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Thanks Peter, nice post! And yes, that's exactly what I had in mind. Unfortunately all of my 5min subs except one got ruined. So I compared 5x1 to 1x5 and then did the 57x1 just for giggles and then I saw something I didn't expect and I thought I'd share that.
My point still remains though: after seeing the images I captured here, do you not even start to question why we optimise for SNR? There's no doubt that when read noise limited longer subs will give you better SNR. But again, looking at those images, do you really care which one has the better SNR? If you did, you'd discard the cleanest of the images due to its inferior SNR.
So while you've measured the relative SNR, I'm not convinced that SNR in itself means much at all in practical application.
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