Quote:
Originally Posted by RickS
The diminishing returns are related to the total exposure, not the number of subs (at least so long as your subs are long enough to make read noise insignificant).
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So you think that the 21st sub will give the same noise reduction as the third? Personally regardless of the maths, top photographers are getting better results from longer subs and that is enough for me.
The table here shows clearly how each subexposure gives you a lower and lower snr gain regardless of sub length.
http://starizona.com/acb/ccd/advimagingdetail.aspx