The AF and Metering buttons

As I've been discussing at length, when you're ready to take a shot, you…frame your shot, and then half- press the shutter button to begin the…autofocus and metering process.…Once the camera has achieved focus, and taken a meter reading, it will beep at…you, and show a little circle in the viewfinder.…At that point, you can then press the shutter button the rest of the way to take your shot.…You can change this behavior with a custom function.…If I go in here to the menus, and go to the Custom Function menu, to the fourth…group, Operation/Others, the very first custom function here is AF and metering buttons.…

This lets me separate the autofocus and metering process, and spread them out…amongst multiple buttons;…the shutter button, the Autofocus ON button, back here, and the Exposure Lock button.…The idea here is that I can separate the metering process from the focusing process.…This can be handy for times when I want to focus in one location, and meter in another.…The way this works is I click to activate this little field here, this number…