{"title":"SharpStar Optics Field Flatteners, Reducers \u0026 Coma Correctors","description":"\u003cp\u003eSharpStar Optics correctors complete a SharpStar refractor or reflector for imaging. Dedicated focal reducers exist for the 50EDPH (0.84x), 61, 76 and 94EDPH (0.8x) and the 140PH (0.74x), shortening the focal length while flattening the field. General-purpose field flatteners come in 2\" and 2.5\" sizes for other refractors.\u003c\/p\u003e\u003cp\u003eFor Newtonians, the MPCC Full Frame coma corrector gives round stars to the edge of large sensors. Match each corrector to its tube and back focus.\u003c\/p\u003e","products":[{"product_id":"sharpstar-61edph-0-8x-focal-reducer","title":"SharpStar 61EDPH 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts the SharpStar 61EDPH to a fast f\/4.5 astrograph\u003c\/li\u003e\n\u003cli\u003eProvides a 44mm image circle for full-frame sensor coverage\u003c\/li\u003e\n\u003cli\u003eThree-element air-spaced optical design\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera integration\u003c\/li\u003e\n\u003cli\u003eWeighs only 0.45kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 61EDPH 0.8x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 61EDPH 0.8x Focal Reducer transforms its dedicated telescope into a fast f\/4.5 astrograph, using a three-element air-spaced optical design to deliver a flat 44mm image circle. This reducer provides a standard 55mm back focus for easy camera integration and adds only 0.45kg to your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAn f\/4.5 System for the 61EDPH\u003c\/h3\u003e\n\u003cp\u003eDesigned exclusively for the SharpStar 61EDPH and 61EDPH II refractors, this 0.8x reducer shortens the telescope's focal ratio from f\/5.5 to a significantly faster f\/4.5. This conversion allows you to capture the same amount of light in approximately 67% of the time, dramatically increasing your efficiency during short imaging nights and enabling deeper exposures on faint deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Flat 44mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe reducer's three-element, air-spaced optics are engineered to produce a corrected 44mm image circle. This is large enough to illuminate full-frame sensors (24x36mm) without significant vignetting, ensuring your images have even brightness from corner to corner. With full-surface multi-layer coatings, the system maintains high contrast and minimizes internal reflections for clean, sharp stars across the entire field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStandard 55mm Back Focus for Seamless Integration\u003c\/h3\u003e\n\u003cp\u003eThis reducer simplifies your imaging setup by providing the industry-standard 55mm back focus from its M48x0.75 camera connection threads. This spacing is designed to accommodate a wide range of DSLRs, mirrorless cameras, and dedicated astronomy cameras, with or without filter wheels and off-axis guiders. The robust mechanical design features a 65mm outer diameter and a total length of 95mm, integrating perfectly with the 61EDPH's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the SharpStar 61EDPH 0.8x Reducer do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt converts the SharpStar 61EDPH telescope into a faster photographic instrument. By reducing the focal ratio to \u003cstrong\u003ef\/4.5\u003c\/strong\u003e, it allows you to collect light more quickly, significantly shortening required exposure times for deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this SharpStar reducer with a telescope other than the 61EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This focal reducer is optically matched specifically for the SharpStar 61EDPH and 61EDPH II models. Using it with other telescopes will result in poor optical correction and will not produce a sharp, flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 61EDPH 0.8x Reducer work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is designed to produce a flat, well-illuminated \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to cover standard full-frame sensors (36mm x 24mm) without major vignetting, delivering sharp stars to the corners of your frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 61EDPH 0.8x Reducer affect my imaging time on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy speeding up the telescope to f\/4.5, you can capture the same signal-to-noise ratio in roughly two-thirds of the time it would take at the native f\/5.5. For example, a 3-minute exposure at f\/5.5 would only require a 2-minute exposure with the reducer to achieve similar brightness, allowing you to capture more data in a single night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a filter wheel with my astronomy camera. Does the SharpStar 61EDPH reducer have enough back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. It provides the standard \u003cstrong\u003e55mm of back focus\u003c\/strong\u003e from the base of its M48 threads. This is the industry-standard distance designed to accommodate common accessories like filter wheels, off-axis guiders, and spacers in your imaging train before the camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat threads are on the camera side of the 61EDPH reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe camera side of the reducer features a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. This is the