Re: B&L Stereozoom 7 Objectives

Kevin Cunningham writes:

They grow on the coating material, appearantly,
and the damage is impossible to get rid of.

"Grows on the coating" is indeed part of the lore, but I can't believe a
living thing could find nutrition from submicron-thick MgF2 and the like.
I suspect that surface films and contaminants like oil and dust are the
attraction.

You can have fungus growing without necessarily damaging the glass. The
damage is said to stem from enzymes and acids secreted by the fungus as
part of its digestive process, which occurs outside the organism. Kind of
like an inside-out stomach.
.

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