Well..I was messing around with face-detection and focus tracking and I must say, that focus tracking is impressive. I tried to fool it and move around and be a bit "haphazard" and it nailed focus every time...and faster than a "focus recompose" approach too. I think I'm going to try and use this more often. Just FYI you use it by being in AF mode "center" or "multi" but NOT "multi-that-I-can-move-the-point-around" mode (that makes sense...why would you need to?) Then you put the subject in the center of the frame, push the center button on the wheel, and a small box appears...push it again and it locks onto your target. Now wherever you recompose, that target is the "focus point" and when you "half press" that's the "go green" box area. Give it a try!