Nikon D300s - Manual (Page 300)

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U
Choose how long the monitor remains on
when no operations are performed during
playback (
Playback; defaults to 10 s) and
image review (
Image review; defaults to 4 s)
or when menus (
Menus; defaults to 20 s) or
information (
Information display; defaults
to 10 s) are displayed. Choose a shorter monitor-off delay for
longer battery life. Regardless of the setting chosen, the monitor
remains on if no operations are performed for about ten minutes
when the camera is powered by an optional EH-5a or EH-5 AC
adapter.
c4: Monitor off Delay
G
button ➜ A Custom Settings menu