Archived posting to the Leica Users Group, 1998/06/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]<< Glass is like plastic, brass or steel. Surely nobody cares whether Leica mined their own iron ore or drilled for their own oil? >> Optical glass is not simply a commodity. They are thousands of types of optical glass. In one lens, Leica may use several different types of glass for different elements. Each has its own use. While the source is not critical as long as the glass meets the designer's requirements, it is an interesting question. Tom Shea