Re: [Leica] Jupiter 3, 50mm f1.5, on Leica IIIa

["A.H.SCHMIDT" <horsts@primus.com.au>]

Stanislaw B.A. Stawowy wrote:

> > I purchased a Jupiter 3 for use on my Leica IIIa and found it would not
> > screw down all the way.
> > I tested the lens on a Leica IIIc and a Leica IIIf and found it mounted
> > properly on both.   My Jupiter 9 works fine on the IIIa.
> > Is there something different about the IIIa threads compared to the IIIc and
> > the IIIf?
>
> As far as I recall, older Leica threads were 1/25 inch, later were 1 mm,
> as were Russian Leica copies.
>
> Marc, please correct me if I am wrong.. :-)
>

The pitch for Leica screw mount lenses was always 0.977mm.

Regards, Horst Schmidt