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Because all your subs being identical, stacking will not increase your signal to noise ratio which is how data rejection algorithms work. The only thing common between subs in a stack is the signal (stars and nebs). The difference is the noise, read-out, background, hot pixels (providing you dither), etc...If you stack the same sub you'll increase the signal and the noise equally and the algo won't reject anything.
Last edited by multiweb; 21-08-2011 at 10:53 AM.
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