Astronomers typically use very large and VERY expensive glass when
compared to photographers, and one of the first rules in optics
cleaning is to NEVER use the lens cleaning solvents and tissues
that are sold to photographers!
Do NOT use a lens brush as the brush soon becomes a carrier of
contaminates.
Use condensation of your breath and a T-shirt ONLY if your lens
is in the same price class as your glasses (and ask your optician
before cleaning your glasses this way).
Another rule is to use ONLY 100% cotton balls on the glass. Anything
other than 100% cotton may contain synthetic fibers which have a high
probability of scratching the coating.
Do the first cleaning with 99% isopropyl alcohol, the second with
acetone C.P. Dampen a cotton ball with the cleaning agent and
LIGHTLY wipe from the center toward the edge. Do not wipe more
than once with the same surface of the cotton ball. Do not wipe
with a part of the cotton ball that you have touched with your
fingers. Do not allow the acetone to come in contact with any
plastic.
You may use from 8 to 25 cotton balls to clean one lens ... sounds
extravagant until you calculate the cost at less than 50 cents!
If you're a hobbyist who regards your photographic equipment as
technological works of art, then there is no such thing as being
too anal in its care!
Have fun,
-Nick
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