Title: Not sharp!
Product review: Was optimistic that despite other reviews about having to exchange the lens due to sharpness and that a friend of mine has a very sharp copy, I went ahead and ordered it. My first lens was extremely blurry closed down and wide open. I got a second one to find it was reasonably sharp wide open but once again blurry from f11 on up. Tried for a third one and was told by Amazon you can only return twice. Waited for my refund and I am trying again only because I know it is possible to get a good one, it's way cheaper than a Canon and hoping it's worth the pain in the .....
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