common \"2-inch filter thread\" standard used by most dedicated astronomy cameras and full-frame camera adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSharpStar 61EDPH \u0026amp; 61EDPH II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eThree-element air-spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFull-surface multi-layer coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e65mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e95mm (including M48 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpStar 61EDPH 0.8x Focal Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967741063453,"sku":"SSO-SHRD61","price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-61EDPH-Reducer-1__99821.1608945453.1280.1280.jpg?v=1684345755"},{"product_id":"sharpstar-76edph-0-8x-focal-reducer","title":"SharpStar 76EDPH 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts 76EDPH to a fast f\/4.5 focal ratio\u003c\/li\u003e\n\u003cli\u003eProduces a 44mm image circle for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for easy camera integration\u003c\/li\u003e\n\u003cli\u003eThree-element air-spaced optical design\u003c\/li\u003e\n\u003cli\u003eAdds only 0.5kg to the imaging train\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 76EDPH 0.8x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 0.8x Focal Reducer is engineered specifically to convert the 76EDPH telescope into a fast f\/4.5 astrograph, illuminating a full 44mm image circle for large-format sensors. This three-element reducer provides a standard 55mm back focus from its M48 threads, measures 77mm in length, and adds only 0.5kg to your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTransform Your 76EDPH into an f\/4.5 Astrograph\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native focal ratio of the 76EDPH to f\/4.5, this corrector significantly shortens required exposure times, allowing you to capture more signal on faint deep-sky objects in a single session. The dedicated optical design is precisely matched to the 76EDPH, ensuring sharp stars across the entire field of view.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Design:\u003c\/strong\u003e Mates directly to the 76EDPH focuser via an M74×1 thread for a secure, flex-free connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree-Element Optics:\u003c\/strong\u003e The air-spaced triplet lens structure is fully multi-coated to maximize light transmission and suppress internal reflections for high-contrast images.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThis reducer delivers a corrected, flat field across a 44mm image circle, which is large enough to accommodate full-frame (24x36mm) CMOS and CCD sensors without significant vignetting. This allows you to capture expansive targets like the Andromeda Galaxy (M31) or the Rho Ophiuchi cloud complex in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Back Focus and 360° Rotation for Easy Framing\u003c\/h3\u003e\n\u003cp\u003eIntegration into your existing imaging setup is straightforward. The reducer provides the industry-standard 55mm of back focus from its M48x0.75 camera connection, accommodating most filter wheels, off-axis guiders, and astronomy cameras with minimal adapters. An integrated 360° rotator lets you perfectly frame your target without having to loosen the camera and risk optical tilt.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M48 Threads:\u003c\/strong\u003e The camera-side connection uses M48 threads, which also accept standard 2\" astronomy filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Composition:\u003c\/strong\u003e The built-in rotator allows for fine adjustments to your image orientation, a critical feature for capturing mosaics or aligning with celestial coordinates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 0.8x Reducer do for my SharpStar 76EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer transforms your SharpStar 76EDPH into a faster, wider imaging instrument. It changes the focal ratio to \u003cstrong\u003ef\/4.5\u003c\/strong\u003e, which reduces your exposure times by about 36% and provides a wider field of view to capture larger celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 76EDPH 0.8x Reducer work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer is designed to produce a flat, corrected \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which fully illuminates standard 35mm full-frame sensors (e.g., Sony IMX571 or IMX455 based cameras) without significant light fall-off at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera and accessories to the SharpStar 76EDPH reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer has standard M48x0.75 male threads on the camera side and provides \u003cstrong\u003e55mm of back focus\u003c\/strong\u003e. This is the standard distance for many DSLR\/mirrorless cameras with a T-ring, as well as dedicated astronomy cameras when combined with filter wheels and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the 76EDPH 0.8x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the M48 threads on the camera side of the reducer are designed to accept standard \u003cstrong\u003e2\" (M48x0.75) filters\u003c\/strong\u003e. You can thread a filter directly onto the reducer before attaching your camera or filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the f\/4.5 focal ratio help when imaging faint targets like the North American Nebula (NGC 7000) with the 76EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe North American Nebula (NGC 7000) is a large, faint emission nebula. The faster \u003cstrong\u003ef\/4.5 focal ratio\u003c\/strong\u003e allows your camera sensor to collect photons more quickly compared to the telescope's native f-ratio. This means you can achieve a strong signal-to-noise ratio with shorter sub-exposures, reducing the demands on your mount's tracking accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm using an APS-C camera with my 76EDPH. Is the 44mm image circle of this reducer still beneficial?