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That's not bad Roger. Firstly that is a tough target. Those 2 galaxies are very small and you are imaging at over 2.5 metres. SCT's do tend to give larger star sizes and there would be some chromatic aberration from the corrector plate. But the red halo may be coming from registration being a bit off. I use the CCDstack plug in registration and its highly accurate. Perhaps also the red focus is a tad off or the seeing was worse when you did the red. You could lightly deconvolve the red subs to bring the star sizes in line with the other channels.
I don't think NABG has anything to do with it as that causes blooms which I don't see here.
Greg.
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