Nikon D3X - D7: LCD Illumination; D8: Exposure Delay Mode

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d7: LCD Illumination
At the default setting of [Off], the control panel backlights (LCD
illuminator) will only light while the power switch is in the D
position.
If [On] is selected, the control panels will be illuminated
while the exposure meters are active (pg. 50).
Select [Off] for
increased battery life.
d8: Exposure Delay Mode
At the default setting of [Off], shutter is released when the shutter-
release button is pressed.
When shooting with [Tripod] selected in
live view mode (pg. 94) or in situations where the slightest camera
movement can blur pictures, [On] can be selected to delay shutter
release until about 1 s after the shutter-release button is pressed
and the mirror is raised.