Archived posting to the Leica Users Group, 2012/03/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]One of the special glass types used in the Nocti and 75 Summilux had an annealing time of over a decade. Really good glass is really expensive. Marty On Thu, Mar 29, 2012 at 8:26 PM, Frank Dernie <Frank.Dernie at btinternet.com>wrote: > Some glass is very expensive to manufacture. The raw materials are not > always expensive, though the Flourite and ED type glasses are very > expensive, with high refractive index glasses they have to be annealed for > several months in order for the refractive index to be constant through the > sample. > This is an expensive process, and one of the reasons this sort of glass is > not much used. > FD > > On 29 Mar, 2012, at 05:40, Richard Man wrote: > > > It's the Glass myth, notably on the "highly refractive indexed" glass > used > > in the Noctilux. It's so much more convincing to think that there are > > secret ingredients that only the elves of Schott laboratory can have > access > > to, and that only Leica can purchase. > > > > Of course it's the optical design, the advantage of the RF design and the > > hand assembly tolerance that give Leica lens its magic. The glass itself > is > > just a small part that everyone can have access to. > > > > > > > > On Wed, Mar 28, 2012 at 9:12 PM, Chris Crawford < > > chris at chriscrawfordphoto.com> wrote: > > > >> All glass is cheap. Christ, its just melted sand! Optical glass has > other > >> ingredients, but it is still very cheap to manufacture. The cost in > making > >> lenses is in the cost of the precision machinery needed to grind the > glass > >> to precise curves and the labor needed to assemble them. > >> > >> -- > >> Chris Crawford > >> Fine Art Photography > >> Fort Wayne, Indiana > >> 260-437-8990 > >> > >> http://www.chriscrawfordphoto.com My portfolio > >> > >> http://blog.chriscrawfordphoto.com My latest work! > >> > >> http://www.facebook.com/pages/Christopher-Crawford/48229272798 > >> Become a fan on Facebook > >> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >