{"product_id":"qhyccd-qhyoag-m-pro","title":"QHYCCD QHYOAG-M Pro Off-Axis Guider","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eLarge 14 x 10mm prism fully illuminates large-sensor guide cameras\u003c\/li\u003e\n\u003cli\u003eConsumes only 12mm of back focus (excluding adapters)\u003c\/li\u003e\n\u003cli\u003eFeatures a 1.25-inch helical focuser with a locking knob for precise focus\u003c\/li\u003e\n\u003cli\u003eConnects directly to QHYCFW3L\/M filter wheels via six 3mm mounting holes\u003c\/li\u003e\n\u003cli\u003eLightweight design at approximately 155g\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\u003eQHYCCD QHYOAG-M Pro Off-Axis Guider\u003c\/h2\u003e\n\u003cp\u003eThe QHYCCD QHYOAG-M Pro solves the challenge of finding guide stars in long focal length systems by using a large 14 x 10mm prism to intercept light from your main optical path. This off-axis guider consumes only 12mm of back focus and connects directly to QHY filter wheels with six 3mm through holes for a solid, parallel connection, and weighs about 155g. By sharing the same optics as your main camera, the QHYOAG-M Pro eliminates the differential flexure that can ruin long exposures when using a separate guide scope.\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 14 x 10mm Prism for Large Guide Sensors\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the OAG-M Pro is an oversized 14 x 10mm prism, designed to fully illuminate the large sensors found on modern guide cameras like the QHY5III174M. This large clear aperture captures a wider patch of sky, dramatically increasing the number of available guide stars compared to OAGs with smaller prisms. This is especially critical in long focal length systems where the field of view is narrow and stars are sparse.\u003c\/p\u003e\n\u003cp\u003eBy providing an unvignetted field for your guide camera, the OAG-M Pro ensures you can leverage the full sensitivity and field of view of your guide sensor. The result is a better chance of finding a usable guide star at long focal lengths.\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\u003eRigid, Thin Profile: 12mm Back Focus \u0026amp; 6-Screw Mounting\u003c\/h3\u003e\n\u003cp\u003eEngineered for stability and minimal impact on your imaging train, the QHYOAG-M Pro has a slim body that uses only 12mm of back focus. This thin profile preserves precious back focus for use with filter wheels and other accessories. The telescope side uses M54\/0.75 with the matching adapter; a 5mm M54 spacer is included.\u003c\/p\u003e\n\u003cp\u003eFor a completely rigid connection, the OAG-M Pro attaches directly to QHYCFW3L and QHYCFW3M filter wheels using a pattern of six 3mm through holes. This screwed connection gives a solid, parallel and reliable mechanical link between the guider, filter wheel and camera.\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\u003eQHYOAG-M Pro vs. Standard OAGs: Finding Guide Stars at Long Focal Lengths\u003c\/h3\u003e\n\u003cp\u003eThe primary advantage of the QHYOAG-M Pro over previous generations of off-axis guiders is its prism size. Many standard OAGs use a prism around 8x8mm, which can cause significant vignetting on guide cameras with larger sensors. When using a camera like the QHY5III174M with a small-prism OAG, the corners of the sensor are starved for light, effectively reducing your field of view and limiting your guide star options.\u003c\/p\u003e\n\u003cp\u003eThe OAG-M Pro's 14 x 10mm prism solves this problem by delivering a much larger illuminated field. In the same optical system, the difference is immediately apparent: where a smaller prism would produce a heavily vignetted image, the OAG-M Pro provides a bright, usable field across the entire guide sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Focus: 1.25-inch Helical Focuser with Lock\u003c\/h3\u003e\n\u003cp\u003eAchieving sharp focus with your guide camera is critical for accurate guiding. The QHYOAG-M Pro incorporates a 1.25-inch helical focuser that allows for fine, smooth focus adjustments. Once you've achieved a sharp star profile, a locking knob secures the focuser in place, preventing any drift during an imaging session.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrism Position Adjustment:\u003c\/strong\u003e A side-mounted locking knob allows you to adjust the prism's stalk position. If the prism shows in your main camera's image, loosen the knob and move the prism further away from the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal Setup:\u003c\/strong\u003e To achieve focus, the distance from the prism to the guide camera sensor must equal the distance from the prism to the main imaging sensor. The helical focuser's range makes it easy to dial in this precise spacing for perfectly parfocal guiding and imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I use the QHYOAG-M Pro instead of a guide scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe QHYOAG-M