gammerpc What are the specifications when running in ASP-C Mode:
Pixel Size:
Resolution:
Are the Gain Settings the same 0 or 100?
Assuming you mean APS-C instead of ASP-C...
Pixel size is the same of course. APS-C mode merely crops a smaller ROI from the full frame sensor to send to the USB port of the camera.
The size ZWO has chosen for the smaller ROI had changed from time to time. Since you are using ASIAIR, with APS-C ROI selected in the Main Camera settings, simply look at the bottom left corner of the Preview screen. The current horizontal and vertical sizes is given there. If/when ZWO changes their mind again, you will need to redo your calibration files.
Since it is just a cropped version of the full frame sensor, the gain characteristics remain the same. HCG still happens when you select a gain of 10 dB or more (ZWO gain of 100).
Chen
