Nikon D300 User Manual page 117

Choose this mode to minimize blurring caused by camera
movement when the mirror is raised. Use of a tripod is
recommended.
1
Select mirror up mode.
Press the release mode dial
lock release and turn the
release mode dial to MuP.
Release mode
dial
2
Raise the mirror.
Frame the picture, focus, and then press
the shutter-release button the rest of the
way down to raise the mirror.
Using the Viewfinder
Note that autofocus, metering, and framing can not be confirmed in
the viewfinder while mirror is raised.
3
Take a picture.
Press the shutter-release button all the
way down again to take a picture. To
prevent blurring caused by camera
movement, press the shutter-release button smoothly, or use
an optional remote cord (pg. 369). The mirror lowers when
shooting ends.
[] Mirror up Mode
A picture will be taken automatically if no operations are performed for
about 30 s after the mirror is raised.
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