Thanks Paul, Greg and Ivo.
I think the green noise reduction is a bit to aggressive too early in processing wiping out the yellow.
The 200mm lens performs well at f5.6 3.2 and 2.8 is coma city. I've not tried in between. But aperture rings are the only solution to the iris spikes. They haven't been in vogue for years - where can they be sourced.
Ivo. StarTools rules supreme again. Looks much better than the original - nice going. I was going to use the SPFfunction to fix all the stars and haven't got around to it yet. I see what you mean about the line in the background - I think it's to do with flats. I've tried DBE and ABE same effect. Looks like a manual DBE after all.
I'm not a very good advertisement for Pixinsight. It's definitely a user problem.
