Canon EOS50DBODY ユーザーズマニュアル

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In this mode, you set the shutter speed and the camera automatically 
sets the aperture to obtain the correct exposure matching the 
brightness of the subject. This is called shutter-priority AE. A faster 
shutter speed can freeze the action or moving subject. Or 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, the exposure will be correct.
s
: Shutter-Priority AE
Frozen action
(Fast shutter speed)
Blurred motion
(Slow shutter speed)
COP
Y