Archived posting to the Leica Users Group, 1996/12/06

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Subject: Re: Mysterious pins on R8 lensmount
From: James J Dempsey <jjd@k12-nis-2.bbn.com>
Date: Fri, 06 Dec 1996 18:31:47 -0500

> Realistically, the extra contacts on the body will not have any future use,
> unless they have a present use. I doubt that a company (even Leica) would
> offer retroactive fitting of a function without having it in their
> brochures.

The latest Leica Views which I received only a few days ago says that
one of the functions of the contacts is to communicate information
from a ROM in the lens to the processor in the camera.  The only
example of information to be communicated that it mentioned, I think,
was focal length.  It suggested that the camera could direct a smart
flash to change it's angle of dispersal since the camera would know the
focal length of the lens from the ROM.

It also mentioned that older Leica R lenses could be retrofitted with
the ROM for a small charge.

Seems like a weak explanation, though.  They have a bunch of contacts
there.  Leica M seems to communicate the focal length of the lens to
the camera with no contacts.  There must be a better explanation.

                       --Jim Dempsey--
                         jjd@bbn.com
              http://frontdoor.bbn.com/users/jjd