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While an APS-C sensor is smaller than the \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, using a reducer designed for a larger field ensures exceptional field flatness and star correction across your entire sensor. You will experience very tight, round stars from corner to corner, well within the \"sweet spot\" of the reducer's optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSharpStar 76EDPH Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003eThree-element air-spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm from M48 thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e77mm (including M48 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e88mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFull-surface multi-layer coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProduct Manuals\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDrivers \u0026amp; Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967749583133,"sku":"SSO-76EDPHFR","price":371.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-76EDPH-Reducer-1__79028.1609101546.1280.1280.jpg?v=1684345784"},{"product_id":"sharpstar-94edph-0-8x-focal-reducer","title":"SharpStar 94EDPH 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.8x Focal Reduction for SharpStar 94EDPH\u003c\/li\u003e\n\u003cli\u003eCreates a Fast f\/4.4 Optical System\u003c\/li\u003e\n\u003cli\u003e4-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e50mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 94EDPH 0.8x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThis dedicated 0.8x focal reducer transforms the SharpStar 94EDPH into a fast f\/4.4 imaging system, using a 4-element optical design to deliver a corrected 50mm image circle. The standard 55mm back focus simplifies camera and accessory integration, while the reducer itself has a maximum outside diameter of 88mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Faster, Wider Field: The 4-Element Design for f\/4.4 Imaging\u003c\/h3\u003e\n\u003cp\u003eBy reducing the focal ratio to f\/4.4, this accessory significantly shortens required exposure times, allowing you to gather more signal on faint targets in a single session. The wider field of view also makes it possible to frame large celestial objects, like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000), in their entirety.\u003c\/p\u003e\n\u003cp\u003eThe 4-element optical layout is engineered to correct for optical aberrations across the field, ensuring that stars remain sharp and round from the center to the edge of the frame. This corrective power is essential for maintaining the high image quality of the 94EDPH's triplet objective.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Ready: 50mm Image Circle and 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe reducer's optical design produces a fully illuminated and corrected 50mm image circle. This generous field is large enough to cover full-frame sensors (like the Sony a7 series or dedicated cameras with IMX571\/IMX455 sensors) without vignetting, maximizing the imaging potential of the telescope.\u003c\/p\u003e\n\u003cp\u003eA standard 55mm back focus distance simplifies the process of connecting most DSLRs, mirrorless cameras, and dedicated astronomy cameras along with their associated filter wheels or off-axis guiders. This industry-standard spacing ensures broad compatibility with your existing imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SharpStar 94EDPH reducer cover my full-frame camera sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e The reducer produces a \u003cstrong\u003e50mm image circle\u003c\/strong\u003e, which is more than large enough to fully illuminate a standard 36x24mm full-frame sensor without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this 0.8x reducer help when imaging a target like the Heart Nebula (IC 1805) with the 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer widens the field of view, allowing you to capture the entire expanse of large targets like the Heart Nebula in a single frame. It also speeds up the optics to \u003cstrong\u003ef\/4.4\u003c\/strong\u003e, reducing the exposure time needed to capture faint nebulosity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back focus of the SharpStar 94EDPH 0.8x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is \u003cstrong\u003e55mm\u003c\/strong\u003e. This is a standard distance for many imaging setups, making it easy to integrate with accessories like T-rings, filter wheels, and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 4-element design in the SharpStar 94EDPH reducer do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e4-element design\u003c\/strong\u003e acts as both a reducer and