Lens FUngus?

[bnz506]

Is this for real? I was talking to some dude and hes like yeah you shouldnt always keep your camera in a bag because of lens fungus or something like that. He also said to not breath on my lens to whip finger prints off because it can help the start (or growth) of fungus. I think thats what he said but I have a UV filter on does it matter if I breath on that to whip off finger prints and or troublesome dirt?

How much of a problem is fungus? (is it rare)

How can it be prevented?

Any other info would be cool.

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[ksmattfish]

Lens fungus is real, although it is not caused by keeping a lens in a camera bag or breathing on it. Fungus likes high humidity and/or dampness, and warmth. Don't put gear away wet. Don't store gear in damp places. Take precautions when in the rain forrest or jungle.