Thanks Russ, yea I was thinking the more cropped one did look a little noisy. That's why to some extent the more zoomed out version is better. It doesn't enhance that noise as much. I was hoping to get at least 2.5 hours on this nebula but the clouds ruined the night.
The 550d was unmodified. I have a modified 600d but I find a lot of the nebulas are just too red. I wanted to try and capture some of the different colours in this nebula rather than having a washed out red nebula.
Tom
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