I've been doing A LOT of reading about the AF fine tune feature of the D3 lately. However, I feel that trying to set it up for various lenses is quite confusing. I know there is a setting for lenses with and without TCs attached. I also saw a video in which, at the end, it says that AF fine tune isn't necessary with AF-S lenses. This can't be correct, as I can't seem to figure out why an AF-S lens can't be subject to back focus. This became quite apparent this weekend while shooting a dog agility show. I was using the D3 with my 300 2.8 and the combo would consistently focus on the marker cones near the obstacle instead ot the obstacle itself. This was when the focus was set on dead center of the obstacle. I was pretty shocked as I haven't noticed this before. Are the available charts reliable? Also, if you fine tune the lens, will it be consistent from minimum focusing distance and infinity? I wish Nikon's user manual explained this better. For a feature that can impact photo quality such as this, it seems that Nikon really dropped the ball in their manual. I know I can buy a third party manual, but it seems silly to do whan buying such a camera. Oh wait....we did get "free" NX with it. Then they introduced the new version which you had to pay for. Any thoughts? Have you been successful calibrating your D3? Comments?