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Thanks guys, it looks weird to me. Bottom left of frame the stars looked like they streaked or drifted in, Top left of frame the stars look like the drifted down and might be out of collimination / focus (but to only half the shift of the bottom left). You are correct in the middle of the frame there is some image shift slanting upwards.
So for some reason - there does appear to be a tracking issue with this shot (possibly with less than perfect collimination and focus too).
Will coma appear on even shorter shots - say 60 seconds snap of Omega Centauri - just to check I really have no coma and its all tracking. focus and/or collimination to address?
yes that was a full frame - reduced to 1024 * 768 to upload easily!
Huge thanks all,
Matthew
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