Re: Feather tracks in lens coatings - any preventative?

heini writes:

Windows are not coated with hard or soft coatings.

I have seen severe cases of lens fungus that are etched much deeper than
coatings, like it was sandblasted. My theory is that the fungus doesn't
eat the glass or coatings, but dust or grease. The glass is etched by
metabolic byproducts. The hyphae grow out onto the glass where there is no
food, in tangled or branching patterns, like a feather or fern.

A little knowledgeable diagnostic work would be good. Like a microscopic
exam after a KOH wash, like is used for diagnosing human fungus infections.
.

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