Archived posting to the Leica Users Group, 1997/07/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 14:22 14/07/97 PST, you wrote: > Hi, > > I just wonder how a developing spot of fungus in a lens affect the > image quality? Is it critical to clean the lens? Also does it keep > growing once it started or can it be prevented if it is kept in dry > environment? > > Thanks, > David This what I've been told; exposure to the UV light in daylight will kill the existing fungus. Once it's dead it won't grow any more (unless of course you allow the unsuitable environment that encourages it- fungus spores are carried in the atmosphere so any lens can theoretically get fungus in damp/dark conditions). Just take the caps off and open the diaphragm and leave it in the light for a day or two. Don't worry about the UV light not getting through the windows- it will. Observe commonsense precautions about direct sun; don't fry the lens and don't allow its ability to focus light and heat rays to start a fire! After that, cleaning may be a good idea if you think the image quality is affected. Do not store lenses in damp dark places. Joe Berenbaum