Quote:
Originally Posted by alocky
Signal to noise ratio (where the noise is random and non-stationary) is improved by the square root of the number of stacks. So stacking 9 subs only gives you a threefold improvement in signal to noise. There is a law of diminishing returns with stacking, eventually you reach the point where it doesn't really improve things much.
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All true, but the improvement in S/N comes from the additional exposure time not the stacking process itself. If you do a 10 minute exposure and a 90 minute exposure then the improvement in S/N in the longer exposure relative to the short one will also be three times, the same as if you stack nine 10 minute exposures.
Fun stuff, eh?
