Nikon D800E User Manual page 14

[] 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.
[] Adjusting Shutter Speed and Aperture
While exposure lock is in effect, the following settings can be changed
without altering the metered value for exposure:
Blposure mode Setting
P
Shutter speed and aperture (flexible program; _ 118)
S Shutter speed
/:I Aperture
The new values can be confirmed in the viewfinder and control panel.
Note that the metering method can not be changed while exposure
lock is in effect (changes to metering take effect when the lock is
released).
[] See Also
If On is selected for Custom Setting cl (Shutter-release button AE-L,
290), exposure will lock when the shutter-release button is pressed
halfway. For information on changing the role of the _I:[AE-I./AF-[button
see Custom Setting f6 (Assign AE-L/AF-L button, _ 315).
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