Nikon D780 Reference Manual page 380

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To choose the interval between shots:
Highlight [Interval until
next shot] and press 2 .
- Select 00 to take photos at up to approximately 3 fps. A
setting of 00 is recommended when shooting without a
flash; to ensure the correct exposure when using a flash,
choose an interval long enough for the flash to charge.
334 Other Shooting Options
Choose the number of
secodns between shots and
press J .