Quote:
Originally Posted by Slawomir
 Lee
Maybe linear fit applied before a stretch? Just for fun  |
I'll have a play later and see what I can come up with :-)
Quote:
Originally Posted by Shiraz
maybe a silly question, but assume that you measured SNR on the unstretched data?
with your system, the turnover point on Peter's curves will be at about 5 minute lum subs in reasonably dark sky. For RGB, about 10 minutes.
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Yep, SNR was measured on unstretched data.
I found that of the 5min subs I mentioned before, only two of them were ruined by clouds, the others just had tracking/guiding issues, which means they're usable for SNR comparisons.
I combined 40x1min and 8x5min and found that the former had better SNR. That's not what I expected to see either. Not sure which looked better, I had difficulty eyeballing them. Might post up some samples a bit later.
I'd encourage anyone interested to have a look around on CN. There's people posting samples of DSOs taken with subs as short as 0.1s, just using
heaps (thousands) of subs. This is what caused me to start this experiment.