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Originally Posted by Vermin
I thought using a lower ISO and longer exposure would be the go. That was until I saw Octane's wide field view of Scorpius today.
Maybe it's because most of the noise I've is in the red channel and Octane was using an unmodified camera?
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If you go for longer exposures at lower ISO's you get other problems occuring like amp glow, sky glow etc.
Longer exposures also reveal problems with alignment and tracking. If your not using a good quality mount it will show up in longer exposures.
It also depends on what your shooting through and at what f ratio etc.
Octane was using a relatively wide FOV.
If Octane was to shoot the series at say 4-10 min instead of 30 sec exp you'd see more noise.
The whole Idea of shooting more shorter exp is to increase the sig to noise ratio of the final image. At the same time it allows us to use higher ISO's to grab some detail at the same time.