Archived posting to the Leica Users Group, 2001/01/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On 17 Jan 2001, at 14:54, Rodgers, David wrote: > I wonder if this is really and apples to apples comparison. Modern aspheric > elements are pressed (molded) not ground. (Though amazingly, I believe the > asphericaL elements were ground in the original 35/1.4 Aspherical). I also > believe in most cases aspherical elements are pressed from plastics, not glass. > Somebody please correct me if I'm wrong. Dave, For the Leica literature for the current APO-SUMMICRON- M f/2/90mm ASPH.: "One element has an aspherical surface which, due to its size, had to be produ- ced in a complicated grinding and polishing process." Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 Fax +61-2-9554-9259 UTC(GMT) +10 Hours audiob@ozemail.com.au http://www.ozemail.com.au/~distudio/publications.html