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Hi Jim,
There is not much left in the focus (I've try tweaking a little either side) and can't get any better than this. Perhaps I can reduce the coma a little on the right hand lower side. The other point is the Logarithmic scaling used in these images tends to cause stars to be extended and accentuates star aberations, so I have applied a little bit of unsharp mask to counter this somewhat and uploaded new versions to the same links. What do you think?
Further improvements would come from stopping down a little further. At f4.5 stars are pinpoints at the edges except the lower right where there is a faint short tail on some of the brighter stars when viewed at 100%. Also I have heard the Light pollution and Nebula filters also help.
Terry
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