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Title: Weird focus problem
Review: It's possible that just the copy they have shipped to me is bad!Problem#1: my copy is too soft at f2.8 to be accepted for most of the focal length range. It gets much worse at the tele end. Stopped down to f3.5 improves only a little.Problem#2: very often it just cannot focus correctly! It seems to me my copy has some front focus problem. I have a canon 60d with the 18-135 kit lens. My kit lens is tack sharp in the center and sometimes a little softer at the left area of the pictures. And the 18-135 I have always focuses accurately and never had any focus problem.I will return it.
