Assign AE/AF-L Button

Choose whether the A button locks both focus and exposure (AE/AF lock), exposure only (AE lock only), or focus only (AF lock only) or can be used to initiate autofocus (AF-ON). Exposure lock is described below, focus lock on page 216.

Autoexposure Lock

Exposure lock is used to recompose photographs after metering exposure. It is most effective when used with center-weighted or spot metering (0 177) to frame off-center subjects that are much brighter or darker than their surroundings or to optimize exposure for an object other than your main subject.

1 Meter exposure.

Position the subject in the center of the frame and press the shutter- release button halfway to meter expo- sure. Check that the focus area is displayed in green.

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