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Originally Posted by jase
Marc,
You mention you're friends refractor - what was it? Was it a achromat by any chance? At a quick glance it looks like a chromatic aberration issue. Potentially compounded by soft focus.
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Can't honestly remember what it was. I think he uses it for autoguiding only.
Yeah I had a feeling it was focus. I'm focusing eyeballing the back screen of the camera right now so it is a bit dodgy hey  Got to work on a better method.
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The weird shaped stars around the edge look like a field rotation problem due to inaccurate polar alignment. You can see them rotate in a small arc.
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I have a feeling it's my lens adaptor to fit the camera. I was zoomed out to the max and at the limit of vignetting so it could well be me again there. My mate was in the middle of doing 60 or so star alignment to better his polar alignment on his TAK EM-200 and I believe it must have been spot on by the time I jumped in to take a couple of shots.
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You'll need much greater data for the Selective Contrast Masking (highpass filter) to work. Focus on achieving good polar alignment and sharp focus first, then progress from there.
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I'll keep all that in mind next time I try it. Thanks for the feedback Jase.