Thats not too bad for a zoom I reckon.Jim?.just a little bit of violet/blue CA and not much coma there...much better than you would get if the zoom was a none ed type...Like Terry says, get the focus spot on and stop it it down a stop or two and your pics will be much improved with less CA and tighter stars..keep it up!
Its good to see how these lenses are performing as I am saving for a nice lense!
Cheers Gary
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