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Hi Brett,
I do darks for each sub-length I am liable to use, in my case 1,2,5,10 and 15 mins.
Signal to Noise improves by the square root of the number of subs taken, the number of dark subs I use is 37. As darks are a median stack I always use an odd number of subs, so the middle number is easier to calculate.
Cheers
Bill
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