> > From: "Don Sanderson" <[EMAIL PROTECTED]> > Date: 2005/05/03 Tue PM 12:03:30 GMT > To: <[email protected]> > Subject: RE: RE: old lenses (A bit long) > > I'll see if I can locate the article I read, it was > a number of years ago in Popular Science, I believe. > It was about the large number of "organic" compounds > used in coatings on such things as film, audio/video > tape, CDs, and of course lenses. > It even had some amazing photos of "fungus at work" > on these coatings. > It caught my eye because I had had a stack of 5.25" > floppy disks die of "mold", which I thought was wierd. > I had not heard of the SMC coatings being ceramic, > doesn't sound like much of a food source for fungus. > But then there are cockroaches that eat plastic. :-(
I alway assumed that the spores would germinate in the suitable microhabitats in the lens, such as the junction of element and body. The filaments (hyphae) would grow out onto the lens surface to a greater or lesser extent and then croak due to lack of sustenance. As has been said, it is exudates from the hyphae that cause the coatings to become etched permanently. I suppose the then croaked bits of hyphae would provide further suitable habitat for more spores to germinate..... > > Don > > > > -----Original Message----- > > From: mike wilson [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, May 03, 2005 6:31 AM > > To: [email protected] > > Subject: Re: RE: old lenses (A bit long) > > > > > > > > > > > > From: "Don Sanderson" <[EMAIL PROTECTED]> > > > Date: 2005/05/03 Tue AM 11:21:04 GMT > > > To: <[email protected]> > > > Subject: RE: old lenses (A bit long) > <snip> > > > The coating on camera lenses is organic, here's the food. > > > > That's the first I've heard of this. Any further information? > > AFAIK, coatings (such as SMC) are ceramic. > <snip> > > > > ----------------------------------------- Email sent from www.ntlworld.com virus-checked using McAfee(R) Software visit www.ntlworld.com/security for more information
