A Locking The Exposure (Ae Lock); Ae Lock Effects - Canon EOS Rebel T3 18-55mm IS II Kit Instruction Manual

A Locking the ExposureN
You can lock the exposure when the area of focus is to be different from
the exposure metering area or when you want to take multiple shots at
the same exposure setting. Press the <A> button to lock the exposure,
then recompose and take the shot. This is called AE (autoexposure)
lock. It is effective for backlit subjects.

AE Lock Effects

Metering Mode
(p.100)
*
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* When the lens' focus mode switch is set to <MF>, AE lock is applied at the center AF point.
Focus the subject.
1
Press the shutter button halfway.
The exposure setting will be
displayed.
Press the <A> button.
2
The <A> icon lights in the viewfinder
to indicate that the exposure setting is
locked (AE lock).
Each time you press the <A> button,
it locks the current autoexposure
setting.
Recompose and take the picture.
3
If you want to maintain the AE lock
while taking more shots, hold down
the <A> button and press the shutter
button to take another shot.
AF Point Selection Method (p.83)
Automatic Selection
AE lock is applied at the AF
point that achieved focus.
AE lock is applied at the center AF point.
(0)
Manual Selection
AE lock is applied at the
selected AF point.
105