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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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