Canon IXUS 310 HS - Manual (Page 99)

99
The focus can be locked. After locking the focus, the focal distance will not
change even when you release your finger from the shutter button.
Lock the focus.
z Keep the shutter button pressed halfway
and touch inside the frame shown on the
left.
X The focus locks and % appears on the
screen.
z If you release your finger from the shutter
button and touch the screen again, AF lock
will cancel, and
% will disappear.
Compose the scene and shoot.
Shooting with the AF Lock