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In this mode, you set the desired aperture and the camera sets the
shutter speed automatically to obtain the correct exposure suiting the
subject brightness. This is called aperture-priority AE.
A higher f/number (smaller aperture hole) will make more of the
foreground and background fall within acceptable focus. On the other
hand, a lower f/number (larger aperture hole) will make less of the
foreground and background fall within acceptable focus.
* <f> stands for Aperture value (aperture opening).
1Set the Mode Dial to <f>.
2Set the desired aperture.
While looking at the LCD panel, turn
the <6> dial.
3Focus the subject.
Press the shutter button halfway.
X
The shutter speed is set automatically.
4Check the viewfinder display and
shoot.
As long as the shutter speed is not
blinking, the exposure will be correct.

f:

Aperture-Priority AE

Sharp foreground and background
(With a small aperture opening)
Blurred background
(With a large aperture opening)