a field flattener. It is optically matched to the 94EDPH telescope to ensure stars are sharp and round across the entire 50mm image circle, correcting for field curvature and other off-axis aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the final focal ratio of the SharpStar 94EDPH when using this reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 0.8x reducer converts the SharpStar 94EDPH into a fast \u003cstrong\u003ef\/4.4\u003c\/strong\u003e imaging system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this reducer compatible with other telescopes besides the SharpStar 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer is specifically designed and optically matched for the SharpStar 94EDPH telescope. Using it with other telescopes is not recommended as it may not provide a fully corrected field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinal Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4 Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e88mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967749812509,"sku":"SSO-94EDPHFR","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-94EDPH-Reducer-1__36482.1609108367.1280.1280.jpg?v=1684345787"},{"product_id":"sharpstar-140ph-0-74x-focal-reducer","title":"SharpStar 140PH 0.74x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio to f\/4.8\u003c\/li\u003e\n\u003cli\u003e0.74x reduction factor\u003c\/li\u003e\n\u003cli\u003e3-element optical design\u003c\/li\u003e\n\u003cli\u003e44mm corrected image circle\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 140PH 0.74x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 140PH 0.74x Focal Reducer is a dedicated 3-element corrector that converts the 140PH APO into a faster f\/4.8 astrograph for wide-field imaging. It delivers a corrected 44mm image circle to illuminate full-frame sensors and maintains the standard 55mm back focus for easy integration with cameras, filter wheels, and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe SharpStar 140PH at f\/4.8: A 0.74x Focal Reducer\u003c\/h3\u003e\n\u003cp\u003eBy shortening the telescope's effective focal length by a factor of 0.74x, this reducer widens the field of view, allowing you to capture large celestial targets in a single frame. The resulting f\/4.8 focal ratio significantly cuts down required exposure times, enabling you to collect more signal on faint nebulae and galaxies in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e44mm Image Circle \u0026amp; 55mm Back Focus for Full-Frame Cameras\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern sensors, this reducer projects a fully illuminated and corrected 44mm image circle, providing edge-to-edge sharpness on full-frame (36x24mm) CMOS and CCD cameras. The industry-standard 55mm back focus simplifies your imaging train; simply add your camera and standard T-ring or filter wheel setup to achieve perfect spacing without complex calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the SharpStar 140PH 0.74x Reducer do to my telescope's performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer makes your SharpStar 140PH telescope \"faster\" by changing its focal ratio to \u003cstrong\u003ef\/4.8\u003c\/strong\u003e. This allows you to capture more light in shorter exposures and provides a wider field of view, which is ideal for large deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 44mm image circle of the 140PH Reducer large enough for my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e44mm image circle\u003c\/strong\u003e is specifically designed to fully illuminate the 43.3mm diagonal of a standard full-frame sensor (e.g., Sony IMX571, IMX455, or DSLR sensors) with corrected stars to the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the correct 55mm back focus with the SharpStar 140PH Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is measured from the rear flange of the reducer to your camera's sensor. This is a standard distance. For a DSLR, a standard 48mm T-ring typically provides the correct spacing. For dedicated astronomy cameras, you use a combination of included camera spacers, a filter wheel, and an off-axis guider to reach the 55mm total distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 0.74x reducer work with telescopes other than the SharpStar 140PH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this reducer is optically matched specifically for the SharpStar 140PH APO triplet refractor. Using it with other telescopes will likely result in poor image quality, field curvature, and other optical aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SharpStar 140PH 0.74x Reducer help when imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy (M31) is a very large target. The wider field of view provided by the \u003cstrong\u003e0.74x reducer\u003c\/strong\u003e allows you to capture the entire galaxy and its companions in a single frame with the 140PH. The faster \u003cstrong\u003ef\/4.8\u003c\/strong\u003e optics also let you capture faint outer dust lanes with shorter individual exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a filter wheel with the SharpStar 140PH reducer and my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e55mm back focus\u003c\/strong\u003e distance is designed to accommodate common accessories. For example, if your camera has a 17.5mm flange distance and your filter wheel is 20mm thick, you would need a 17.5mm spacer (17.5 + 20 + 17.5 = 55mm) to achieve perfect focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope\u003c\/td\u003e\n\u003ctd\u003eSharpStar 140PH APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.74x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3 Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e94mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpStar 140PH 0.74x Focal Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Drivers and Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967753580829,"sku":"SSO-140PHFR","price":615.