Canon EOS 30D - Manual (Page 86)

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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.
* 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