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Dunk, those are darks right? Shoot some fast bias frames at your low temperature and compare them to some darks shot at your standard duration and your low temperature - once they look the same there is not much to be gained by going colder. You can't get rid of bad pixels with cold ( which is what bias frames are designed to highlight).
I've had been building up a dark library at -5C and stopped when I realised they all pretty much looked the same. Rowland has found the same thing with his.
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