Canon PowerShot A 1000 IS User Manual page 86

You can lock the exposure setting and shoot. The focus and exposure can
be set sepa rately.
Lock the Exposure.
Point the camera at the subject on which
you wish to lock the exposure. While
pressing the shutter button halfway
CD,
press the .... button
@.
AEL
displays and the exposure is locked .
. Compose the scene and shoot.
After shooting, press the .... button to
cancel AE lock.
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