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Hi Mark
Yes you have to shoot your flats and darks at 2 x 2 bin if that is what your lights are. I find the best results are between 20 -23K ADU for flats on this camera when the offset and gain settings are correct. That said I have had a stack of problems producing decent flats in 2 x 2 bin mode with the QHY9 using the old drivers, so much so that I dont bother using bin modes any more shooting everything in 1 x 1 bin. I have not tried to see if the new drivers have corrected this but I am sure Robin (Tandum) will have more to say about it. As for exposure times the QHY9 shutter is very slow and a 1 sec exposure will leave artifacts which cannot be removed. I try to set my illumination to get my flat exposures at about 4 sec in the 20 -23K ADU range. Hope that helps.
Mark
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