Archived posting to the Leica Users Group, 1996/06/05

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Subject: crackpot idea
From: (Patrick Sobalvarro)
Date: Wed, 5 Jun 1996 15:29:14 -0400

Today I happened across W. J. Markerink's interesting Web page in
which he lists the registration for a number of camera and lens
systems, and discusses when adaptation is and isn't possible (it's at

I had been familiar with the numbers for Leica M (27.95 mm) and R
(47.0 mm) cameras, which make it clear why you can adapt R lenses to M
cameras but not vice-versa without optical elements in the adapter.
But what I thought was interesting was that the Pentacon mount for 6x6
medium format cameras has a registration of 74.1 mm.  This means it
would be possible to mount the Zeiss Jena medium format lenses on a
35mm Leica, providing one made up a suitable adapter.  Medium format
lenses don't typically have the same resolving power as 35mm lenses,
but of course they tend to be better in the center than they are at
the edges and you'd only be using the center.

I don't know quite why I'm interested in trying this -- I guess it's
because I'm a computer scientist and I have an affection for kludges.

Has anyone in the group attempted something like this?

-Patrick Sobalvarro

Replies: Reply from "joe b." <> (Re: crackpot idea)