Nikon d3s User Manual (en)

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Focus Lock
Focus lock can be used to change the composition after focusing, 
making it possible to focus on a subject that will not be in a focus 
point in the final composition. It can also be used when the 
autofocus system is unable to focus (
0 98).
1
Focus.
Position the subject in the selected focus 
point and press the shutter-release 
button halfway to initiate focus.
2
Check that the in-focus indicator 
(
I) appears in the viewfinder.
Single-servo AF
Focus will lock automatically 
when the in-focus indicator 
appears, and remain locked 
until you remove your finger 
from the shutter-release 
button. Focus can also be locked by pressing the AE-L/AF-L 
button (see following page).
A
Shutter-Release Button AE-L
If On is selected for Custom Setting c1 (Shutter-release button 
AE-L
0 305), exposure will lock when the shutter-release button is 
pressed halfway.