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Great. I assume that darks should match the subs in terms of number , temperature, length and ISO (so could be done whenever at the right temperature). If understand what you're saying is that flats should be taken in the same conditions, with the same ISO and a similar number, but duration is irrelevant? I was thinking of using a white iPad screen perhaps for flats? Bias I have no idea about bit assume this is also about the state of the camera in the conditions the subs were taken in?
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