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Title: Excellent Value
Review: I have very specific needs for a lens of this focal length for the Canon 1DIIn for which it was purchased. My business does a lot of event and youth sports/school portraiture. For this, the lens has exceeded it price point. Center sharpness and color are a good as any Canon or Nikkor I own.From a purely technical standpoint, when testing the lens, it does show softness at all corners- particularly on the top left. On a 1.3 crop of my Canon, most softness is cleared by f5.6, with the exception of the top left, which never clears. Center sharpness is outstanding down to f2.8 through the focal zoom. In practice, for my applications, no weaknesses are visible. Images are exceedingly sharp.Only those who are more interested in testing than shooting will be dissapointed. In practical use, it is simply an outstanding value.
