Nikon D300s - Manual (Page 266)

240
Q
A Video Mode
If no image is displayed, check that camera is correctly connected and that
the option selected for
Video mode (
0 301) matches the video standard
used in the TV.
A Television Playback
Use of an EH-5a or EH-5 AC adapter (available separately) is
recommended for extended playback. When the EH-5a or EH-5 is
connected, the camera monitor-off delay will be fixed at ten minutes
and the exposure meters will no longer turn off automatically. Note
that the edges may not be visible when photographs are viewed on a
television screen.
A Slide Shows
The
Slide show option in the playback menu can be used for
automated playback ( 0 252).
A Audio
When a movie with sound recorded in stereo using an external
microphone is viewed on a television connected to the camera via an
A/V cable, the audio output is monaural. HDMI connections support
stereo output. Volume can be adjusted using television controls; the
camera controls can not be used.