TAKO. INTERNET SEIT 1996.
Olympus-OM

[OM] Strange AF, was: Oh, darn!!!!

Subject: [OM] Strange AF, was: Oh, darn!!!!
From: "Carlos J. Santisteban" <zuiko21@xxxxxxxxx>
Date: Fri, 5 Mar 2010 17:34:25 +0100
Hi Bill (?), Ken and all,

From: "Sue Pearce" <bs.pearce@xxxxxxx>
>There is an article on new digital camera's compatability with older
lenses.
>It states that the older "OM system autofocus lenses" cannot be focused
>manually on the new E1 and E3 cameras.

Well... the ill-fated OM AF lenses (yes, those for the OM-77/88/101/707)
were impossible to focus manually -- except on the OM-88/101, but that was
"power focusing". Anyway, those lenses had a modified OM bayonet so they
won't fit on regular OM bodies, but classic Zuikos did fit the AF-OM bodies
with limited functionality. Do they fit any OM-FT adapter? and they had the
locking device on the body instead of the lens...

Ken Norton wrote:
>And unfortunately, the manual-focus OM lenses cannot be autofocused on the
>E1 and E3 cameras either.

But... do you know the Contax AX? It was a beast that could autofocus with
classic MF Zeiss/Yashica lenses -- by moving the whole
mirrorbox/shutter/film-plane!!! Not blazingly fast, but did work at late-80s
AF speed, not that bad.

A much more reasonable approach was Nikon's TC-16A -- a x1.6 teleconverter
whose elements moved back and forth thru normal AF gearing. Fits a regular
Nikon AF body, and most MF Nikon lenses -- with restrictions. As fast as the
body permitted, but focusing range was limited with long focal lengths
(about 15m with a 180mm)

Cheers,
-- 
Carlos J. Santisteban Salinas
IES Turaniana (Roquetas de Mar, Almeria)
<http://cjss.sytes.net/>
-- 
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