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As for the sub length, it all depends on what your camera has for read noise. For my QHY9 optimal exposure time was about 2 hours with 8.5e- read noise. With my newly acquired QHY22 (arrived yesterday) it should be about 35 minutes but I really need to do some calculations tonight as it has a read noise of 4.5-5 e-.
Also have to take pixel size and QE also get taken into account.
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