Olympus EVOLT E-500 - Manual (Page 27)

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If correct focus cannot be obtained
The camera's auto-focus may not able to focus on the subject in the cases
shown below (e.g. when the subject is not in the center of the frame, when the
subject has lower contrast than its surroundings, etc.). If this happens, the
easiest solution is to use focus lock.
Subjects that are difficult to focus on
How to use focus lock
(if the subject is not positioned in the center of the frame)
1
Position the AF frame on the
subject you want to focus on.
The AF confirmation mark blinks.
The subject cannot be brought into focus.
Subject with low contrast Excessively bright light
in center of frame Subject with repeated
patterns
The AF mark stays lit, but the subject cannot be brought into focus.
Subjects at different
distances Fast-moving subject Subject not inside AF frame
Shutter button
Card access lamp
AF frame