Olympus C-200 ZOOM Reference Manual page 61

In these situations, first focus your camera on an object that is the same
distance from the camera as your subject, then aim back at the subject
to take the picture (focus lock: p.52). Alternatively, set the focus on ∞
(quick focus: p.53) before taking the shot.
When setting up shots that do not contain vertical lines like as shown in
3, first hold the camera vertically and lock the focus on the subject.
Then shift the camera back to the horizontal position and take the
picture.
1 Subjects with low contrast
2 Subjects that appear
excessively bright in the center
3 Subjects with no vertical lines 6 Subjects not within the AF
4 Subjects of varying distances
5 Fast-moving subjects
target mark
AF target mark
4
51