Archived posting to the Leica Users Group, 2000/12/01
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> To be precise, the pitch for LTM has always been 26 turns-per-inch
> Whitworth, which equates to .977mm but the slope of the threads is not
> metric but Whitworth, a carry-over from Leitz' microscope origins.
>
Not wanting to be a PITA, I still think: why Russian lenses don't
screw on onder LTM Leicas, but screws easily onto later ones?
I have two IIIc; one from 1948, one from 1949. Jupiter 3, Jupiter 12
and Industar 22 fits later one, but I can't manage to screw them
easily on earlier one. More: I have a "test thread: - I don't know
what the proper name is - it is a precisely made ring with 39mm (AFAIR)
1mm thread. It screws easily on later one, but doesn't screw on earlier
one....
- -----
St.
LeSabre
(Stanislaw B.A. Stawowy)
http://www.geocities.com/Stanislaw_Stawowy