e. Inspect lens elements and filters for chipped surfaces, cracks, and
scratches. Replace defective components of the camera set with serviceable
components.
_______________
6-6
Equipment Cleaning
a. Optical and glass surfaces.
CAUTION:
Dust particles may contain abrasive particles as hard as or
harder than the fluoride coating on the lens surface. Dust
the lens carefully [(2) below] before attempting removal of
fingerprints or any other foreign matter from the optical
surfaces.
(1) Remove the front and rear lens caps from the lens and shutter
assembly.
(2) Carefully remove all dust, dirt, and foreign matter from the exposed
optical surfaces of the lens and shutter assembly, filters, and camera
ground glass; use a camel's hair brush, air syringe, or a gentle blast of
moisture-free compressed air.
(3) Slightly dampen a small wad (one sheet) of lens tissue with lens
cleaner.
CAUTION:
Do not use lens tissue that contains silicons to clean
optical surfaces.
Any residue deposit that would be left
on the optical surfaces by this kind of lens tissue could
affect the performance of the lens and filters.
(4) Gently wipe the exposed optical surfaces of the lens and filters
with the moistened lens tissue; using a circular motion, start from the edge
of the glass and work toward the center.
(5) Dry the cleaned areas with a fresh sheet of lens tissue; use the
same circular motion described in (4) above.
(6) Clean the camera ground glass surface with a clean, lint-free
cloth dampened with clear water.
After cleaning, dry the cleaned area
thoroughly.
(7) Install the front and rear lens caps on the lens and shutter
assembly.
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