Quote:
Originally Posted by Merlin66
You need more exposure. The shot noise varies as the square root of the total ADU; the bigger the signal, the lower the noise.
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So longer integration times rather than higher binning is the way to go
I had suspected as much. For some reason I had thought that binning could be substituted for longer subs.
Thanks for the tip - looks like I need to g out to 5 minutes to beat the noise down some more.
Pete