Olympus C-770 - Ultra Zoom 4MP Digital Camera Reference Manual page 50

Setting-related modes
P Program shooting
Allows you to take still pictures. The camera sets the aperture and shutter
speed. Other functions, such as flash modes and drive modes, can be
adjusted manually.
p Aperture priority/Shutter priority/Manual shooting
When the mode dial is set to p, the following items can be set with the
menus. g"A/S/M mode" (P.73)
A Aperture priority shooting
Allows you to set the aperture manually. The camera sets the shutter
speed automatically. By decreasing the aperture value (F-number), the
camera will focus within a smaller range, producing a picture with a
blurred background. Increasing the value forces the camera to focus
over a wider range in the forward and backward directions, resulting in
increased "depth of field", in which both the subject and the background
are in focus.
g"Aperture priority shooting" (P.74)
Aperture (F-number) is
decreased.
Shooting modes
Aperture (F-number) is
increased.
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