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Paul,
I can see a little "trailing", except in the centre which you say is Saturn.
I wonder if it is coma.
I will sound like an old fogey, or a snob, or both, but I would be more inclined to try a decent fixed focal length lens. If you have an EOS try finding a cheap 50mm fixed EF lens. I have always shunned the zooms, but have had reasonable success with the likes of the Nikkor 80-200ED, and also the EF70-210 Canon. BUT these are very expensive pieces of glass.
Any more shots?
Gary
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