Function
Controls and indicators
Two-position toggle switch:
POWER switch
Function
Pos
Applies power to
ON
viewer.
OFF
Removes power
from viewer.
BRIGHTNESS control
Rotates clockwise and coun-
terclockwise to control
brightness of observed
image.
Rotates clockwise and counter-
CONTRAST control
clockwise to control contrast
of target to background on
cathode-ray tube display.
Moves up to FAR
or
FOCUS lever
down to NEAR (8M) to
provide best objective lens
focus on target being
viewed.
Function
Pos
FAR
Viewer fo-
cused at
infinity.
NEAR (8M) Viewer fo-
cused at
less than
8 meters.
2-3