Pro uses your main telescope's optics for guiding, which completely eliminates \u003cstrong\u003edifferential flexure\u003c\/strong\u003e. This is a common problem where the guide scope and main telescope shift slightly relative to each other due to mechanical stress or temperature changes, causing trailed stars even with perfect guiding. An OAG ensures the guide camera sees the exact same motion as the imaging camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the QHYOAG-M Pro's 14 x 10mm prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe large \u003cstrong\u003e14 x 10mm prism\u003c\/strong\u003e is designed to fully illuminate large-sensor guide cameras (like the recommended QHY5III174M). This provides a wider, unvignetted field of view for the guide camera, making it much easier to find a suitable guide star, especially in long focal-length telescopes where the field is narrow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an f\/10 SCT and struggle to find guide stars. Will the QHYOAG-M Pro help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. An f\/10 SCT has a very narrow field of view, which is exactly the scenario the QHYOAG-M Pro is designed for. When paired with a large-sensor guide camera, its 14 x 10mm prism maximizes your chances of finding a bright guide star within the small patch of sky picked off by the prism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect the QHYOAG-M Pro to my QHYCFW3M filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe QHYOAG-M Pro is designed for a direct, rigid connection. You use the included \u003cstrong\u003eM3 screws\u003c\/strong\u003e through the six 3mm holes to attach the OAG directly to the front plate of the QHYCFW3M or QHYCFW3L filter wheel. This gives a solid, parallel connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus my guide camera with the QHYOAG-M Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, achieve rough focus with your main imaging camera. Then, insert your guide camera into the \u003cstrong\u003e1.25-inch helical focuser\u003c\/strong\u003e on the OAG. Loosen the focuser's lock knob and rotate the focuser barrel until the stars are sharp in your guiding software. Once focused, tighten the lock knob to secure it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the QHYOAG-M Pro's prism cast a shadow on my APS-C sensor when imaging the Triangulum Galaxy (M33)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's unlikely if adjusted correctly. The QHYOAG-M Pro has a prism position adjustment screw. You can retract the prism stalk just enough so that it picks off light from the edge of the light cone without physically intruding into the path of your APS-C or full-frame sensor. It's always best to take a flat frame to confirm there is no shadow before starting a long imaging session.\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\u003ePrism Size\u003c\/td\u003e\n\u003ctd\u003e14 x 10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Consumed\u003c\/td\u003e\n\u003ctd\u003e12mm (excluding adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Interface\u003c\/td\u003e\n\u003ctd\u003eM54\/0.75 (with adapters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuide Camera Interface\u003c\/td\u003e\n\u003ctd\u003e1.25 inch, helical focuser with focus lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable Main Sensor Size\u003c\/td\u003e\n\u003ctd\u003eFull frame and APS-C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Filter Wheels\u003c\/td\u003e\n\u003ctd\u003eQHYCFW3L and QHYCFW3M (with adapters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Guide Camera\u003c\/td\u003e\n\u003ctd\u003eLarge-sensor guide cameras (e.g., QHY5III174M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Interface\u003c\/td\u003e\n\u003ctd\u003eSix 3mm through holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eAbout 155g\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\"\u003eQHYOAG-M Pro\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e5mm M54 (female) spacer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM3x18mm screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 8\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\"\u003eM3x10mm thumb screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\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\"\u003e1mm hex key\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/QHYCCD_OAG-M_Pro_and_OAG-L_Pro_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/qhyccd-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eQHYCCD 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"QHYCCD","offers":[{"title":"Default Title","offer_id":52942980383005,"sku":"QHY-110186","price":321.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/qhyccd-qhyoag-m-pro-1.jpg?v=1794617834","url":"https:\/\/davidastro.com\/products\/qhyccd-qhyoag-m-pro","provider":"David Astro","version":"1.0","type":"link"}