Olympus 2004 - Manual (Page 38)

If correct focus cannot be obtained
38
2
Shooting
Subjects that are difficult to focus on
Under the following conditions, auto focus may not work properly.
The green lamp blinks:
The subject cannot be
brought into focus.
Subjects with low contrast Subjects in excessively bright
light in the center of the frame
Subjects with no vertical lines
The green lamp lights,
but the subject cannot
be brought into focus.
Subjects with different
distances Fast-moving subjects The subject you are focusing
on is not in the center of the
frame.
If this happens, focus on a high-contrast object the same distance away as the
intended subject, recompose your shot and then take the picture. If the subject has no
vertical lines, hold the camera vertically and adjust the focus, then return the camera to
the horizontal position to take the picture.
“Determine the position of the subject after focusing (Focus Lock)”
~
P. 39