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Interesting thread.
One related question I have is how do you know what an acceptable SNR is?
From Rays analysis I understand how to calculate a target ADU for a single sub based on a system and also what the most efficient exposure length for say an ASI1600 but without a target SNR in mind for a stacked image how would you plan for the number of exposures needed?
Or is it just a case of keeping on going until you are happy?
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