Archived posting to the Leica Users Group, 1997/10/31

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Subject: Re: Elmarit 90mm
From: Paul Schliesser <>
Date: Fri, 31 Oct 97 12:37:03 -0400

>Does anyone know if the Elmarit 90mm/f2.8 (the one with the detactable
>lens head for use on the Visoflex 1958-1974?) was ever recomputed during
>it's lifetime?  If so, which serial numbers correspond to the old and
>new formulae?  Also, is there a book (preferably in English) which
>would contain information such as this on this and other lenses?


You know those little numbers after the distance scale, which tell you 
what the actual focal length is? When I was photographing stuff for the 
Photo Techniques article, at one point I examined two of these lenses at 
the same time, (both chrome), and happened to notice that one was marked 
00 and the other 90. This means that the second one was nearly 100mm. 
This made me wonder if there was not something different going on here as 
far as optical formula. Both lenses looked identical.

None of the books I've seen mention a change in formula. 

Jim Lager's books have the most detail about lenses of any books that I 
am aware of. His _Leica An Illustrated History, Volume II-Lenses_ covers 
all of the thread mount, M and R lenses, up until 1994. Volume I is on 
cameras, volume III will be accessories, but is not out yet. You can 
order it from Tamarkin,

The other books I've seen either cover lenses superficially or cover only 
modern lenses in any detail.

The one I own, in chrome, is marked 00. The serial number is 1735706. 
Maybe you could poll the list and find out what is out there.

- - Paul