ALocking the Exposure (AE Lock)N 
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 <YA> 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 <YA> button. (8)
X<A> will appear and the exposure will be locked (AE lock).
Press the <YA> button again to cancel the AE lock.
Recompose and take the picture.
If you want to maintain the AE lock while taking more shots, hold down the <YA> button and press the shutter button to take another shot.
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