{"product_id":"qhyccd-qhyoag-l-pro","title":"QHYCCD QHYOAG-L Pro Off-Axis Guider","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eLarge 14 x 10mm Prism\u003c\/li\u003e\n\u003cli\u003eOnly 12mm of Back Focus Used\u003c\/li\u003e\n\u003cli\u003eFor Full Frame \u0026amp; Medium Format Sensors\u003c\/li\u003e\n\u003cli\u003eM62 and M54 Telescope Interfaces\u003c\/li\u003e\n\u003cli\u003e1.25-inch Helical Focuser with Lock\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-L Pro Off-Axis Guider\u003c\/h2\u003e\n\u003cp\u003eThe QHYCCD QHYOAG-L Pro solves the challenge of finding guide stars in long-focal-length systems by using an oversized 14 x 10mm prism to fully illuminate large-format guide sensors. Occupying just 12mm of back focus, it is built for imagers using full frame and medium format CMOS sensors. The OAG-L Pro offers M62\/0.75 or M54\/0.75 telescope interfaces (with the included spacers) and a precise 1.25-inch helical focuser, creating a solid connection between your telescope, 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\u003eThe 14 x 10mm Prism: Illuminating Large Guide Sensors\u003c\/h3\u003e\n\u003cp\u003eAt long focal lengths, the field of view shrinks, making guide stars scarce. The solution is a guide camera with a larger sensor, but standard off-axis guiders with small prisms can cause severe vignetting, losing the advantage. The QHYOAG-L Pro incorporates a large 14 x 10mm prism, significantly bigger than typical 8x8mm prisms, to direct ample light to guide cameras with large sensors like the QHY5III174M.\u003c\/p\u003e\n\u003cp\u003eThis ensures you can leverage the full field of your guide sensor to find a suitable star, even in sparse star fields. While a small amount of darkening may occur at the very edges, it does not impact guiding performance.\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, 12mm Profile for QHY Filter Wheel Integration\u003c\/h3\u003e\n\u003cp\u003eDifferential flexure between the guide scope and main telescope is a primary source of guiding errors. An OAG avoids it by using the same light path for both imaging and guiding. The QHYOAG-L Pro achieves this in a slim profile that uses only 12mm of precious back focus.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Connection:\u003c\/strong\u003e The body features six 3mm through-holes designed for a direct, bolted connection to QHY filter wheels, giving a solid, parallel and reliable connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e It connects directly to the QHYCFW3XL filter wheel. An included adapter also provides solid connections for the QHYCFW3L and QHYCFW3M.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Interfaces:\u003c\/strong\u003e The included 5mm M62 spacer and 5mm M62-to-M54 spacer let you finish the telescope side in M62 or M54 threads.\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\u003e1.25\" Helical Focusing and Prism Positioning\u003c\/h3\u003e\n\u003cp\u003eAchieving perfect focus with your guide camera is critical for tight, round stars. The QHYOAG-L Pro is equipped with a 1.25-inch helical focuser that allows for fine, precise adjustments to match the guide camera's focus to your main imaging camera. A lock knob secures the focuser once set, preventing any drift during an imaging session.\u003c\/p\u003e\n\u003cp\u003eThe prism itself is also adjustable. A side-mounted locking knob allows you to slide the prism stalk in or out of the main light path. If the prism shows in your main camera's image, move it further away from the sensor until it no longer obstructs it.\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-L Pro vs. OAG-M Pro: Choosing for Your Sensor Size\u003c\/h3\u003e\n\u003cp\u003eQHY offers two \"Pro\" models to match different imaging setups. Both share the same 14 x 10mm prism and 12mm thickness; their interfaces differ.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQHYOAG-L Pro (This Model):\u003c\/strong\u003e Designed for larger setups. It is the ideal choice for full frame and medium format sensors like the QHY600 or QHY461, pairing perfectly with the large-format QHYCFW3XL filter wheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQHYOAG-M Pro:\u003c\/strong\u003e M54 telescope side, made for full frame and APS-C cameras with the QHYCFW3L or QHYCFW3M filter wheels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the QHYOAG-L Pro's large 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 prevents vignetting on guide cameras with large sensors (like the QHY5III174M). This allows you to take full advantage of the guide camera's wide field of view to find a suitable guide star, which is especially critical when imaging at long focal lengths where stars are more sparse.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm using a long focal length SCT with a full-frame QHY600 camera. Is the QHYOAG-L Pro the right choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The QHYOAG-L Pro is designed specifically for this type of setup. Its large prism ensures your guide camera is well-illuminated despite the narrow field of view of the SCT, and its six-screw mounting gives a solid connection to the filter wheel and camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the guide camera with the QHYOAG-L Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe QHYOAG-L Pro features a \u003cstrong\u003e1.25-inch helical focuser\u003c\/strong\u003e. First, achieve focus with your main imaging camera. Then, loosen the lock knob on the OAG's focuser and rotate the focusing ring until the stars in your guide camera are sharp. Once focused, tighten the lock knob to secure the position for the rest of your imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I position the prism to avoid shadowing my medium format sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLoosen the prism position locking knob on the side of the OAG body. While viewing a test image from your main camera, carefully slide the prism stalk outwards, away from the center of the light path, just until its shadow disappears from the corner of your frame. Then, re-tighten the knob. This maximizes the light reaching the guide camera without interfering with your primary image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the QHYOAG-L Pro connect to my QHYCFW3L filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While the QHYOAG-L Pro connects directly to the larger QHYCFW3XL, it comes with a dedicated \u003cstrong\u003eadapter for the QHYCFW3L and QHYCFW3M filter wheels\u003c\/strong\u003e included in the box. \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much back focus does the QHYOAG-L Pro use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main body of the QHYOAG-L Pro consumes only \u003cstrong\u003e12mm of back focus\u003c\/strong\u003e. This does not include the thickness of any adapters used on the telescope side, which must be accounted for separately in your calculations.\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 Used\u003c\/td\u003e\n\u003ctd\u003e12mm (excluding adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable Sensor Size\u003c\/td\u003e\n\u003ctd\u003eFull frame and medium format CMOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Interface\u003c\/td\u003e\n\u003ctd\u003eM62\/0.75 or M54\/0.75 (with the matching 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\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eSix 3mm through holes for QHYCFW3 filter wheels and adapter rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Filter Wheels\u003c\/td\u003e\n\u003ctd\u003eQHYCFW3XL directly; QHYCFW3L and QHYCFW3M with the included adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Guide Camera\u003c\/td\u003e\n\u003ctd\u003eLarge-sensor guide cameras such as the QHY5III174M; smaller cameras also compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eAbout 165g\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-L 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 M62 to 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\"\u003e5mm M62 (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\"\u003eAdapter for QHYCFW3L and QHYCFW3M\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\"\u003eM3x6mm screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 5\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\"\u003eM3x20mm screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 5\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\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":52942980776221,"sku":"QHY-110171","price":280.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/qhyccd-qhyoag-l-pro-1.jpg?v=1794617834","url":"https:\/\/davidastro.com\/en-int\/products\/qhyccd-qhyoag-l-pro","provider":"David Astro","version":"1.0","type":"link"}