C: timers/ae lock, C1: shutter-release button ae-l, C2: auto meter-off delay – Nikon D300s User Manual
Page 299: C3: self-timer
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U
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.
Choose how long the camera continues to
meter exposure when no operations are
performed. The shutter-speed and aperture
displays in the control panel and viewfinder
turn off automatically when the exposure
meters turn off.
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.
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