This is for users who own cameras that allow them to separate autofocusing from their shutter release. In other words, when you press the shutter release button halfway down - this doesn't autofocus, but instead, autofocus is set elsewhere on your camera. On my D2X, there's an AF-ON button and you can set it so that the camera only focuses when you press AF-ON, instead of allowing the camera to autofocus with the shutter release button (or both). My question is: what are the advantages/disadvantages to this setup? I'd like to hear why people disable AF on their shutter release button when taking photographs.