Canon EOS-1D C - Manual (Page 171)

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In this mode, you set the shutter speed and the camera automatically
sets the aperture to obtain the standard exposure suiting the brightness
of the subject. This is called shutter-priority AE. A faster shutter speed
can freeze the action or a moving subject. A slower shutter speed can
create a blurred effect, giving the impression of motion.
* <s> stands for Time value.
1
Set the shooting mode to <s>.
Press the <W> button and turn
the <6> or <5> dial to select
<s>.
2
Set the desired shutter speed.
While looking at the top LCD panel,
turn the <6> dial.
3
Focus the subject.
Press the shutter button halfway.
X The aperture is set automatically.
4
Check the viewfinder display and
shoot.
As long as the aperture is not
blinking, a standard exposure will be
obtained.
s: Shutter-Priority AE
Frozen action
(Fast shutter speed: 1/2000 sec.)
Blurred motion
(Slow shutter speed: 1/30 sec.)
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