Olympus D-340L Mode D'emploi page 82

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AUTOFOCUS
Although the autofocus can lock on virtually any subject, there
are certain conditions, such as 1 ~ 3 shown below, where it
may not be possible to obtain the correct focus. In the
situations shown below in 4 ~ 5, autofocus may not lock on
the correct subject even though the Condition indicator LED
lights and the shutter releases.
1 Subjects with low contrast
Use the focus lock by first focusing on something at the
same distance as the subject you wish to take a picture
of, and then aim at the subject.
2 Subjects that do not contain vertical lines
Use the focus lock first while holding the camera
vertically. Then switch the camera to the horizontal
position to take the photograph.
3 Subjects in excessively bright light
Use the focus lock by first focusing on something at the
same distance as the subject you wish to take a picture
of, and then aim at the subject.
4 Two subjects at different distances
When the subject looks out of focus even though the
Condition indicator LED lights, focus on another subject
at the desired camera-to-subject distance first. Then
recompose the frame to take the picture.
5 High-speed subjects at close range
Focus on another subject at the desired camera-to-
subject distance first. Then recompose the frame to take
the picture.