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Hi Barry
A thing to keep in mind is that the improvement of S/N ratio, if the subs are of equal duration, is proportional to the square root of the number of subs.
eg If your are taking 1min subs and stack four of them then the S/N is equivalent to a continuous shot of 2 minutes. I generally aim at taking at
least 25 subs giving me a S/N improvement of 5.
Cheers Peter
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