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Thanks Raymo,
Probably wrong terminology being used... I think I have misrepresented the chromatic aberration with the term Coma. The elongation could be a little star trailing combined with a not so perpendicular camera orientation. I'll look into it, not sure how to verify but will read up.
I do use that method to focus but it is so easy to be off when seeing is not very steady. Will give it another go when I get back from New Zealand in 3 weeks.
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