Mirror Up Mode (Mup) - Nikon D780 Reference Manual

Mirror up Mode (M )
UP
Choose this mode to minimize blurring caused by camera
movement when the mirror is raised. To use mirror-up mode,
press the release mode dial lock release and rotate the release
mode dial to M (mirror up). After pressing the shutter-release
UP
button halfway to set focus and exposure, press the shutter-
release button the rest of the way down to raise the mirror. Z
will be displayed in the control panel; press the shutter-release
button all the way down again to take the picture.
D
Mirror Up
While the mirror is raised, photos cannot be framed in the viewfinder and
autofocus and metering will not be performed.
Shooting Settings
185