Upload & Sell: Off
It's curious to me that I have both an ancient 1D2n and 1Ds2, and with all of my lenses, (about a dozen or so), each lens focuses just about perfectly, just about every time. I had a 50D for a while, as well as a 1D3, and had nothing but aggravation with focusing issues (all the same glass) and trying to correct with MA. Wish I could say why this is true, but I know I'm not the only one. Some lenses have been calibrated by Canon service, others not.