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01-23-2011, 07:46 PM   #31

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-All air on Earth contains water vapor, unless artificially dried.
-No camera lens contains an airtight vacuum. A zoom would not function with a vacuum or airtight seals.


There is water vapor in all lenses, no matter how "WR". Fungus does not require standing water to grow. It can grow by pulling moisture directly from the air.

Another point: fungus takes a long time to grow in a relatively sterile environment such as a lens. Just check your bathroom, which has far more water and organic matter. Even if you never clean it and leave water everywhere, it takes weeks for it to get really noticable. There's hardly anything inside the lens for fungus to grow from. It is extremely unlikely that a single incident could suddenly cause a significant growth. Most likely it had been growing for a long time now, and only now was it noticed.

Last edited by Cannikin; 01-23-2011 at 07:59 PM.
01-24-2011, 02:57 AM   #32
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QuoteOriginally posted by stevebrot Quote
( don't have to have a leak to get visible droplets inside a lens either...humid lens change indoors in winter followed by taking the camera outside into the snow...)
I agree, I've had waterproof watches get fogged up behind the crystal when exposed to a big change in temperature.

...Speaking of which, why doesn't fungus grow on watch crystals and on the watch face itself?

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