Nikon D7200 body - Manual (Page 95)

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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. The viewfinder or monitor will turn off; in viewfinder
photography, the mirror will be raised. Press the shutter-release
button all the way down again to take the picture. When
shooting ends, either live view will resume or (in viewfinder
photography) the mirror will lower.
Mirror up Mode (M
UP
)
Release mode dial lock release
Release mode dial
D
Mirror Up
While the mirror is raised, photos can not be framed in the viewfinder
and autofocus and metering will not be performed.
A
Mirror up Mode
A picture will be taken automatically if no operations are performed for
about 30 s with the mirror raised.