{"title":"SharpStar EDPH Triplet APO Refractors","description":"\u003cp\u003eSharpStar EDPH refractors are compact triplet apochromats aimed at astrophotography, each paired with its own focal reducer or flattener. The 50EDPH f\/5.5 is a tiny wide-field scope that travels anywhere, and the 94EDPH f\/5.5 has a 517mm focal length for nebulae and larger galaxies.\u003c\/p\u003e\u003cp\u003eThe collection also holds the dedicated 0.8x reducers for the 61, 76 and 94EDPH, the 0.84x reducer for the 50EDPH and the 61EDPHIII flattener, so you can complete or upgrade an EDPH setup.\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-94edph-f-5-5-triplet-apo","title":"SharpStar 94EDPH f\/5.5 Triplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAperture: 94mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio: f\/5.5\u003c\/li\u003e\n\u003cli\u003eFocal Length: 517mm\u003c\/li\u003e\n\u003cli\u003eOptical Design: Triplet APO with Two ED Elements\u003c\/li\u003e\n\u003cli\u003eWeight: 3.3KG\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 f\/5.5 Triplet APO\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 94EDPH f\/5.5 Triplet APO combines a 94mm aperture with a 517mm focal length in a lightweight 3.3KG optical tube assembly. Its air-spaced triplet objective, featuring two ED glass elements, achieves a theoretical resolution of 1.28 arc-seconds down to a limiting magnitude of 11.62, delivering high-contrast, color-pure images for discerning astrophotographers.\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\u003e94mm f\/5.5 Triplet APO: Dual ED Glass for Aberration-Free Images\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 94EDPH is an air-spaced triplet objective incorporating two pieces of extra-low dispersion (ED) glass. This design aggressively corrects chromatic aberration, eliminating the color fringing around bright stars that can soften images from lesser optics. The result is a sharp, high-contrast view with pinpoint stars across the field.\u003c\/p\u003e\n\u003cp\u003eThe native f\/5.5 focal ratio is fast enough for efficient deep-sky imaging, reducing required exposure times to capture faint details. This optical system is engineered to produce images where the only limit is the seeing conditions, resolving fine structures down to 1.28 arc-seconds.\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\u003eField-Ready at 3.3KG: A Compact Grab-and-Go Astrograph\u003c\/h3\u003e\n\u003cp\u003eWeighing only 3.3KG and measuring just 468mm in length, the SharpStar 94EDPH is built for portability. Its low weight and compact size allow it to be carried securely by a wide range of mid-sized equatorial mounts, reducing the need for a heavy, observatory-class setup. This makes it an ideal choice for traveling to dark-sky sites.\u003c\/p\u003e\n\u003cp\u003eThe telescope includes a robust set of mounting hardware right out of the box. A pair of CNC-machined tube rings, a Vixen-style dovetail plate, and a sturdy carrying handle ensure the optical tube is secure and easy to manage, both on and off the mount.\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\u003e517mm Focal Length: Framing Nebulae and Galaxies at f\/5.5\u003c\/h3\u003e\n\u003cp\u003eThe 517mm focal length provides a versatile field of view that is perfectly suited for many of the most popular deep-sky targets. With a modern APS-C or Micro Four Thirds sensor, you can easily frame large objects like the Andromeda Galaxy (M31) or the entire North American Nebula (NGC 7000) in a single shot.\u003c\/p\u003e\n\u003cp\u003eFor imagers seeking an even wider and faster system, an optional dedicated reducer brings the focal ratio down to f\/4.4. This accessory transforms the 94EDPH into an exceptionally fast astrograph capable of illuminating full-frame sensors, making it possible to capture vast nebulae complexes and star fields with significantly shorter exposure times.\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 94EDPH vs. 80mm APOs: The Impact of 94mm Aperture\u003c\/h3\u003e\n\u003cp\u003eWhile 80mm refractors are a popular starting point, the 94mm aperture of the 94EDPH offers a significant step up in light-gathering power and resolution. This directly translates to brighter images, shorter sub-exposure times, and the ability to resolve finer details in galactic dust lanes and planetary nebulae.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Resolution:\u003c\/strong\u003e The 94EDPH resolves down to 1.28 arc-seconds, a noticeable improvement over the ~1.45 arc-second limit of a typical 80mm refractor, revealing more intricate structures in your targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreater Light Grasp:\u003c\/strong\u003e The larger 94mm objective collects substantially more photons per second than an 80mm lens. This allows you to capture faint, extended objects with better signal-to-noise ratio in the same amount of imaging time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintained Portability:\u003c\/strong\u003e Despite its larger aperture, the 94EDPH remains highly portable at just 3.3KG, occupying a similar weight class to many fully-equipped 80mm imaging setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of objects is the SharpStar 94EDPH best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SharpStar 94EDPH excels at imaging medium to large deep-sky objects. Its \u003cstrong\u003e517mm focal length\u003c\/strong\u003e provides an ideal field of view for targets like the Andromeda Galaxy (M31), the Orion Nebula (M42), the North American Nebula (NGC 7000), and large open star clusters like the Pleiades (M45).