Operation Manual

2-23
2.3.3. INSTALLATION OF EYECUP OR EYEGUARD
Perform the following procedure to install eyecup or eyeguard onto
the monocular. Refer to Figure 2.8.
(1) Carefully press the eyecup or eyeguard over the end of the eye-
piece lens.
(2) Rotate the eyecup or eyeguard into proper viewing position. Ad-
just for best fit. The eyecup must seal around your eye and prevent
the green glow from escaping.
2.3.4. INSTALLATION OF DEMIST SHIELD
Perform the following procedures to install the demist shield on the
eyepiece lens. Refer to Figure 2.8.
CAUTION
If the demist shield needs to be cleaned, refer to paragraph
3.3.1. for cleaning. If the demist shield is wiped while wet or
with wet lens paper, you will damage the coating.
NOTE
If inclement operating conditions are expected to exist (e.g.
significant temperature change and high humidity), install
demist shield to minimize eyepiece lens fog prior to execution
of mission.
(1) Carefully remove the eyecup or eyeguard.
(2) Carefully press the demist shield onto the eyepiece. Be careful
not to smudge the eyepiece lens or demist shield.
(3) Replace the eyecup or eyeguard (see paragraph 2.3.3.).
2.3.5. INSTALLATION OF SACRIFICIAL WINDOW
Perform the following procedure to install the sacrificial window.
Refer to Figure 2.8.
CAUTION
If adverse operating conditions (dust or sand) are expected
to exist, attach the sacrificial window to protect the objective
lens from scratches or other damage.
(1) If the objective lens cap is in place, remove it.