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You can see the elongation without magnifying the image, so not
enlarging it wouldn't help Kevin. I've had a look at a single frame
of mine of The Sprinter that I took with my 8" f/5, and the stars around the centre are still round at 175%. I'm not engaging in gratuitous criticism; I always welcome comments on my output, good or bad.
I did think that it could have been caused by wind, but the outer stars
are not elongated in the appropriate direction. It's actually getting a bit odd, because the outer stars are only elongated in the direction dictated by coma. So, if the outer stars show no sign of tracking error, why are the central stars not round?
raymo
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