Nikon D300 - C: Timers;Ae Lock; C1: Shutter-Release Button AE-L; C2: Auto Meter-Off Delay

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c1: Shutter-Release Button AE-L
At the default setting of [Off], 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.
c2: Auto Meter-off Delay
Choose a shorter meter-off delay for longer battery life. When the
camera is powered by an optional EH-5a or EH-5 AC adapter, the
auto meter-off delay is equivalent to [No limit].
c: Timers/AE Lock
This option controls how long the camera
continues to meter exposure when no
operations are performed. Choose from 4 s,
6 s, 8 s, 16 s, 30 s, 1 minute, 5 minutes,
10 minutes, 30 minutes, or until the camera is
turned off ([No limit]). The shutter-speed and
aperture displays in the control panel and
viewfinder turn off automatically when the
exposure meters turn off.
Option
Q 4s
R 6s (default)
S 8s
T 16 s
U 30 s
V 1min.
W 5min.
X 10 min.
Y 30 min.
Z No limit