Archived posting to the Leica Users Group, 2002/03/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- --- Dennis Painter <dennis@hale-pohaku.com> wrote: > How much is a tonne of Leica glass? > <SNIP> > > I do believe there is a significant amount of glass > "consumed" in the > production of a lens element. Cutting shaping and > grinding from a blank > to the final element have to remove material. - ------------------------------------------------------------ I do not know at the moment whom to credit, but one method of reducing waste, and reducing the time spent grinding is to heat a cut blank to plasticity and then press it to shape between two dies. ============================================================ > > I don't know how much but if only 25% of the material > ends up in the > element our pile is still mighty big. - ------------------------------------------------------------ With the cost of optical glass production,the yield is probalby much, much higher. ============================================================ __________________________________________________ Do You Yahoo!? Yahoo! Movies - coverage of the 74th Academy Awards® http://movies.yahoo.com/ - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html