Esprit 120's 840mm f\/7\u003c\/strong\u003e system. Sky-Watcher states it is not compatible with other telescopes, even refractors with the same aperture and focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the correct 55mm back focus with the Esprit 120 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRetailers state the \u003cstrong\u003e55mm back focus\u003c\/strong\u003e applies with the \u003cstrong\u003eback focus spacer and M48 adapter ring\u003c\/strong\u003e installed. Without them, the reducer's back focus is 95mm, measured from the start of the M78 x 1 male thread.\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 Esprit 120 0.77x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, there are two options for using 2\" (48mm) filters. The reducer features a \u003cstrong\u003ebuilt-in 2\" filter cell\u003c\/strong\u003e for direct installation. Additionally, if you are using a DSLR extender tube, a 48mm filter can be mounted inside it via its 48 x 0.75mm threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the 95mm back focus option for on the Esprit 120 Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe native \u003cstrong\u003e95mm back focus\u003c\/strong\u003e is measured from the start of the reducer's M78 x 1 male thread to the sensor. Sky-Watcher's DSLR setup reaches it with the extender tube and enlarged 48 mm T-ring; for astronomical cameras, a coupling ring with a female M78 x 1 thread is used to place the sensor at 95mm.\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\u003eManufacturer SKU\u003c\/td\u003e\n\u003ctd\u003eS20209\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope\u003c\/td\u003e\n\u003ctd\u003eSky-Watcher Esprit 120 (840 mm f\/7)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-element Reducer\/Flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.77x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length\u003c\/td\u003e\n\u003ctd\u003e647 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExposure Time Reduction\u003c\/td\u003e\n\u003ctd\u003e68% (vs. native f\/7)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIlluminated \u0026amp; Flattened Field\u003c\/td\u003e\n\u003ctd\u003e34 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField of View (Full Frame)\u003c\/td\u003e\n\u003ctd\u003e3.18 x 2.12 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField of View (APS-C)\u003c\/td\u003e\n\u003ctd\u003e2.08 x 1.39 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNative Back Focus\u003c\/td\u003e\n\u003ctd\u003e95 mm from M78 x 1 male thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard Back Focus\u003c\/td\u003e\n\u003ctd\u003e55 mm with back focus spacer and M48 ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eThreads directly onto Esprit 120 focuser drawtube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExit Thread\u003c\/td\u003e\n\u003ctd\u003eM78 x 1 male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Adapter Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 (with supplied adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Support\u003c\/td\u003e\n\u003ctd\u003eBuilt-in 2\" filter cell; 48 mm (2\") filter can also mount inside the DSLR extender tube (48 x 0.75 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e910 g (2.0 lb) including end 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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.77x reducer\/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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEnd caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 set\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\"\u003eM48 adapter ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\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\/Sky-Watcher_Esprit_EDX_120_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\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\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":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio to f\/5.4\u003c\/li\u003e\n\u003cli\u003eProvides a 36mm fully illuminated field\u003c\/li\u003e\n\u003cli\u003e0.77x reduction factor changes focal length to 810mm\u003c\/li\u003e\n\u003cli\u003eCuts exposure times by 68%\u003c\/li\u003e\n\u003cli\u003eSupplies 55mm back focus with included M48 adapter and spacer\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\u003eSky-Watcher Esprit 150 0.77x Reducer\/Flattener\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Esprit 150 0.77x Reducer\/Flattener is a dedicated optical corrector that transforms the Esprit 150ED and 150EDX refractors from f\/7 to a much faster f\/5.4. This 0.77x reduction shortens the telescope's focal length from 1050mm to 810mm, cutting required exposure times by about 68%. It flattens the field for pinpoint stars to the edge and delivers a 36mm fully illuminated field suitable for full-frame sensors, with a 90mm back focus, or 55mm with the supplied M48 adapter and back focus spacer.