Canon 5D Mark III User Manual (en)

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Use AE lock 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 lock. It is effective for 
backlit subjects.
1
Focus 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, 
it locks the current autoexposure 
setting.
3
Recompose and take the picture.
 
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.
* When the lens’ focus mode switch is set to <MF>, AE lock is applied at the 
center AF point.
A
 AE LockN
AE Lock Effects
Metering Mode 
(p.167)
AF Point Selection Method (p.74)
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.