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if your subs are not sky noise limited, you can get the same result using more overall exposure time to compensate for the extra read noise. the sole driver behind optimising sub exposure is to minimise the time needed to get to a given image quality. you may wish to choose other exposure times - eg to improve dynamic range with shorter subs or because you don't want to risk something screwing up and losing lots of data in long subs..
Last edited by Shiraz; 11-10-2015 at 10:27 AM.
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