\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\u003eFrom f\/7 to f\/5.4: A 68% Reduction in Exposure Time\u003c\/h3\u003e\n\u003cp\u003eBy converting the Esprit 150's native f\/7 optical system to f\/5.4, this reducer cuts the exposure time needed by about 68% compared with the native configuration. You can collect more data in a single night or capture faint detail in shorter sub-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\u003eA 36mm Corrected Field for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThis corrector not only reduces focal length but also flattens the field for pinpoint stars to the edge. Its 36mm fully illuminated field is large enough for full-frame sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90mm and 55mm Back Focus Options\u003c\/h3\u003e\n\u003cp\u003eThe reducer has 90mm of back focus. By installing the supplied M48 adapter and back focus spacer, the required back focus becomes 55mm, making it straightforward to attach cameras and filter wheels with M48 threads.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e90mm Native Back Focus:\u003c\/strong\u003e Back focus of the reducer without the adapter and spacer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e55mm Back Focus:\u003c\/strong\u003e Achieved with the included spacer and M48 adapter, for cameras and filter wheels with M48 threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Design:\u003c\/strong\u003e This corrector is matched to the Esprit 150ED and 150EDX refractors. Sky-Watcher states its Esprit reducer flatteners are not compatible with other telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for my setup with the Esprit 150 Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer's back focus is \u003cstrong\u003e90mm\u003c\/strong\u003e. With the supplied M48 adapter and back focus spacer installed, the required back focus becomes \u003cstrong\u003e55mm\u003c\/strong\u003e, which makes it straightforward to attach cameras and filter wheels with M48 threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Esprit 150 0.77x Reducer compatible with my non-Sky-Watcher telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This reducer\/flattener is a dedicated corrector for the Sky-Watcher Esprit 150ED and Esprit 150EDX refractors. Sky-Watcher states that its Esprit reducer flatteners are specifically designed for their telescope and are not compatible with other telescopes, even refractors with the same aperture and focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 68% exposure time reduction mean for my Esprit 150EDX imaging sessions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 68% reduction means an exposure that would take 10 minutes at the native f\/7 takes about 3 minutes and 12 seconds at f\/5.4. This lets you gather about three times as much data in the same amount of time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Esprit 150 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 delivers a 36mm fully illuminated field, which retailers describe as large enough for full-frame sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the 55mm back focus with the Esprit 150 Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer ships with a back focus spacer and an M48 thread adapter. With both installed, the required back focus becomes 55mm instead of the native 90mm.\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\u003eManufacturer SKU\u003c\/td\u003e\n\u003ctd\u003eS20215\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescopes\u003c\/td\u003e\n\u003ctd\u003eSky-Watcher Esprit 150ED \u0026amp; 150EDX (1050 mm f\/7)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.77x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length\u003c\/td\u003e\n\u003ctd\u003e810 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNative Focal Length \/ Ratio\u003c\/td\u003e\n\u003ctd\u003e1050 mm \/ f\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExposure Time Reduction\u003c\/td\u003e\n\u003ctd\u003e68% (vs. f\/7)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFully Illuminated Field\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (Native)\u003c\/td\u003e\n\u003ctd\u003e90 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (with Adapter)\u003c\/td\u003e\n\u003ctd\u003e55 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48 (with supplied adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e910 g (2.0 lb) including end 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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.77x Reducer\/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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMetal Thread-on Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 set\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\"\u003eBack Focus Spacer\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\"\u003eM48 Thread 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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\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\u003eSKU\u003c\/td\u003e\n          \u003ctd\u003eSW-S20214\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eUPC\u003c\/td\u003e\n          \u003ctd\u003e050234202145\u003c\/td\u003e\n        \u003c\/tr\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    \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}]}],"url":"https:\/\/davidastro.com\/en-int\/collections\/sky-watcher-field-flatteners-reducers-and-coma-correctors.oembed","provider":"David Astro","version":"1.0","type":"link"}