Sun 16-Dec-12 03:59 AM | edited Sun 16-Dec-12 03:59 AM by Rmastran
I would add a few steps to this that work well for unattended setups.
Set the camera to continuous shooting (CL). Use a remote switch (such as this one: http://bhpho.to/URQIQm) to lock the shutter.
When the subject enters the focus area, the camera will start firing, and will stop when the subject leaves the focus area. When the subject re-enters the focus area, the camera will automatically start firing again.