Similar to a 90 f2 or 100 f2 on a 4T. The coupling lever inside the body
(which stops the lens down) hits the back of the lens in some way, jamming
camera.
_________________________________
John Hermanson www.zuiko.com
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 For Free Olympus manuals,
please call 1-800-221-3000
_________________________________
----- Original Message -----
From: "Curtis P. Hedman" <Curtis.P.Hedman-1@xxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Saturday, August 24, 2002 9:36 AM
Subject: [OM] OM Mount Change?
> Another technical question for the List...
>
> I just received an OM-2n (thanks to Matt Crawley) and a Vivitar 90mm 1:1
> macro (via Bill Barber), and have discovered a curiosity: there seems to
be
> some sort of interference between the protruding collar at the back of the
> lens and the innards of the OM-2n mount, but the lens mounts just fine on
> my OM-2s (as well as a Vivitar 3X converter). I also have a 55mm Vivitar
> 1:1 macro (again courtesy of Matt Crawley) which has a similar collar
> protruding into the body, and it mounts just fine on the -2n. I did some
> measurements, and found that the 55mm lens collar is actually slightly
> deeper, but the 90mm collar has a larger diameter. Hence my theory is that
> Olympus made a slight revision to the mount design between the -2n and the
> -2s to give a slightly larger clear zone for protruding rear elements,
etc.
> The other possibility is that there are normal tolerance variations at
play
> here, and the two bodies I tried the lens on are at opposite ends of the
> spec range...
>
> So has anyone had similar experiences? How about actual dimensional data
on
> the OM mount and the clear zone behind it? This sort of thing always makes
> me curious, beyond the normal questions of utility of the lens, quality,
> etc. - I like the lens (going all the way to 1:1 is convenient) and plan
to
> restrict its use to the -2s, but inquiring minds want to know....
>
> Curt
>
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