Canon EOS Rebel T3i 18-55mm IS II Lens Kit - Manual (Page 74)

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The camera automatically sets the shutter speed and aperture to suit
the subject’s brightness. This is called Program AE.
1
Set the Mode Dial to <d>.
2
Focus the subject.
Look through the viewfinder and aim
the selected AF point over the
subject. Then press the shutter button
halfway.
X The dot inside the AF point achieving
focus lights briefly in red, and the
focus confirmation light <o> in the
viewfinder’s bottom right lights (with
One Shot AF).
X The shutter speed and aperture will
be set automatically and displayed in
the viewfinder.
3
Check the display.
A standard exposure will be obtained
as long as the shutter speed and
aperture display do not blink.
4
Take the picture.
Compose the shot and press the
shutter button completely.
d : Program AE
COP
Y