Sanford Posted March 22, 2019 Share Posted March 22, 2019 Whatever they/it are consuming in there has to run out sometime. Link to comment Share on other sites More sharing options...
Alan Marcus Posted March 22, 2019 Share Posted March 22, 2019 (edited) To mitigate the 7 major lens aberration, opticians construct the camera lens using a array of lenses. Each element will have a different power, some strong some weak, some positive, some negative. Additionally, some are made using a very hard dense glass, others less dense. Some elements are air-spaced apart, some in direct contact with its neighbor. Lens elements in direct contact are routinely cemented together. The cement must have special optical properties. For decades, a resin made from the sap of the Canadian Balsa Pine was used. This is clear strong resin is organic and thus food for beasties (mold & mildew). Nowadays, optical cements are manmade resins. Besties find these artificial resins lest tasty but sometimes the besties are tempted to dine. Often its crazing due to separation - can look like mold etc. Edited March 22, 2019 by alan_marcus|2 5 Link to comment Share on other sites More sharing options...
Ed_Ingold Posted March 22, 2019 Share Posted March 22, 2019 Although inorganic, some coatings may contain nutrients for molds, some of which find refuge and sustenance in the harshest environments on earth. 1 Link to comment Share on other sites More sharing options...
Hector Javkin Posted March 22, 2019 Share Posted March 22, 2019 Dust that's gotten inside a lens typically contains organic matter. And, of course, some fungi eat other fungi. 1 Link to comment Share on other sites More sharing options...
Tony Parsons Posted March 22, 2019 Share Posted March 22, 2019 This may shed some light :) on the topic : Canada balsam - Wikipedia 2 Link to comment Share on other sites More sharing options...
conrad_hoffman Posted April 27, 2019 Share Posted April 27, 2019 I've noticed that some of my Mamiya TLR lenses are very susceptible to fungus. It's always on the inside surface of one lens, but not the other. The bugs obviously have a very discerning palette when it comes to optical glass types. Link to comment Share on other sites More sharing options...
Ricochetrider Posted May 14, 2019 Share Posted May 14, 2019 I've noticed that some of my Mamiya TLR lenses are very susceptible to fungus. It's always on the inside surface of one lens, but not the other. The bugs obviously have a very discerning palette when it comes to optical glass types. Discriminating fungi & molds ONLY dine in the finest of lenses? (why settle for less, right?) Link to comment Share on other sites More sharing options...
Sanford Posted May 14, 2019 Author Share Posted May 14, 2019 I don't think mold is necessarily seeking out the finest lenses, just the ones you paid the most money for. Link to comment Share on other sites More sharing options...
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