Olympus C-200 ZOOM Reference Manual page 64

When Not Able to Focus on a Subject While Shooting (continued)
To cancel quick focus
on the arrow pad several times until the ∞ mark or macro mark
Press
( ) disappears.
Quick focus can also be cancelled simply by turning
the camera off
To retain the quick focus even after the power is turned off, set the clear
settings function in the shooting menu to OFF (p.98).
However, even when the clear settings function is set to "OFF", quick
focus will be cancelled when a picture is taken.
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