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Rob, your gain setting seems very high. I used the method Doug posted here to set offset and gain on my QHY 9 and came up with gain = 15%, offset = 102. It seems to work for my camera without clipping the data so it might be worth giving it a try. My bias frame has min of 120 ADU and a max of 435 ADU. With the camera pointed straight into a light the max is 65 530 ADU.
Mark
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