Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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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 shooting backlit subjects, etc.
1
Focus on the subject.
 
Press the shutter button halfway.
X
The exposure setting will be 
displayed.
2
Press the <A> button 
(0)
.
X
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 exposure setting is locked.
3
Recompose and take the picture.
 
If you want to take more pictures 
while maintaining the AE lock, keep 
holding down the <A> button and 
press the shutter button to take 
another picture.
* When the lens’s focus mode switch is set to <MF>, AE lock is implemented with 
the exposure weighting centered on the center AF point.
A
 Lock the Exposure for Shooting (AE Lock)N
AE Lock Effects
Metering Mode 
(p.253)
AF Point Selection Method (p.106, 107)
Automatic Selection
Manual Selection
q
*
AE lock is applied at the AF 
point that achieved focus.
AE lock is applied at the 
selected AF point.
wre
AE lock is applied at the center AF point.
AE lock is not possible with bulb exposures.