Archived posting to the Leica Users Group, 1997/03/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]photology@juno.com (Thomas P Myro) wrote: : By saying that the Leitz lenses have a propensity for fogging, you are : asking us to believe that some surfaces of identical composition could : attract pollutants in greater volumes than others of the same compostion. : Flourite is Flourite, and static charges aside, I can't see why some : flourite-coated surfaces could attract more pollutants than others. Marc James Small <msmall@roanoke.infi.net> wrote: > I have never noted a preponderance of fogged glass in Leica lenses. Leica > lenses, in my experience, are far cleaner than are other makes of the era, > especially the Japanese lenses, as they did not, and still do not, enjoy a > quality supply of optical glass in that country. The original poster was not talking about the glass itself or its surfaces as a problem, but about volatile lubricants that Leitz used in their mounts that other manufacturers didn't. I find Marc's comment about Japanese glass incomprehensible. Hoya is the biggest optical glass manufacturer in the world. The materials are all either available anywhere (silica) or low-volume stuff any country can buy on the open market (boron, rare earth elements); the rest is just chemical processing, refining and melting. Why on earth should there be any national differences in this? Thomas: it's f - l - u - o - r - i - t - e . - ---------------------------------------------------------------------------- Jack Campin 2 Haddington Place, Edinburgh EH7 4AE, Scotland 0131 556 5272 http://www.purr.demon.co.uk/purrhome.html - for resources on food allergy & intolerance; McCarrison Society pages; freeware logic fonts for the Mac