Using The Focus Lock - Olympus iS-3 DLX Instructions Manual

When the main subject is not in the center of the Autofocus
frame, use the focus lock.
Position the autofocus
frame on your subject and
press the shutter release
button halfway.
Make sure
The autofocus beep is heard, and the
autofocus indicator lights in the
viewfinder.
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USING THE FOCUS LOCK

Autofocus frame
Reposition your subjects in the
picture frame while keeping
the shutter release button
depressed halfway. Then press
the shutter release button fully.
Note:
When the focus is locked, the
exposure is also locked (AE lock).