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the optional reducer for the SharpStar 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optional reducer is recommended if you plan to use a \u003cstrong\u003efull-frame camera\u003c\/strong\u003e or want to capture very large targets in a single frame. It also speeds up the optical system to f\/4.4, reducing exposure times. For cameras with APS-C or smaller sensors, the native \u003cstrong\u003ef\/5.5 focal ratio\u003c\/strong\u003e and 517mm focal length are excellent for a wide range of nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size mount do I need for the SharpStar 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a bare optical tube weight of only \u003cstrong\u003e3.3KG\u003c\/strong\u003e, the 94EDPH is not demanding. For astrophotography, a mid-sized equatorial mount with a payload capacity of around 30 lbs (13.6 kg), such as a Sky-Watcher HEQ5 or iOptron CEM26, is a perfect match and will provide stable, accurate tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 94EDPH good for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The triplet apochromatic objective with two ED elements delivers sharp, high-contrast, and color-free views. It performs beautifully as a rich-field telescope for sweeping the Milky Way, observing open clusters, and viewing larger nebulae with appropriate filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SharpStar 94EDPH frame the Andromeda Galaxy (M31) with an APS-C sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 517mm focal length is an excellent match for framing the Andromeda Galaxy on a typical APS-C sensor. You will be able to capture the bright galactic core, its extensive dust lanes, and its two main satellite galaxies, M32 and M110, all within a single, well-composed frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar 94EDPH for high-resolution planetary imaging on Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the 94EDPH is primarily a wide-field instrument, it can be used for planetary viewing and imaging. Its \u003cstrong\u003e1.28 arc-second resolution\u003c\/strong\u003e is capable of revealing details like cloud bands on Jupiter and the Cassini Division in Saturn's rings. For imaging, you will need to add a high-quality 3x or 5x Barlow lens to increase the image scale sufficiently for a planetary camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e94mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e517mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Design\u003c\/td\u003e\n\u003ctd\u003eTriplet air-spaced APO (two ED glass elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e1.28 arc-seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e11.62\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e468mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Diameter\u003c\/td\u003e\n\u003ctd\u003e118mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e3.3KG\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\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\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\"\u003eDovetail Plate\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\"\u003eHandle\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\"\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":44967741128989,"sku":"SSO-94EDPH","price":2303.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-94EDPH-1__34426.1650566400.1280.1280.jpg?v=1684345758"},{"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-50edph-f-5-5-triplet-apo","title":"SharpStar 50EDPH f\/5.5 Triplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50mm Aperture Triplet APO Objective\u003c\/li\u003e\n\u003cli\u003e275mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/5.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eIncludes Two ED Glass Elements\u003c\/li\u003e\n\u003cli\u003e1.07kg Total Weight\u003c\/li\u003e\n\u003cli\u003e196mm Retracted Length\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 f\/5.5 Triplet APO\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 50EDPH f\/5.5 Triplet APO delivers exceptional color correction from a 50mm objective by using two extra-low dispersion (ED) glass elements in its air-spaced triplet design. With a native 275mm focal length, this ultra-portable refractor weighs just 1.07kg and measures a mere 196mm long, making it an ideal companion for travel, wide-field imaging, or as a high-end guide scope capable of reaching a limiting magnitude of 10.3.