Nikon D3S - Manual (Page 331)

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If Off is selected, exposure only locks when
the AE-L/AF-L button is pressed. If On is
selected, exposure will also lock when the
shutter-release button is pressed halfway.
Choose how long the camera continues to
meter exposure when no operations are
performed. The shutter-speed and aperture
displays in the top control panel and
viewfinder turn off automatically when the
exposure meters turn off.
Choose a shorter meter-off delay for longer battery life.
Choose the length of the shutter release
delay in self-timer mode.
c: Timers/AE Lock
c1: Shutter-Release Button AE-L
G button
➜ A Custom Settings menu
c2: Auto Meter-off Delay
G button
➜ A Custom Settings menu
c3: Self-Timer
G button
➜ A Custom Settings menu