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-140PH-Reducer-1__05468.1609108728.1280.1280.jpg?v=1684345788"},{"product_id":"sharpstar-mpcc-full-frame-coma-corrector","title":"SharpStar MPCC Full Frame Coma Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects coma in Newtonian reflectors from 150mm to 600mm aperture\u003c\/li\u003e\n\u003cli\u003eOptimized for fast focal ratios from f\/3 to f\/6\u003c\/li\u003e\n\u003cli\u003eProvides a 44mm image circle for full-frame sensors\u003c\/li\u003e\n\u003cli\u003eMaintains native focal length with a 1.0x reduction factor\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus simplifies camera connection\u003c\/li\u003e\n\u003cli\u003eFeatures a 4-element quadruplet optical design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar MPCC Full Frame Coma Corrector\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar MPCC Full Frame Coma Corrector is engineered to eliminate coma in fast Newtonian reflectors, transforming them into flat-field astrographs. Its advanced quadruplet optical design delivers pinpoint stars across a full-frame 44mm image circle, supporting sensors in everything from 150mm to 600mm aperture telescopes. With a 1.0x magnification factor, this corrector maintains your telescope's native focal length and image scale, while the industry-standard 55mm back focus and 2\" barrel ensure seamless integration into your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuadruplet Correction for f\/3 to f\/6 Newtonians\u003c\/h3\u003e\n\u003cp\u003eThis corrector utilizes a four-element, air-spaced optical layout that includes an extra-low dispersion (ED) glass element. This sophisticated design provides a high degree of aberration control, effectively neutralizing the coma inherent in parabolic mirrors, especially those with aggressive focal ratios from f\/3 to f\/6. The result is a flat, sharp field from edge to edge, allowing you to use the full resolving power of your instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Image Circle and 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for modern astrophotography, the SharpStar MPCC illuminates a 44mm image circle, fully covering full-frame (36x24mm) DSLR and dedicated CMOS\/CCD cameras without vignetting. Full-surface multi-layer coatings maximize light transmission for brighter images and higher contrast. The corrector features a standard 55mm back focus, measured from the unit's flange, which perfectly matches the spacing required by a DSLR with a standard T-ring, simplifying setup and ensuring optimal correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Standard 2\" Barrel and 0.35kg Weight\u003c\/h3\u003e\n\u003cp\u003eMechanically, the corrector is built for broad compatibility and minimal impact on your setup. It slides into any standard 2\" (50.8mm) focuser and, at a weight of only 0.35kg, it avoids placing excessive strain on the drawtube or upsetting the telescope's balance. Its total length of 118.7mm is compact enough for most focusers to accommodate without running out of in-travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSharpStar 1.0x MPCC vs. 0.95x Corrector: Native Scale or Wider Field?\u003c\/h3\u003e\n\u003cp\u003eSharpStar offers two excellent coma correctors, and the choice depends entirely on your imaging goals. The 0.95x version provides a slight focal reduction, which makes your telescope faster and captures a wider field of view—ideal for large nebulae. This 1.0x MPCC, in contrast, preserves the telescope's native focal length. This is the better choice when you want to maintain the maximum image scale for resolving details in smaller galaxies, planetary nebulae, or globular clusters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat telescopes are compatible with the SharpStar MPCC Full Frame Coma Corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis coma corrector is designed for \u003cstrong\u003eparaboloid Newtonian reflectors\u003c\/strong\u003e with apertures ranging from \u003cstrong\u003e150mm to 600mm\u003c\/strong\u003e and fast focal ratios between \u003cstrong\u003ef\/3 and f\/6\u003c\/strong\u003e. It is not suitable for refractors, SCTs, or other telescope designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the required 55mm back focus with the SharpStar MPCC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is the industry standard for many imaging systems. A typical DSLR camera with a T-ring has a sensor distance of 55mm. For dedicated astronomy cameras, you will need to use a combination of extension tubes to achieve the precise 55mm distance from the corrector's rear flange to your camera's sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SharpStar MPCC fully illuminate my full-frame camera on a 10\" f\/4 Newtonian imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The