Quote:
Originally Posted by peter_4059
I'm definately subtracting the bias and have tried shorter flat exposures but still get the same result - adding using pixel math is the only thing that has provided a satisfactory result so far. Changing exposure is equivalent to multiplying by a constant (in the linear part of the sensor response which doesn't change the ratio I describe above as all values get scaled by an equal amount.
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Can you post/PM a link to three FITS files? One sub, the master flat and the master bias. I'll play with it and see what's going on.