Canon EOS 800D, Basic Instruction Manual

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You can lock the exposure when you want to set the focus and
exposure separately or when you are 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.
 The exposure setting will be
displayed.
2
Press the <
A
> button
(
0
)
.
 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.

When you are 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
Locking the Exposure
N
AE Lock Effects
Metering
Mode
AF Point Selection Method (p.98)
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.