Mirror lockup lever – Nikon F4 User Manual
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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.