Quote:
Originally Posted by gregbradley
Not sure about that technically. Why would you subtract a master bias from a master dark? The master dark already has the master bias component in it and you would want that when you subtract it from your light as the light would have the white edge in it.
As I understand it bias are more for flats unless you want to scale your darks which is handy at times.
Greg.
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Just an experiment to isolate the cause Greg, nothing about image calibration.
If it disappears after bias subtraction, it's read noise associated. Any remaining, would likely be as a result of a number of factors. amp, temp variance across the ccd etc and would build over time.
I don't use a Sony sensor, but even if I did, I would calibrate with bias, darks, and flats regardless.