Archived posting to the Leica Users Group, 1999/03/28

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Subject: RE: Antw: [Leica] Autofocus & Leica
From: Alan Ball <AlanBall@csi.com>
Date: Sun, 28 Mar 1999 11:36:44 +0200

Lucien,

As a matter of fact, ALL autofocus bodies provide focus confirmation with 
compatible mount, manual, electronics free lenses (most Nikons and all 
Pentax show complete backward compatibility in that respect). AFAIK, you 
will also get focus confirmation with a Leica R or a M42 lens mounted on an 
EOS body. There is no need for electronics in lenses for focus assistance 
applications: the sensors are in the body and they telemeter points as they 
will appear on the film plane. Electronics come in handy for sophisticated 
TTL flash management, and, depending on the supplier's architecture, 
reliable, non-mechanical, interactive management of the iris.

Alan

On dimanche 28 mars 1999 0:14, Lucien [SMTP:lucien@ubi.edu] wrote:

> Pascal wrote:
>
> > Jeez, what are they waiting for re electronic focus confirmation that 
could
> > be done with a simple upgrade to existing R8 bodies, since the ROM 
lenses
> > already have all the necessary electronic functions? It would also give
> > extra "upgrade" revenue for Leica.

> In don't see why they will need ROM lens for that.
> The Nikon F5 or the Contax RX (?) offer that possibility
> with old lenses without any electronic inside.
> IMO it will work with the previous lenses without ROM also.