Aperture-Priority Ae - Canon EOS Rebel XT Instruction Manual

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Aperture-Priority AE •••
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In this mode, you set the desired aperture and the camera sets the
shutter speed automatically to suit the subject brightness. This is called
aperture-priority AE.
A larger aperture opening (lower f/number) will result in a blurred
background ideal for portraits. This occurs because a lower f/number
decreases the depth of field (range of acceptable focus). On the other
hand, a smaller aperture opening (higher f/number) will make more of
the foreground and background fall within acceptable focus. A smaller
aperture opening increases the depth of field.
*
<Av>
stands for Aperture value.
With a large aperture opening
With a small aperture opening
Set the Mode Dial to
<Av>.
Set the desired aperture value.
While looking at the LCD panel, turn
the <B> dial.
It can be set in 1/3-stop increments.
Focus the subject.
Press the shutter button halfway.
The shutter speed is set automatically.
Check the viewfinder display and
shoot.
As long as the shutter speed is not
blinking, the exposure will be correct.
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