Quote:
Originally Posted by RickS
Dunk,
Why not make some measurements on a small area of an image you already have that's just around your level of minimum acceptability for noise. If you can figure out how many photons you need to capture in each pixel to get to that point then you can make inferences about future targets on the basis of a few sample subs.
Hint: previews, the Statistics process and PixelMath will do everything you need along with the understanding that shot noise is n^0.5 if you capture n photons (in a single sub or a whole stack) and SNR is n/n^0.5 = n^0.5. You can ignore other sources of noise so long as you're doing subs that are sky limited (and if you're not you should be!)
Ken might not believe me but I do take a fairly rigorous approach to SNR when I'm chasing very faint features. The jets of NGC 1097 would be a good example.
Cheers,
Rick.
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Will give it a try, thanks Rick
