Canon ADVANCED EOS IX 7 Instructions Manual page 50

A\v Aperture-Priority AE Mode
When you set the aperture speed, the camera automatically sets the
shutter speed to provide the correct exposure for the subject brightness.
This is called "aperture-priority AE."
Decreasing the aperture value (opening the aperture) makes the
background appear blurred, for more attractive portrait shots. The lower the
aperture value, the more the background is blurred. Increasing the aperture
(closing the aperture) in a scene with depth brings both nearby and distant
objects into sharper focus. The higher the aperture value, the deeper the
range of sharp focus. The aperture is set with the electronic dial.
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Higher aperture setting Lower aperture setting
Turn the Mode Dial to Av .
Select the aperture setting.
Look at the LCD pane! while you turn
Dai) the electronic dial to the desired
shutter speed.
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