Quote:
Originally Posted by Poita
I'll try taking 60 one second subs and a 1 minute sub and compare the two.
Also, the longer the shutter is open, the more 'averaging' happens automatically rather than averaging later if you know what I mean.
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This would depend on weather they were summed or averaged - wouldnt a summed image be n times more luminous than the averaged one, n being the number sumed?
The S/N ratio should be the same in both cases - disgregarding read noise.
By combining subs with the mean or median method it reduces random noise, thereby allowing the signal to come through more, but does it raise signal?
Page 568 of "handbook of astronomical image processing" says
...with digital images you can add (or "stack") multiple images together to make one very "deep" image...
This is my very question, can this be done? is it deeper, can it pick up fainter objects, would this differ depending on your combining method? I know it will produce an as clean a picture in terms of random noise but thats not my point.
thanks
Josh