Re: Feather tracks in lens coatings - any preventative?

NoSpam writes:

If you have a sample and like to contribute it, please let us know.

I have the earlier described lens. They're about 10mm diameter glass
elements that I could remove and send. They're heavily damaged on the
edge, progressing to clear in the center, as if the fungus grew in the
corners. As I also described earlier, the Martian fungus, or whatever it
was, was thoroughly cleaned off, so only the etching remains. Anyway, it
is junk other than its value as a fungus damage specimen, so you're welcome
to destructively examine it for the sake of optical science, just tell me
where to forward it if it sounds like a suitable candidate. (Email in
above headers is genuine.)
.

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