Olympus AZ-4 Zoom - Manual (Page 20)

Using the Focus Lock
For use when the subject is not in the center of the autofocus frame.
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Center the subject within the autofocus
frame.
Press the shutter release button lightly to
lock focus on that subject.
* When focused, you will hear the "beep-
beep" sound. The AF indicator will light
in the Viewfinder.
Maintain the focus lock by keeping the
release in this position and recompose the
picture. Now fully depress the shutter
release to take the picture.
The distance indicator appears in the LCD
panel. (See p. 46)