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I use either 5, 10 or 15 min subs and have made master darks for these but find they are fairly stable. I also have flats (taken at the time) always of 4 secs duration. Take flats and adjust light box with a potentiometer to give what I want with a 4 sec exposure. I have master flat-darks and bias frames All done at -20C. redo them about every 3-6 months.
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