Optical Surfaces

TM 11-2330A C2

(3) If foreign matter cannot be removed from the exposed parts

by normal dry wiping, use a clean, lint-free cloth slightly

moistened with cleaning compound. Wipe the cleaned parts

with a clean, dry, lint-free cloth immediately after cleaning.

b. Optical Surfaces. Clean the optical surfaces (except the front

surface mirror) of the equipment as follows:

(1) Carefully remove all dust, dirt, and foreign matter from the

exposed optical surfaces of the equipment; use a camel's-hair

brush or an air syringe.

Caution: Do not use lens tissue that contains silicone

to clean optical surfaces. Use only the lens tissue author-

ized for use with the equipment (par. 21). Any residue

left on the optical surfaces by lens tissue that contains

silicone could affect the performance of the optical parts.

(2) Slightly dampen a wad of lens tissue with lens cleaner.

(3) Gently wipe the exposed optical surfaces of the equipment

with the moistened lens tissue; use a circular motion starting

from the edge of the glass and working toward the center.

(4) Dry the cleaned optical surfaces with a fresh lens tissue, using

the circular motion described in (3) above.

c. Front Surface Mirror. Clean the front surface mirror as follows:

Caution: The reflecting coating of the front surface mirror is

deposited on the front surface and is not protected by glass. This

surface is extremely delicate. Do not rub or touch with the fin-

gers. Do not clean with water. Use the cleaning procedures (I)-

(4) below only when absolutely necessary.

(1) Carefully remove all dust, dirt, and foreign matter from the

reflecting surface; use a camel's-hair brush or an air syringe.

If additional cleaning is required, perform the procedures in

(2), (3), and (4) below.

Caution: Do not use lens tissue that contains silicone

to clean the f rent surface mirror. Use only the lens tissue

authorized for use with the equipment (par. 21).

(2) Slightly dampen a wad of lens tissue with lens cleaner.

(3) Gently wipe the reflecting surface with the moistened lens

tissue.

TAGO 6432B