I was trying to photograph bicycles passing in front of me about 15 feet away. The AF is clearly not fast enough to focus on a bicycle and take the picture before the bike left the frame. I thought I would prefocus. I successfully focused (using AF) on a bike, then I turned the camera over in order lock focus by changing it to MF. When I did that, the camera focused on my foot. Huh??? I didn't press the shutter, it just refocused by itself. I Googled. Yes, the camera is supposed to do that and there is no way to turn it off. Ok, one option is assign MF/AF to the custom button and change the camera to MF before it has a chance to refocus. Can DMF also help in this situation? What is DMF anyway? Here is what the alpha book says: "After focusing automatically, make fine focus adjustment manually (Direct Manual Focus)." Nice, but what does that mean?