Tap the icon shown in the illustration to choose the operation performed by tapping
the monitor in shooting mode. Choose from the following options:

Touch the monitor to position the focus point
and focus. Focus locks while your finger remains on the monitor; to release the shutter,
lift your finger from the screen.

As above, except that lifting your finger from
the screen does not release the shutter. If subject tracking is active, you can focus
on the current subject by tapping the monitor.

Touch shutter and AF disabled.