Canon EOS-1D C - Manual (Page 173)

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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 shooting mode to <f>.
Press the <W> button and turn
the <6> or <5> dial to select
<f>.
2
Set the desired aperture.
While looking at the top 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
Blurred background
(With a low aperture f/number: f/5.6)
Sharp foreground and background
(With a high aperture f/number: f/32)
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