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Thread: Eliminated lens-corroding fungus

  1. #1
    Senior Member RichA's Avatar
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    Eliminated lens-corroding fungus

    I picked up an old WW2 telescope lens in a brass mount at an antique sale. The lens had fungus which had apparently eaten into the lens. Would not come off with methyl alcohol, acetone or lens-cleaning fluid. So I tried some Peek metal polish. It worked! The lens hadn't been corroded, but the fungus had gone rock hard and had to be polished off. The lens is now clean. This lens had no coatings, it's possible doing this to a lens with coatings would effect or abrade it.

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    Member slosync's Avatar
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    Re: Eliminated lens-corroding fungus

    Quote Originally Posted by RichA View Post
    I picked up an old WW2 telescope lens in a brass mount at an antique sale. The lens had fungus which had apparently eaten into the lens. Would not come off with methyl alcohol, acetone or lens-cleaning fluid. So I tried some Peek metal polish. It worked! The lens hadn't been corroded, but the fungus had gone rock hard and had to be polished off. The lens is now clean. This lens had no coatings, it's possible doing this to a lens with coatings would effect or abrade it.
    Thanks for that information Rick. I had tried cleaning my old Oly H. Zuiko lens with the same kind of fungus problem with no success. This sounds like something worth trying since the lens is currently a paperweight.

    I wonder if any other folks have had any success stories?

    Even if it cleans the fungus off, the lens glass would likely be damaged by the cleaning process I would think. I ordered a tube of the Peek metal cleaner.... No harm in trying.

    Cheers,
    Don

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