Archived posting to the Leica Users Group, 1997/09/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 01:41 PM 13-09-97 -0400, Marvin Moss wrote: > Dan - etal > > Leitz used to mark their 50/3.5 Elmars with a # from 0 to 9, standing > for 1/10 of a mm (true focal length as opposed to marked FL) and even > earlier, the model 1(A) & 1(C) had a peephole in the rear of the body, > which could be uncovered & a magnifier was used to check the aerial > image & focus was compensated for by shims. Longer lenses had the > true FL written inside in pencil. [snip] Several of my recent vintage Leica M lenses have small numbers engraved near the end of the distance scale. My understanding was that these represented the correction needed to obtain the exact focal length of the lens. Dan C.