Bias and CMOS

Forums Variable Stars A beginner…. Bias and CMOS

Dr Andrew Smith

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