Canon EOS Rebel XT - Manual (Page 82)

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In this mode, you set the shutter speed and the camera automatically
sets the aperture value to suit the subject’s brightness. 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.
s The aperture value is set automatically.
4 Check the viewfinder display and
shoot.
¡ As long as the aperture value is not
blinking, the exposure will be correct.
s Shutter-Priority AE
Fast shutter speed Slow shutter speed