Archived posting to the Leica Users Group, 1998/01/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 12:04 PM 1/28/98 +0100, Erwin Puts wrote: >This statement has been made several times and has never been proved. The >original Leica brochure from 1954, describing the introduction of the >Summicron, including its optical properties, show the identical design for >both versions. My own findings support the conclusion that the collapsible, >the rigid and the DR are optically identical. Unless somebody gives really >factual and conclusive evidence to the contrary, I would prefer to state >that there were inly three designs and the current one is number 3 and not >number 4. Well, for starters, they have different lengths and thus MUST be a different formula. Harold Merklinger, a Canadian optical scientist, has written on this -- see his web page for details: http://fox.nstn.ca/~hmmerk/HMbook15.html For another, the COLLECTORS CHECKLIST TO LEICA CAMERAS lists a different UK patent number for the rigid from the collapsible. My copy is not at hand, nor have I ever compared the two. Marc msmall@roanoke.infi.net FAX: +540/343-7315 Cha robh bas fir gun ghras fir!