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet APO Optics: 50mm f\/5.5 with Two ED Elements\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 50EDPH is an air-spaced triplet objective, a design rarely seen in telescopes of this small 50mm aperture. Including two separate ED glass elements provides outstanding chromatic aberration control, ensuring stars are sharp, pinpoint sources of light without distracting purple fringing. The fast f\/5.5 focal ratio gathers light efficiently, making it well-suited for capturing faint, extended objects like the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUltra-Portable Build: A 1.07kg Grab-and-Go Design\u003c\/h3\u003e\n\u003cp\u003eEngineered for portability, the 50EDPH weighs only 1.07kg and has a contracted tube length of 196mm, compact enough to fit in a small camera bag. The scope features a 70mm Vixen-style dovetail plate with slotted 1\/4-20 threaded holes, allowing it to be mounted securely on astronomical mounts or standard photographic tripods. A retractable dew shield further enhances its compact form factor while protecting the objective from moisture and stray light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 360° Rotator and 1.25\" Adapter\u003c\/h3\u003e\n\u003cp\u003eThe 50EDPH is built with the astrophotographer in mind. It includes a 360° rotator for precise camera framing and a dual-speed rack-and-pinion focuser for critical 1:10 fine adjustments. For visual observers, the rear includes a standard 1.25\" adapter for use with diagonals and eyepieces. The package also includes a 2-section 5cm M48 extension tube, enabling you to achieve focus with planetary cameras or for straight-through visual observation without a diagonal.\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 makes the SharpStar 50EDPH's optics special for its size?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSharpStar 50EDPH\u003c\/strong\u003e uses a triplet air-spaced apochromatic (APO) objective that includes \u003cstrong\u003etwo ED glass elements\u003c\/strong\u003e. This is a highly advanced optical design for a 50mm telescope, providing superior color correction and sharper stars compared to standard doublet or single-ED refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I mount the SharpStar 50EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe telescope comes with a \u003cstrong\u003e70mm Vixen-style dovetail plate\u003c\/strong\u003e. This plate is compatible with most modern astronomical mounts. Additionally, it has 1\/4-20 threaded holes, allowing you to mount it directly to a standard photographic tripod for quick visual sessions or terrestrial viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the included M48 extension tubes for on the 50EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two 5cm M48 extension tubes are included to provide the correct back focus for different setups. You can use them to reach focus when using a planetary camera or when performing straight-through visual observation with a 1.25\" eyepiece without a star diagonal in the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar 50EDPH for visual observation of the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The \u003cstrong\u003e275mm focal length\u003c\/strong\u003e provides a very wide field of view, perfect for framing large objects like the Orion Nebula (M42) in its entirety. Paired with a low-power 1.25\" eyepiece, you can easily fit the nebula and its surrounding star-forming regions into a single, immersive view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 50EDPH suitable for imaging the Andromeda Galaxy (M31) with a DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 50EDPH is an excellent choice for imaging large targets like the Andromeda Galaxy (M31). Its 275mm focal length is a great match for framing the full extent of the galaxy on APS-C or even some full-frame sensors. The high-quality triplet optics will ensure the galaxy's core and dust lanes are captured with sharp, color-pure stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the limitations of a 50mm aperture on the SharpStar 50EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile its optical quality is superb, a \u003cstrong\u003e50mm aperture\u003c\/strong\u003e primarily excels at wide-field views and portability. It has a limiting visual magnitude of 10.3, meaning it is not designed for high-magnification views of planets or resolving faint details in small, distant galaxies. Its strength lies in capturing large nebulae, star clusters, and vast sections of the Milky Way.\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\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e275mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet Air-Spaced APO (with two ED glass elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Visual Magnitude\u003c\/td\u003e\n\u003ctd\u003e10.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length (Dew Shield Contracted)\u003c\/td\u003e\n\u003ctd\u003e196mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e1.07kg (including dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Interface\u003c\/td\u003e\n\u003ctd\u003e1.25\" Visual Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e50EDPH OTA\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\"\u003e2-Section 5cm M48 Extension Tube\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\"\u003e70mm Vixen-Style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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":47477227258141,"sku":"SSO-SHEDPH50","price":615.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar-50-EDPH.jpg?v=1705688038"},{"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\/en-us\/collections\/sharpstar-edph-triplet-apo-refractors.oembed","provider":"David Astro","version":"1.0","type":"link"}