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Thread: How do I remove mold on LF lens

  1. #1

    Join Date
    Apr 2021
    Posts
    2

    How do I remove mold on LF lens

    I have a couple of LF lenses that have some mold around the perimeter of the glass. Is there an easy way to remove it? Is there a reputable company that can do a good job removing it without harming the lens coating? Thank you.

  2. #2

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    6,082

    Re: How do I remove mold on LF lens

    Need photos to make a diagnosis!
    Coated or uncoated?
    A edge ring effect sounds more like cement degradation rather than fungus.
    Where you live is important to finding help!

  3. #3

    Join Date
    Apr 2021
    Posts
    2

    Re: How do I remove mold on LF lens

    They are coated lenses. the edge ring looks like a rainbow of colors. I live in Denver, but would ship lens to a reputable company. Thank you, Steven

  4. #4

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    8,103

    Re: How do I remove mold on LF lens

    Hmm. The rainbow sounds like Newton's rings, due to separations. Which lenses do you have? Maker, model and serial numbers, please. Some vintages of Rodenstock lenses are very prone to separations, as are a few Schneider lenses and Voigtlaender LF lenses that contain synthetic cements.

  5. #5

    Join Date
    May 2015
    Location
    SooooCal/LA USA
    Posts
    2,273

    Re: How do I remove mold on LF lens

    The mold comes off fairly easily after fuming in a box with old style Listerine (contains thymol) or Lysol solution sprinkled on a rag inside a sealed box that is in a warm place for a week or so... Then element is wiped well with isopropyl alcohol, then washed and carefully dried...

    But the bigger problem is if the mold was on them long enough where it secretes acid that attacks some types of optical glass, then there will be pitting...

    Older coatings don't like mold either, and can be worse than the glass...

    Good luck!!!

    Steve K

  6. #6

    Join Date
    Nov 2017
    Posts
    102

    Re: How do I remove mold on LF lens

    Quote Originally Posted by Mikey View Post
    They are coated lenses. the edge ring looks like a rainbow of colors. I live in Denver, but would ship lens to a reputable company. Thank you, Steven
    yeah, that's not mold. if it's not affecting image quality, leave it alone.

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