Kodak DCS600 - Manual (Page 53)

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Mirror Lockup Lever
When using super-telephoto lenses or performing photomicrography, it is necessary to
reduce camera vibration to the absolute minimum.
Lock the reflex viewing mirror in
the up position by rotating the
mirror lockup lever
counterclockwise until it stops.
☛
When the mirror is locked up,
you cannot operate the camera
in any Auto Exposure or
autofocus mode, even though
the viewfinder LCD may
indicate otherwise. Any
indication of light in the LCD
is a result of light entering
through the viewfinder
eyepiece.
CAUTION:
Do not to leave the camera in direct sunlight when the reflex mirror is locked in
the up position. The sunlight may damage the shutter curtain.