Nikon D500 - Manual (Page 148)

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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 after the mirror is raised.
A Preventing Blur
To prevent blurring caused by camera movement, press the shutter-
release button smoothly. Use of a tripod is recommended.
A
See Also
For information on using the electronic front-curtain shutter to further
reduce blur, see Custom Setting d6 (Electronic front-curtain shutter,
0 298).