The new large QHYCCD off-axis guider PRO is designed for QHY cameras with and 36x24mm sensors with direct connection to the camera or filter wheel. This Pro version has a larger prism than the original version at 14 x 10mm, making it ideal for guide cameras with large sensors such as the IMX174. Precision Connection The main purpose of the off-axis guider (OAG) is to use the same optical path as the main camera when guiding during astrophotography. Using an OAG avoids the problem of differential flexure that can occur when using a separate guide scope. With an OAG, part of the image is picked-off from the edge of the imaging circle which does not block the main CCD. Off-axis guiding provides more accurate guiding and sharper final images. Left: Old version of the QHYOAG with IMX174 sensor. Right: OAG PRO with IMX174 sensor showing much less vignetting. The QHY PRO off-axis guiders have a 14mm x 10mm multi-coated prism that picks off the beam for the guide camera. The position of the prism can be adjusted as needed and locked down. The main camera connects to the OAG with six 3mm screws that ensure connection accuracy and parallelism, providing a reliable and secure mechanical connection. QHY Off-Axis Guider PRO for Medium-size Cameras and Filter Wheels This large version of the QHY OAG LARGE PRO works with QHY's M62 adapters (included with the OAG). It supports cameras such as the as the QHY268M/C and QHY600 series. It also works with the QHYCFW3-M, QHYCFW3-L and QHYCFW3-XL filter wheels. Precise Easy Focusing Each QHY OAG includes a non-rotating helical 1.25" focuser with a 6mm range to help focus an image on your guide camera. When using the QHY5II and QHY5III, the position of these cameras can be further adjusted in the OAG itself to accommodate a wide range of back focus. Specifications Model: QHYOAG-L PRO Telescope connection M62 x 0.75 Maximum free aperture 50 mm Connection screws 6 x M3, 62 mm apart Sensor size compatibility APS-C, APS-H, full-frame Compatible products QHY268C, QHY268M, QHY600; direct connection with screws; QHYCFW3-M, QHYCFW3-L Guide camera interface 1.25" Weight 165 g Optical thickness 11.90 mm without adapters SKU QHY-OAG-L-PRO Note: in order to connect the OAG-L-Pro to your image train, make sure you have the following adapter kits. For use with the QHY268M or QHY600M-PH (short backfocus versions), Combo Kit B1 is required. This is included by default with QHY268M and QHY600M-PH-SBFS cameras newer than mid-2023. For use with the QHY268C or QHY600C-PH (short backfocus versions), Combo Kit G1 is required. This is included by default with QHY268C and QHY600C-PH-SBFS cameras from early 2024 onwards. Items included QHYOAG-L PRO Large 1 x M62 to M54 x 0.75 telescope-side adapter plate with optical thickness of 5mm 1 x M62 spacer with optical thickness of 5mm 1 x adapter for QHYCFWL filter wheel 5 x M3 x 6mm screws 8 x M3 x 18mm screws 5 x M3 x 20mm screws 3 x M3 x 10mm thumb screws and hexagon key Downloads QHYOAG Pro information
