Archived posting to the Leica Users Group, 1997/01/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In <1.5.4.16.19970102032048.35d74416@roanoke.infi.net>, on 01/01/97 at 10:20 PM, Marc James Small <msmall@roanoke.infi.net> said: >At 11:55 AM 1/1/97 -0500, Dan C. wrote: >>I doubt very much if any third party lens manufacturer (apart from Hughes >>Canada) has any hand in the making of the aspherics (or any of the >>M-lenses, for that matter). >Well, I find it a bit interesting that Docter Optic Technologies, of >Wetzlar, patents a blank-molding method for the mass production of >aspheric lens elements, and that Leica, two or three years later, adopts >a like method for the 1.4/35 ASPH lens. I suspect they licensed the >technology, as the hand-production of elements was bound to be >time-consuming and quite expensive. >Marc Anybody have any idea _how_ they do that? Mold lenses from glass that is. How can they come out of a mold without needing any polishing, or do they? Dennis Experience is a tough teacher. It gives the test before the lesson. - -unknown