Quote:
Originally Posted by Shiraz
Marc, the QHY9 is unique in that the user can set both the gain and bias. Suggest that you use a gain of 0, set the offset to get a bias around 1000ADU, measure the Bias and aim for a background ADU of Bias + 2000.
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Cool - will try that. I've always used gain 1. I think because at the time CCD Stack didn't like FITS files with zero gain in the header. Might have changed. Will check it out.