Quote:
Originally Posted by Merlin66
Ray,
WIKI repeats the theoretical methodology....
Do programs like Nebulosity/ Maxim etc actually give a SNR for a nominated area??
I'm just interested as AP's seems to take this into acount in their analysis but I haven't seen the data.....
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Neb gives mean and SD, so yes it provides SNR for a flat image. The only object I know of that can be used to get an estimate of SNR in a real image is Helix - parts of that are very flat. Or you could use a bit of featureless sky background if you can find one. Otherwise, it is only reasonable to measure system SNR with controlled images.