corrector's \u003cstrong\u003e44mm image circle\u003c\/strong\u003e is specifically designed to cover full-frame sensors (which have a ~43mm diagonal) without vignetting. On an f\/4 system imaging a large target like the North American Nebula (NGC 7000), you can expect a flat, evenly illuminated field with sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I get this 1.0x SharpStar MPCC or the 0.95x version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose based on your primary imaging targets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.0x MPCC (this model):\u003c\/strong\u003e Best for maintaining your telescope's native image scale. Ideal for smaller targets like the Whirlpool Galaxy (M51) or the Ring Nebula (M57) where you want maximum resolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.95x Corrector:\u003c\/strong\u003e Best for maximizing your field of view and increasing the speed of your optical system. Ideal for very large targets or mosaics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar MPCC for visual observing with my 12\" f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is optimized for imaging, the corrector will work for visual use and will provide noticeably sharper stars at the edge of the field in a low-power, wide-field eyepiece. However, its primary function is astrophotography. You must also ensure your focuser has enough in-travel to accommodate the corrector's 118.7mm length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of a 'Quadruplet' design in the SharpStar MPCC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003equadruplet (4-element) design\u003c\/strong\u003e allows for a higher degree of optical correction than simpler two-element correctors. By using four lenses, including an ED glass element, the SharpStar MPCC can better control coma and other off-axis aberrations across a wide 44mm field, especially in very fast f\/3 or f\/4 Newtonians.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003e150mm - 600mm Paraboloid Reflectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio Range\u003c\/td\u003e\n\u003ctd\u003ef\/3 - f\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification \/ Reduction Factor\u003c\/td\u003e\n\u003ctd\u003e1.0x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eQuadruplet (4-Element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFull-surface multi-layer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e118.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.35kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967764066589,"sku":"SSO-SH1XMPCC","price":427.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-MPCC-1__11195.1609112656.1280.1280.jpg?v=1684345800"},{"product_id":"sharpstar-field-flattener-2","title":"SharpStar Field Flattener - 2\"","description":"\u003c!-- more --\u003e\u003cp\u003eDesigned to fully illuminate APS-C sensor on most APO refractors. The SharpStar 2\" field flattener has a M42x0.74 male thread to connect the camera and a back focus of 55mm.\u003c\/p\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967764132125,"sku":"SSO-FF2","price":168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-Field-Flattener-2-inch-1__99353.1609113629.1280.1280.jpg?v=1684345806"},{"product_id":"sharpstar-field-flattener-2-5","title":"SharpStar Field Flattener - 2.5\"","description":"\u003c!-- more --\u003e\u003cp\u003eDesigned to fully illuminate full frame sensor on most APO refractors. The SharpStar 2.5\" field flattener has a M69 male thread to connect the camera. It also comes with a 36.5mm adapter with a M48x0.75 thread to easily attach a camera to obtain a back focus of 55mm. A M68 male thread and a M63 female thread are on the telescope side.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_Field_Flattener_2_5_inch_Back_Focus.jpg?v=1684345787\" alt=\"\"\u003e\u003c\/p\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967764197661,"sku":"SSO-FF25","price":273.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-Field-Flattener-2-5-inch-1__98032.1609114067.1280.1280.jpg?v=1684345811"},{"product_id":"sharpstar-50edph-0-84x-focal-reducer","title":"SharpStar 50EDPH 0.84x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces telescope focal ratio to f\/4.6\u003c\/li\u003e\n\u003cli\u003eConverts focal length to 230mm\u003c\/li\u003e\n\u003cli\u003eQuadruplet optical design with field flattening\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus requirement\u003c\/li\u003e\n\u003cli\u003eConnects to cameras via M48x0.75 male 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\u003eSharpStar 50EDPH 0.84x Focal Reducer\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 50EDPH 0.84x Focal Reducer is an essential accessory engineered specifically for the 50EDPH refractor, transforming it into a faster, wider imaging instrument. This quadruplet reducer converts the telescope to a 230mm focal length at a fast f\/4.6 focal ratio, all while maintaining a flat field. It establishes the standard 55mm back focus from its M48x0.75 threads and adds only 0.24kg 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\u003eFaster, Wider Imaging at f\/4.6 for the 50EDPH\u003c\/h3\u003e\n\u003cp\u003eBy shortening the telescope's effective focal length to 230mm, this 0.84x reducer significantly widens your field of view. The corresponding focal ratio of f\/4.6 allows your camera sensor to gather light much more quickly, dramatically reducing exposure times required for faint deep-sky objects. This speed is critical for capturing expansive targets like the North American Nebula (NGC 7000) or large star clusters in a single frame.