b-2
Appendix B : Lens Cleaning Procedure
5975948 RETRODATA 2100 210198
Lens Cleaning Procedure
Cleaning procedure for the SD lens
To minimize the possibility of damaging the optical coating or
scratching exposed lens surfaces, we have developed recom-
mendations for cleaning lenses.
FIRST
, we recommend you try to
remove any material from the lens by blowing it off with de-ionised
air or
lightly
brushing it with a soft, camel's hair brush.
Plastic lens with multilayered coatings & all glass lens elements.
1.
DO NOT
spray any type of fluid directly on the lens surface.
2.
DO NOT
use any dry material to clean the surface (dry rag, tissue,
etc.)
3. Use a commercial liquid window cleaner.
DO NOT use an
aerosol.
Other cleaning agents, such as laboratory-grade
acetone or a 70-30 mixture of ethyl ether and ethyl alcohol may
also be used. If you are not sure of the cleaning agent, experiment
with a small area of the lens first.
4. Use a soft cotton cloth (cotton diapers laundered several times
to remove sizing) or any soft facial tissue (Charmin, Software,
etc.).
5. When using window cleaner,
moisten the cloth or tissue
and
lightly wipe the surface. Then lightly dry with a new tissue.
6. When using acetone or ethyl ether mixture, proceed as follows
: Fold the cloth or tissue several times to form a pad. Soak the
folded end of the pad in the acetone. Starting at the diameter
opposite you, immediately wipe the coated lens, with very little
pressure, toward you in a straight line and off the lens. Do not
stop with the tissue on the lens. Wipe at a speed that is equal to
the evaporation rate. This is very important to prevent streaking
and spotting. Start your wiping at one side of the lens and, with
successive wipes, move to the other side. Turn the pad over for
each wipe, then inside out. Do not make more than one wipe per
clean area of pad. Be careful of the painted edge, since acetone
will soften it.
It is recommended to use a Toraysee
TM
cloth.
Proceed as follows :
* Always wipe lenses in a single direction. Do not wipe back and
forth across the lens surface as this tends to grind dirt into the
coating.
* Do not leave cleaning cloth in either an open room or lab coat
pocket, as doing so can contaminate the cloth.
* If smears occur when cleaning lenses, replace the cloth. Smears
are the first indication of a dirty cloth.
* Do not use fabric softener when washing the cleaning cloth or
softener sheets when drying the cloth.
* Do not use liquid cleaners on the cloth as doing so will contaminate
the cloth.
Order number Toraysee
TM
cloth : R379058.
