Nikon D300 User Manual page 215

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Multiple Exposure
Do not remove or replace the memory card while recording a multiple
exposure.
Live view (pg. 79) can not be used to record multiple exposures.
The information listed in the playback photo information display
(including date of recording and camera orientation) is for the first shot in
the multiple exposure.
If no operations are performed for 30 s after the monitor has turned off
during playback or menu operations, shooting will end and a multiple
exposure will be created from the exposures that have been recorded to
that point.
B
Interval Timer Photography
If interval timer photography is activated before the first exposure is
taken, the camera will record exposures at the selected interval until the
number of exposures specified in the multiple exposure menu have been
taken (the number of shots listed in the interval timer shooting menu is
ignored). These exposures will then be recorded as a single photograph
and multiple exposure mode and interval timer shooting will end.
Cancelling multiple exposure cancels interval timer shooting.
B
Other Settings
While multiple exposure mode is in effect, memory cards can not be
formatted and the following can not be changed: bracketing and
shooting menu options other than [White balance] and [Interval timer
shooting] (note that [Interval timer shooting] can only be adjusted before
the first exposure is taken). The [Lock mirror up for cleaning] and [Dust off
ref photo] options in the setup menu can not used.
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