Canon PowerShot S5 IS User Manual page 76

Shooting with the AF Lock
1
Aim the camera so that an object at the
same focal distance as the main subject is
centered in the AF frame.
2
Press the shutter button halfway and press
the MF button.
viewfinder).
3
Re-aim the camera to compose the shot as
desired and shoot.
To Release the AF Lock:
Press the MF button.
The AF lock is convenient because you can let go of the
shutter button to compose the image. Moreover, the AF lock
is still effective after the picture is taken, allowing you to
capture a second image with the same focus.
When shooting with the focus lock or AF lock using the LCD
monitor, setting the AF frame to [Center] (p. 69) makes
shooting easier since the camera focuses using the center
AF frame only.
Because
camera to focus on the subject.
74
and the MF indicator will appear on the LCD monitor (or
and
*Cannot be used in
do not display the AF frame, aim the
or mode.