Very disappointed with this lens; After hearing so many raves, I saved up for it just to get [what I think/hope] a lemon. The product does not focus; it will hunt for a long time and then focus gently. It was sharp 1 out of 100 shots. For a wedding photographer, that was unacceptable to me. I've heard of "sigma lottery" meaning it's common and sometimes you have to buy a pair and return before you can get one with a sharp focus but I'm not willing to pay multiple shipping costs and such to spend a lot. a lot of time to get a working product. When you pay close to a thousand dollars for something, you usually expect it to work right the first time.
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