Nikon D7200 body - Manual (Page 132)

108
A
Spot Metering
In spot metering, exposure will be locked at the value metered at the
selected focus point (
0 105).
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:
Mode Setting
P Shutter speed and aperture (flexible program; 0 52)
S Shutter speed
A Aperture
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,
0 279), 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, 0 285).