Nikon D5 - Manual (Page 144)

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Mirror up Mode
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
UP
(mirror up). After
pressing the shutter-release 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 panels; press the shutter-
release button all the way down again to take the picture (in live
view, there is no need to raise the mirror; the picture is taken the
first time the shutter-release button is pressed all the way down).
A beep will sound, unless Off is selected for Beep in the setup
menu (
0 312). The mirror lowers when shooting ends.
Release mode dial