Nikon D610 - Manual (Page 137)

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Z
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.
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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; 0 75)
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, 0 226), 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 f4 (Assign AE-L/AF-L button, 0 244).