Canon EOS Rebel T5 18-55 IS II Kit - Manual (Page 116)

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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 shot. This is called AE lock. It is effective
for backlit subjects.
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 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’s focus mode switch is set to <MF>, AE lock is applied at the
center AF point.
A Locking the ExposureN
AE Lock Effects
Metering Mode
(p.111)
AF Point Selection Method (p.95)
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.
we AE lock is applied at the center AF point.
COP
Y