hmmm i am getting a bit confused here! Marc is saying its usual for QHYs, where others are saying there might be some issue with the CCD or there is a possible light leak.
My dark shows the same pattern. So i thought may be light leak and let me try bias because surely bias cant have light leak. I was wrong same issue (see attached). Then i tried quite a few things like placing the ccd in total dark, changing angle, changing cap...etc etc but its always the same pattern.
So is there an issue I mean does your QHY8 behave the same way? I thought i would just clarify my doubt in the forum first.
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