Bias and CMOS

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#583377
Andrew Smith
Participant

If you have a CMOS camera be aware it has two possible problems with bias frames.  First, amp glow is not linear with time. Two CMOS can have different readout modes for very short exposures such that extrapolating “long” dark frames of different lengths back to zero time does not give the same value as a “short” bias frame.

Regards Andrew