Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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In this mode, you set the shutter speed and the camera automatically 
sets the aperture to obtain the standard exposure matching the 
brightness of the subject. This is called shutter-priority AE. A faster 
shutter speed can freeze the action of 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 or in 
the viewfinder, turn the <6> dial.
3
Focus on 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, the standard exposure will 
be obtained.
s
: Shutter-Priority AE
Blurred motion
(Slow shutter speed: 1/30 sec.)
Frozen motion
(Fast shutter speed: 1/2000 sec.)