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Re: (meteorobs) Re: [ASTRO] Dew prevention on lens with soap
At 12:06 PM 11/6/98 EST, you wrote:
>I
>claudio<< Interesting. The obvious questions are what the process does to the
> existing lens coatings over time and if any discernible change occurs to
> the image.<<
>
>Hi George,
>Boy, I don't know? Soap is a good emulsifying agent and perhaps would help
to spread the water out over a larger surface area of a lens. Many lenses,
however, have either one or multiple layers of a UV antiglare coating of
MgO or Mg Flouride of which may react over time to the application of a
"soap film." I'm also not sure if a thin soap film would affect the
refractive properties of the lens or not. Also, one runs the risk of
possible abrassion to the lens when cleaning off this soap film. These
coatings are meant to withstand a certain amount of abrassion when cleaned
with lens tissue, although cleaning off a soap film may require more
friction. Furthermore, many soaps have perfume additives and some even have
abrassive agents, etc. which may also react with the lens coating. I guess
I would be hesitant to try this with my lens. I would definitely use a very
pure and mild soap if I did. I guess I will stick with the more traditional
methods involving radiant heat transfer. Occasional soap film applications
probably okay, however, if used considerably overtime?
Good Luck,
Mark Mikutis
>
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