Nikon d3s User Manual (en)

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Autoexposure (AE) Lock
Use autoexposure lock to recompose photographs after metering 
exposure.
1
Select center-weighted or 
spot metering (
0 116).
Matrix metering will not 
produce the desired results 
with autoexposure lock. If 
using center-weighted 
metering, select the center 
focus point with the multi 
selector (
0 94).
2
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 
exposure (and focus, except in manual 
focus mode). 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.
Metering selector
Shutter-release 
button
AE-L/AF-L
 button