Canon EOS 5D Mark III Instruction Manual (en)

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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 Mode Dial to <s>.
2
Set the desired shutter speed.
 
While looking at the 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
Blurred motion
(Slow shutter speed: 1/30 sec.)
Frozen action
(Fast shutter speed: 1/2000 sec.)