Don
I have been watching this thread with interest, thanks for getting it going. I am a little puzzled about your stacking technique. As I understand it when you stack say 10 images, then they are averaged but as the noise is random it gets averaged out giving a better signal to noise ratio. If you stack identical images then there should be no improvement as 10 lots of identical noise added together and divided by 10 gets you back to where you have started. Have I misunderstood what you have done or the process?
I am (rather impationately) waiting for a clear night to have a crack at M42 with a 200mm lens or even 400mm. I am fortunate that I do have a drive.
Dave
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