Canon EOS 30D Instruction Manual

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In this mode, you set the shutter speed and the camera automatically 
sets the aperture to suit the brightness of the subject. This is called 
shutter-priority AE. A fast shutter speed can freeze the motion of a fast-
moving subject and a slow shutter speed can blur the subject to give 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.
 
It can be set in 1/3-stop increments.
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
Fast shutter speed
Slow shutter speed