Nikon V3 - Manual (Page 238)

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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). Expo-
sure 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.
Assign AE/AF-L Button
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 dis-
played in green.