[QUOTE=Grumby;519589] My guess is that I'm over simplifying the story, and that the camera is actually identifying the exact focus distance as opposed to the composition of the scene. That being the case, if as you turned away, the camera passed something else at the exact same distance, would it start taking pictures of that too? QUOTE]
The answers are yes and yes.
The camera is locked on a focus distance. When ANYTHING comes into sharp focus after the shutter release is fully depressed, the camera will start to take pictures automatically.
This is best for tracking/panning work IMO.
You can also do the same thing with manual focus, but that relies on your reflexes...best to start shooting just before the subject enters into the DOF.
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