Nikon D300 User Manual page 214

Interrupting Multiple Exposures
Selecting [Multiple exposure] in the shooting
menu while a multiple exposure is being
recorded displays the options shown at right.
To interrupt a multiple exposure before the
specified number of exposures have been
taken, highlight [Cancel] and press J. If
shooting ends before the specified number of exposures have
been taken, a multiple exposure will be created from the
exposures that have been recorded to that point. If [Auto gain] is
on, gain will be adjusted to reflect the number of exposures
actually recorded. Note that shooting will end automatically if:
• A two-button reset is performed (pg. 182)
• The camera is turned off
• The battery is exhausted
• Pictures are deleted
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