Canon EOS40D instruction manual AAE LockN, Recompose and take the picture, AE Lock Effects

AAE LockN

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.

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Focus the subject.

Press the shutter button halfway.

XThe exposure setting will be displayed.

Press the <A> button. (0)

XThe <A> icon lights in the viewfinder to indicate that the exposure setting is locked (AE lock).

Each time you press the <A> button, it locks the current exposure setting.

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.

AE Lock Effects

Metering Mode	AF Point Selection Method
	Automatic Selection	Manual Selection
qEvaluative	AE lock is applied at the AF	AE lock is applied at the
metering*	point that achieved focus.	selected AF point.
wPartial metering
rSpot metering	AE lock is applied at the center AF point.
eCenter-weighted
average metering

*When the lens’ focus mode switch is set to <MF>, AE lock is applied at the center AF point.

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