Archived posting to the Leica Users Group, 2007/03/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mark, It was a variant of computer controlled grinding. Better control and much tighter tolerances. Enjoy On 3/12/07, Mark Rabiner <mark@rabinergroup.com> wrote: > > On 3/11/07 2:45 PM, "Frank Dernie" <Frank.Dernie@btinternet.com> typed: > > > Aha, at the time I read that Leica had gone from ground to hot > > pressing (in a Leica leaflet) the 90mm asph did not yet exist. > > Anyway, as you say, it is the cost which differs. This was the point > > I was trying to make - asph lenses are not necessarily dearer than > > spherical when the aspheres are pressed rather than ground and the > > aspherical surface simplifies the rest of the optics. > > Frank > > > > > > On 11 Mar, 2007, at 18:16, Sander van Hulsenbeek wrote: > > > > > > But I'd heard they'd stop doing the hot pressing and gone on to something > else. "laser" beams probably. CGN CNR CRC something like that. > Had to do with the glass; getting it from Hoya. They didn't like that. > They can still do it cheaply relatively speaking of course as the prices > on > ASPH's didn't go up but they have another way of doing it. High tech and > cutting edge as I recall but just now hot press. > And if no one else heard this than maybe I dreamt it I'm surprised no one > else is chiming in. > > But I seem to recall a discussion at the Leica factory a few months back > about 5 people standing around with Christian Erhardt in a hallway, could > have been a jet lagged hallucination. > > Mark Rabiner > 8A/109s > New York, NY > > markrabiner.com > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- Don don.dory@gmail.com