Quote:
Originally Posted by Shiraz
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The method is designed to provide a single goal ADU value that you can use to set sub exposure length. If you use it, the read noise contribution in the final image will be less than than 5% of the total noise (ie you bury the read noise under the shot noise). ..
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Yes, I get that you are simply looking for a sky limited exposure time. I was simply pondering, given read noise is random, it's effects disappear with more and more read-ups, or more and more subs, with say, everything else being equal.
P.s. "Correct" was a bad choice of words, I was more concerned about how multiple read ups also improve S/N even though one might be exposing for less than a sky limited time.