QHY OAG-L Large Pro Off-Axis Guider - M62 - 110171

The QHY OAG-L Pro at a Glance:

• Prism Size:  14*10mm
• Telescope Interface:  M62*0.75 or M54 with adapter
• Thickness:  12 mm excluding adapter
• Compatible Filter Wheel:  QHY CFW3XL or CFWM/CFWL with included adapter

The OAG-L Pro from QHY is designed with a large 10mm x 14 mm prism (as opposed to 8x8 for the standard QHYOAG series), which accommodates guide cameras with larger sensors, such as the QHY 5III174M or 5III585C.  This upgrade will allow you to choose from more stars when picking a guide star, and will avoid severe vignetting due to the wider prism.

The OAG-L Pro attaches directly to the camera or filter wheel with six screws, ensuring a solid, parallel and reliable mechanical connection. At the same time, various standard and optional QHY accessories can be used to realize a variety of structural combinations. 

Specifications:

Telescope Interface:  M62*0.75 or M54/0.75 (when combined with appropriate adapters)

Focal Length:  12 mm, excluding adapters

Suitable Imaging Cameras:  Full Frame & Medium Frame

Compatible Filter Wheel:  CFW3XL & CFW3M/L (combined with appropriate adapters

Compatible Guide Camera:  Large-sensor guide cameras are recommended, but is also compatible with smaller cameras for ultimate flexibility

Guide Camera Interface:  1.25"

Weight:  About 165g

Brief User Guide & Additional Info

Before using, please remove the protective film attached to the prism.

The OAG body has six holes with a diameter of 3mm.  These holes are used for connecting various adapter rings or the QHYCFW3 filter wheel.

The OAG includes a prism position adjustment locking knob located on the side of the body. When this knob is loosened, the position of the prism can be adjusted. Adjust the prism’s position carefully to ensure it doesn’t obstruct the chip. If you find any obstruction in the corresponding position of the captured image, move the prism further away from the chip.

The OAG features a helical focusing seat, allowing for fine adjustments to the camera’s focal plane. On the focusing seat, there’s a focal plane position locking knob. When adjusting the focus, please release this knob. Once the focal length is adjusted, lock this knob. Do not forcibly rotate the focusing ring when it’s locked, to prevent damage to the internal structure. Once locked, you’ll notice that the focusing ring can still move slightly left or right. This is normal, and at this point, the camera is locked, and the focus won’t change.

The OAG can be used in conjunction with a guiding camera. It’s important to ensure that the distance from the prism’s surface to the guiding camera is equal to the distance between the prism’s surface and the imaging CCD. If the guiding camera is still not in focus at its limit distance, you can remove the front end of the guiding camera to further shorten the distance.