Nikon D4 - Manual (Page 162)

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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 changed
without altering the metered value for exposure:
Exposure mode Setting
e Shutter speed and aperture (flexible program; 0 126)
f Shutter speed
g Aperture
The new values can be confirmed in the viewfinder and top control
panel. Note that the metering method 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,
0 316), exposure will lock when the shutter-release button is pressed
halfway. For information on changing the role of the center of the sub-
selector, see Custom Setting f6 (Assign sub-selector center,
0 333).