The QHYCCD OAGL Pro uses a wider prism than the original QHYCCD OAGL to better accommodate larger sensor guide cameras. The prism size of the standard QHYOAG series is 8 x 8mm, while QHYOAGL Pro is 10 x 14mm.
When using an off-axis guider (OAG), unlike external guiding solutions, the guiding camera and the imaging camera share the field of view of the main optical system. Telescopes with long focal lengths can often have fewer stars suitable for guiding within the field of view, especially under sub-ideal seeing conditions. One way to improve the chance of finding a decent guide star is to use a guide camera with a larger sensor and therefore, larger field of view.
In order for these larger-sensor guide cameras to perform to their full potential in an off-axis guider, a prism large enough to allow illumination of the larger sensor is needed to avoid severe vignetting. And the new QHYCCD OAGL Pro version of the QHY Large Off-Axis Guider is designed to do just this.
The QHY OAG-L Pro attaches directly to the camera or filter wheel with six screws, ensuring a solid mechanical connection. Because the OAGL Pro is designed to support cameras with larger sensors (such as the QHY461PH and QHY600) and optical systems, the Pro only provides M62 and M54 thread outputs.
You can learn more about the QHYCCD OAGL Pro here.
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