i have a lens question. can someone tell me what an oxidation spot on a lens ele ment is/looks like? thank you. or, why would a 12" Goerz lens with uncoated elem ents, which are very clear, have an almost un-detectable appearance, to the othe rwise clear front element, of gasoline spilled on water. thank you. this isn't t he rare-earth radio active type of glass one reads about, is it? thank you.
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