Title: A bad copy. Unusable at 2.8f
Product review: Like some of the other reviews here, my copy was a bad one and I had to return it. Completely useless at 2.8f. Strangely enough, all the problems suddenly goes away and the lens tunrs tack sharp at f4. I bought this lens after I tried one of my friend's copy which had good sharpness at wide open through entire zoom range. I know this particular lens had same wide open sharpness problem during early production and was hence recalled in some counties like Korea and Japan. It makes me wonder whether we are receiving those recalled product or I was just unlucky with my copy.
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