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I have the camera at -10C and in broad daylight with the Sun either rising or setting take flats at 200ISO opposite the Sun. I also take darks to get rid of all the inherent noise. Further I take about forty or fifty flats. The exposure are in the range of 1/200 or 1/320 th of a second.
My needs are not normal as I take wide fields.
A hint here is that any flats not taken with exactly the same optic configuration is a waste of time!
Bert
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