Nikon 13187 User Guide (en)

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Autoexposure Lock
Use autoexposure lock to recompose photographs after using center-weighted 
metering and spot metering to meter exposure. Note that matrix metering will not 
produce the desired results.
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 
AE-L/AF-L button to lock focus and 
exposure (if you are using autofocus, confirm 
that the 
I in-focus indicator 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 
AE-L/AF-L button pressed, 
recompose the photograph and shoot.
Shutter-release button
AE-L/AF-L button