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Nice work Jo. That is looking pretty sweet now. Some stars are blue and have a blue halo and sometimes excessive blue ringed stars is simply chromatic aberrration from the lens. A fine line there. Programs like Adobe Lightroom have chromatic aberration tools that get rid of blue/magenta rings very well indeed. There is also a plug in from Noel Carboni that does this as well. Often widefield lenses tend to be a little low quality and CA (chromatic aberration) often rears its head especially wide open where CA tends to be worst in most lenses. Something to keep in mind. I think there is a small amount of CA in this image but not a lot. I would expect a bluish tinge to the stars on the left as you have shown (most galaxy images show the spiral arms to be bluish and our MW is no exception). A few around the Rho area may be bue stars accentuated by CA (it can look similar). Additionally, I notice Canon DSLRs tend to be quite blue in their response - perhaps a quality of the sensor or the white balance engine.
Greg.
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