Archived posting to the Leica Users Group, 1998/01/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The Morgan & Morgan Leica Manual, Thirteenth Edition, Second Printing dated November 1956 discusses the new 7 element Summicron which comes in a collapsible screw mount as well as a new version for the M3 which comes in a dual range focusing mount in which the lens element can be unscrewed. The manual shows one diagram for this lens and it appears to be the same as the one for the Rigid Summicron shown in later literature. I've always believed that the optical formula was identical between my collapsible and Rigid Summicrons. Bud Cook Snip > >>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.