Olympus D-460 Zoom - Manual (Page 48)

48
AUTOFOCUS
There are certain conditions where the autofocus may not work properly
even when the Green lamp lights when the Shutter release button is
pressed halfway. When this happens, try the procedure below or use
Quick focus. (p. 60)
1 Subjects with low contrast
Lock the focus on an object that is at the same distance from the camera
as the subject, then aim at the subject to take the picture. (p. 47)
2 Subjects with no vertical lines
Lock the focus on the subject by holding the camera vertically, then
change it to the horizontal position to take the picture. (p. 47)