A Locking The Exposure (Ae Lock) - Canon EOS Rebel T6i Basic Instruction Manual

A Locking the ExposureK
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 picture. This is called AE lock. It is
effective for backlit subjects, etc.
Focus on the subject.
1
Press the shutter button halfway.

 The exposure setting will be
displayed.
Press the <A> button.
2
 The <A> icon lights up in the
viewfinder to indicate that the
exposure setting is locked (AE lock).
Each time you press the <A> button,

the current autoexposure setting is
locked.
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.
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