Nikon D750 User Manual page 262

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Image Review
The K button can not be used to view pictures while time-lapse
photography is in progress, but the current frame will be displayed for
a few seconds after each shot if On is selected for Image review in the
playback menu (0 307). Other playback operations can not be
performed while the frame is displayed.
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Flash Photography
To use the flash during time-lapse photography, select mode P, S, A, or
M and press the M (Y) button to raise the flash before shooting begins.
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Release Mode
Regardless of the release mode selected, the camera will take one shot
at each interval. The self-timer can not be used.
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See Also
For information on setting a beep to sound when time-lapse
photography is complete, see Custom Setting d1 (Beep, 0 338).
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