Canon 300 HS - Manual (Page 86)

86
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.
∆ Keep the shutter button pressed halfway
and press the
q button.
The focus locks and % appears on the
screen.
∆ If you release your finger from the shutter
button and press the
q button, % will
disappear and the focus will unlock.
Compose the scene and shoot.
While the shutter button is pressed halfway, the focus and exposure will
continue to adjust, allowing you to take pictures of moving subjects without
missing a shot.
Choose [Servo AF].
∆ Press the n button and choose
[Servo AF] from the 4 tab, and press the
qr buttons to choose [On].
Focus.
∆ The focus and exposure will be maintained
where the blue AF frame appears while
you press the shutter button halfway.
Shooting with the AF Lock
Shooting with Servo AF