Quote:
Originally Posted by Paul Haese
This is a very dim object. I took over 15 hours of data on M78 and it still contained noise which I had to smooth out. I was taking 20 minute subs in the Luminence and that should have been something like 30 minutes or even 40 minutes. 16 minutes will show the brighter regions but not the darker areas. Stretching will always bring out the noise. Longer subs will help you.
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However, you can still get a pretty decent pic with shorter exposures and less time. This one was 10min exposures over 3 hours with a 4" refractor, so I think the OP has more issues than just his exposure time of 3.6hrs.
http://www.astrobin.com/27709/
and yes, there is a lot of noise.
Geoff