Just in case
Sounds like you have a lot of good advice here, but just in case, try the lens on another camera if you can. This will rule out if there is a problem with the lens. I doubt it, but just rule it out. I once had a lens that I was having problems with and it took me taking it back to the store and trying it out on other cameras to find that the lens was the problem.
Good Luck
JM
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Capturing Moments In Time
D700, Nikonos, Hasselblads
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