Nikon 13187 User Guide (en)

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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.
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Adjusting Shutter Speed and Aperture
While exposure lock is in effect, the following settings can be adjusted without altering the 
metered value for exposure:
Mode
Setting
P
Shutter speed and aperture (flexible program; 
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.
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See Also
If On is selected for Custom Setting c1 (Shutter-release button AE-L
lock when the shutter-release button is pressed halfway. For information on changing the 
role of the 
AE-L/AF-L button, see Custom Setting f4 (Assign AE-L/AF-L button, 0 244).