Archived posting to the Leica Users Group, 1997/08/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In einer eMail vom 04.08.1997 09:21:27, schreiben Sie: >>I believe the lens you're talking about is the rigid Summicron lens made >>from 1953 to 1956 and having 4 of its 7 elements made from lanthanum >>glass, a rare earth glass. Leitz lens numbers and year: 1952 N= 79 Summicron collapsible prototypes (Sumitar *) year from to 1953 1 051 001 1 124 000 1954 1 124 001 1 236 000 1955 1 236 001 1 333 000 1956 1 333 001 1 459 000 1957 1 459 001 1 548 000 Dennis Laney [(1995-2): Leica Collectors Guide. Hove Collectors Books, p130-136], says also, that the rigid Summicron has been "identical in all details" to the screw version (p 132), and that this version was available till 1957. The best performance was at f4.0 (p 132). Distance was given first in meter, then in meter _or_ feet, later meter _and_ feet. Screw version 1953 to 1963, first bajonett version 1954 to 1968, DR M bajonett 1956 to 1968, 1969 2nd computation, 1980 3rd computation (better performance, specially at close distances, p136). Weight (7 lenses) screw version: 220 g, rigid version: 285 g. Maybe someone knows the weight of the 6 lens Summicron. Than you (maybe) can deduct, whether you have the 7 or 6 lens version. - -Alf