\u003c\/p\u003e\n\u003cp\u003eThe quadruplet optical design doesn't just reduce the focal length; it also acts as a field flattener. This ensures that stars remain sharp and pinpoint across an APS-C sensor, correcting for the field curvature inherent in refractor optics and delivering a professional-grade image 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\u003eOptimized for APS-C Sensors with 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThis reducer is engineered to fully illuminate APS-C sized sensors, making it a perfect match for a wide range of popular astronomy cameras and DSLRs. It features a standard M48x0.75 male thread for camera connection and requires a precise 55mm back focus distance from the base of this thread to your sensor for optimal performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandardized Connection:\u003c\/strong\u003e The 55mm back focus is the industry standard for most cooled astronomy cameras when used with their included adapters, simplifying your imaging train setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Filter Threads:\u003c\/strong\u003e The reducer includes internal M48x0.75 threads, allowing you to directly mount standard 2-inch astronomy filters without needing a separate filter drawer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e At just 0.24kg, the reducer adds minimal weight and leverage to the focuser, helping to maintain system rigidity and prevent tilt.\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 SharpStar 0.84x reducer do for my 50EDPH telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt converts your SharpStar 50EDPH into a faster and wider imaging system. It changes the focal length to \u003cstrong\u003e230mm\u003c\/strong\u003e and the focal ratio to \u003cstrong\u003ef\/4.6\u003c\/strong\u003e. This allows for shorter exposure times and fitting larger celestial objects into your frame, while the quadruplet design also flattens the field for sharp stars edge-to-edge on APS-C 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 camera to the 50EDPH 0.84x Reducer to achieve the correct 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer has a male M48x0.75 thread on the camera side. You must ensure the distance from the base of this thread to your camera's sensor is exactly \u003cstrong\u003e55mm\u003c\/strong\u003e. Most dedicated astronomy cameras and DSLR\/mirrorless cameras with a standard M48 T-ring are designed to meet this 55mm spacing requirement with their included spacers.\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 this SharpStar 0.84x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer has internal M48x0.75 threads, which is the standard threading for 2-inch astronomy filters. You can thread a filter directly into the reducer before attaching it to your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the new focal length and focal ratio of the SharpStar 50EDPH with this 0.84x reducer installed?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the 0.84x reducer attached, the SharpStar 50EDPH has an effective focal length of \u003cstrong\u003e230mm\u003c\/strong\u003e and a focal ratio of \u003cstrong\u003ef\/4.6\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 50EDPH with the 0.84x reducer good for imaging the Andromeda Galaxy (M31) with an APS-C camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent combination for that target. The resulting \u003cstrong\u003e230mm\u003c\/strong\u003e focal length provides a wide field of view that can frame the entirety of the Andromeda Galaxy (M31) and its satellite galaxies on a typical APS-C sensor, while the fast \u003cstrong\u003ef\/4.6\u003c\/strong\u003e focal ratio helps capture its faint dust lanes with shorter exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the f\/4.6 focal ratio affect my exposures on faint targets like the Horsehead Nebula (Barnard 33)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ef\/4.6\u003c\/strong\u003e focal ratio is significantly \"faster\" than the native f\/5.5 of the 50EDPH. For any given exposure time, you will collect roughly 44% more light. This means you can achieve the same signal-to-noise ratio in less time, which is a major advantage for capturing faint emission nebulae like the Horsehead Nebula (Barnard 33).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (with 50EDPH)\u003c\/td\u003e\n\u003ctd\u003e230mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio (with 50EDPH)\u003c\/td\u003e\n\u003ctd\u003ef\/4.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eQuadruplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48 thread base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Filter Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.24kg\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 50EDPH 0.84x 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":47477259370781,"sku":"SSO-SHREDU50","price":153.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/63ce6bdf-d283-4cde-9b2c-07d0617072e6.png?v=1705688490"}],"url":"https:\/\/davidastro.com\/collections\/sharpstar-optics-field-flatteners-reducers-and-coma-correctors.oembed","provider":"David Astro","version":"1.0","type":"link"}