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There has been quite a lot of testing done over on CN and bias frames for the ASI1600 have generally been considered to cause issues. Bias frames are great with CCDs for dark scaling as you can get a true dark frame but the issue is that most CMOS sensors don’t have a linear dark current progression like CCDs do. This gets even worse when amp glow is thrown in as that’s even further from being linear.
A good dark frame is a true representation of the time integrated bias (bias + dark current).
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