Nikon F4 Body Only Film Camera User Manual


 
MIRROR
LOCKUP
LEVER
A highly efficient, tungsten-alloy shutter balancer
is
incorporat-
ed
in
the shutter unit. The balancer operates during shutter
operation to overcome vibration normally caused by the shutter
curtain in other cameras.
When using super-telephoto lenses
or
doing photomicrogra-
phy,
it
is
necessary to reduce camera vibration
to
the absolute
minimum.
To
lock the reflex viewing mirror in the "up" position,
push
in
the depth-of-field preview button and rotate the mirror
lockup lever counterclockwise until
it
stops.
With the mirror locked up, you cannot operate the camera
in
any Auto Exposure or autofocus mode, even though the view-
finder
LCD
may indicate otherwise. Any indication of light by
the
LCD
is
a result of spurious light entering through the
viewfinder eyepiece.
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