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I just wanted to know how I can calibrate the AF of my Canon 24-70L when mounted on a Canon 60D. Since there is no AFMA in the 60D does that mean my only resolution is to send it to Canon and have them take a look at it? Also, I dont know if its really an AF issue, it's known to be soft at f2.8 but when set to f5.6 or above it starts to become sharper but still not quite as sharp as I was hoping an expensive lens like this to be. Is this really a known property of this lens? You know, being a little soft.