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Thanks very much all for the positive comments, much appreciated.
I keep wanting more RGB data but not getting there before the cloud rolls in or I need to go to sleep. I think perhaps I will drop my ratio from 3:1:1:1 to 2:1:1:1 and get more in that way.
I would like more contrast in the colour range, and I'm guessing that would come if I had more colour data?
I discovered when I packed up last night (after submitting this post) that cloud had rolled in and covered most of the sky. My guide star was fluctuating a bit but I didn't think to go outside and look. I wonder how much of the night I was looking through cloud! I think the guide star started fluctuating about half way through the night.
Jase, I'm keen to hear more about median and sigma clipping vs just averaging. I only use average and add. Sometimes I add ever second exposure and then average the result of that. Should I be doing something different (median?) for colour frames vs luminance frames for best results? (assuming I have enough data)
Roger.
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