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A Metered Area
In spot metering, exposure will be locked at the value metered in a
4-mm (0.16 in.) circle centered on the selected focus point. In center-
weighted metering, exposure will be locked at the value metered in a
12-mm circle in the center of the viewfinder.
A Adjusting Shutter Speed and Aperture
While exposure lock is in effect, the following settings can be adjusted
without altering the metered value for exposure:
Exposure
mode
Setting
P Shutter speed and aperture (flexible program; 0 38)
S Shutter speed
A Aperture
The new values can be confirmed in the viewfinder and control panel.
Note that metering can not be changed while exposure lock is in effect.
A See Also
If On is selected for Custom Setting c1 (Shutter-release button AE-L,
0 251), exposure will lock when the shutter-release button is pressed
halfway.
For information on changing the role of the A AE-L/AF-L button,
see Custom Setting f6 (Assign AE-L/AF-L button, 0 267).