Mirror lockup lever – Nikon Camera F3AF User Manual
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Mirror Lockup Lever ®
In the following situations, the F3AF’s mirror ® must be locked
in the "up” position: when you want to operate the Motor Drive
MD-4 at 6 frames per second or when using certain fisheye
lenses which do not feature through-fhe-lens viewing. Also,
when using super-telephoto lenses or doing photomicrography,
it becomes necessary to minimize camera vibration. To lock the
reflex viewing mirror in the "up" position, push in the depth-of-
field preview button d) and rotate the lever counterclockwise
until it stops. To return the mirror to the “down" position, rotate
the lever clockwise until it stops.
Do not release the shutter unless the mirror is completely in the
"up” or “down" position.
Caution:
With the mirror locked up, you should not operate the camera
on automatic. Even though the LCD continues to show you the shutter
speed automatically selected by the camera, this speed will not produce
the correct exposure. Autofocus operation with the mirror in the "up"
position is also impossible.