Nice work Steve, I like your framing
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The white star issue seems to plague many DSLR images and I think it is to do with it being easy to over saturating them? You use a one shot color camera yes? These are basically coooled DSLR's as they have the colour matrix over the pixels too. I use a mono CCD so to be honest I am not exactly sure what you should do but more shorter exposures added together might work? What do others think? I am sure there is a good explanation?
Mike