Nikon D750 DSLR Camera (Body Only) - Manual (Page 169)

141
Use autoexposure lock to recompose photographs after using
center-weighted metering and spot metering (
0 139) to meter
exposure.
1
Lock exposure.
Position the subject in the selected
focus point and press the shutter-
release button halfway. With the
shutter-release button pressed
halfway and the subject positioned
in the focus point, press the
A AE-L/
AF-L button to lock focus and
exposure (if you are using autofocus,
confirm that the in-focus indicator
(
I ) appears in the viewfinder).
While exposure lock is in effect, an
AE-L indicator will appear in the
viewfinder.
2
Recompose the
photograph.
Keeping the A AE-L/AF-L
button pressed,
recompose the
photograph and shoot.
Autoexposure Lock
Shutter-release button
A AE-L/AF-L button