how long does it take fungus to grow on lens?

Discussion in 'Camera Building, Repairs & Modification' started by chij, May 13, 2011.

  1. chij

    chij Member

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    i bought an old 35mm rangefinder on ebay
    advertised as clean, fully tested, resealed with a pristine lens

    7 weeks later i'm checking out my equipment late one night for kicks (i know i'm not the only one who does that) and notice fungus. it covers about 0.5cm in length from the edge of the lens to the center, and spans about a fifth of the circumference of the lens

    could it have grown in the 7 weeks since seller shipped it as he claims

    kept it in my dry bedroom
    shot one roll outside when it was dry and cold (early spring)
     
    Last edited by a moderator: May 13, 2011
  2. chioque

    chioque Member

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    Where I'm from (hot >28C, and humid >80% climate all year round), fungus can definitely grow within that time frame, if the lens is not kept in a humidity-controlled dry cabinet
     
  3. Grytpype

    Grytpype Member

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    I'd guess it could grow that quickly in ideal conditions (like Kuala Lumpur!) but I would reckon it would have to be already established in the lens. In less humid conditions, fungus growth would be more likely to take years.
     
  4. Jim Noel

    Jim Noel Member

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    Fungus growth is dependent on light intensity, relative humidity and temperature. Control of these three factors can inhibit the growth.
     
  5. Sirius Glass

    Sirius Glass Subscriber

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    Faster than you want.

    If a camera is sitting around, take off the lens cap, open the aperture and set it in a position so that the lens gets sunlight in it. Then leave it there until it is time to use it again.

    Steve
     
  6. Ian Grant

    Ian Grant Subscriber

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    Only took a month to lose some cameras and lenses stored inappropriately in the UK one Summer. A cool poorly ventilated darkroom can suffer as you get condensation from warmer air from outside. I don't store lenses (or cameras) in an unheated or basement darkroom.

    Ian