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Title: Quality Control Problems and very slow focus
Review: The copy I had didn't autofocus correctly, it had a back focusing problem. But even ignoring this, the autofocus was so ridiculously slow it was practically unusable. As someone else said, you could go get a cup of coffee while this thing focused.PROS:- Very sharp, even wide open- Good build qualityCONS:- Unusable autofocus- Quality control issuesIt could be used as a manual focus lens, but for that, there might be cheaper options available.
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