Nikon D300s - Manual (Page 119)

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Mirror up Mode
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 M
UP
.
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.
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 (
0 356). The mirror lowers when
shooting ends.
D Using the Viewfinder
Note that autofocus, metering, and framing can not be confirmed
in the viewfinder while mirror is raised.
A Mirror up Mode
A picture will be taken automatically if no operations are performed for
about 30 s after the mirror is raised.
Release mode dial