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

c1: Shutter-Release Button AE-L
At the default setting of [Off], exposure only locks when the
AE-U
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
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,S 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
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Choose a shorter meter-off delay for longer battery life. When the
camera is powered by an optional EH-Sa or EH-S AC adapter, the
auto meter-off delay is equivalent to [No limit].
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