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Interesting galaxy. I don't think I have seen that one before. Very nice.
I don't see a lot of noise. You mean a bit of colour noise in the spiral arms? Blur tool can reduce that, it needs a bit of smoothing in the arms whereas the core could take a bit of sharpening.
With regards to exposure length there is a CCD calc by Wodaski.
My understanding is read noise of the camera will largely determine your ability to choose exposure lengths. In your case though, with a blooming chip, you are limited by blooms which I have never had to deal with but I believe they can be hard to handle.
Your read noise may mean multiple 5 minute images will have more noise in it than half as many 10 minute images. The SBIG camera is pretty noisy by todays standards in that regard. But on the other hand blooms will make your life hard too. So perhaps 5 minutes is the compromise.
Galaxy looks a bit grey, whereas it probably is more bluish with a more yellowish core.
Seeing of 1.8-2.2 is pretty good as far as I can tell from my experience.
Overall a very good image and nice round stars.
Greg.
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