Using The Focus Lock - Olympus IS-20 Instructions Manual

When the main subject is not in the center of the autofocus
frame, follow the procedure below. This is called focus lock.
Position the autofocus
frame on your subject and
press the shutter release
button halfway.
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.
In focus lock the focus is locked in the
center of the viewfinder and the
exposure is also locked (AE lock) and
averages the exposure for the entire
viewfinder.