Nikon Df - Manual (Page 175)

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Multiple Exposures
Do not remove or replace the memory card while recording a multiple
exposure.
The shooting information listed in the playback photo information
display (including date of recording and camera orientation) is for the
first shot in the multiple exposure.
ISO sensitivity is fixed at the value for the first shot in each series;
rotating the ISO sensitivity dial while shooting is in progress has no
effect.
A
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 interval timer shooting will end (if On (single photo) is
selected for multiple exposure mode, multiple exposure shooting will
also end automatically).
A
Other Settings
While a multiple exposure is being shot, memory cards can not be
formatted and some menu items are grayed out and can not be
changed.