I haven't used a Nikon digital camera since owning a D100 and D70 and never had problems with back focusing, but since switching to Canon it seems to be a problem had by myself and many others and resolved only by sending in both cameras and lenses for calibration. Is Nikon free of this problem? A search of the archieves didn't bring up anything definitive. With the D200 on the market and improvements to the D2X, I am thinking seriously about switching back. As good as Canon is reliability is more of an issue to me. By the way, I shoot with two Canon 20D's and 16-35/2.8L, 50/1.4 and 70-200/2.8L IS lenses. I hear the same problems exist with the EOS 1DMKIIN cameras. Input please. Thanks.