I agree with Paul, I would have expected it to be a lot smoother after that much data.. especially with most subs taken at ISO400. Sometimes I've noticed ICNR (on nikons) to introduce some noise, and have usually found using post processing noise reduction techniques to be much more effective.
Overall though, Its a good image, you've definitely caught that nebulosity, and the mount tracking/alignment seems to have been very good..
Keep em coming!
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