Canon EOS 5D Mark III Instruction Manual (en)

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In this mode, you set the desired aperture and the camera sets the 
shutter speed automatically to obtain the standard 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).
1
Set the Mode Dial to <f>.
2
Set the desired aperture.
 
While looking at the LCD panel, turn 
the <6> dial.
3
Focus the subject.
 
Press the shutter button halfway.
X
The shutter speed is set automatically.
4
Check the viewfinder display and 
shoot.
 
As long as the shutter speed is not blinking, 
a standard exposure will be obtained.
f
: Aperture-Priority AE
Sharp foreground and background
(With a high aperture f/number: f/32)
Blurred background
(With a low aperture f/number: f/5.6)