Diaphragm ring could be out of round, coupling tab on back of lens could be
bent.
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John Hermanson www.zuiko.com
mail: omtech@xxxxxxxxx
Camtech Photo Services, Inc.
21 South Lane, Huntington NY 11743-4714
631-424-2121
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----- Original Message -----
From: "Bernard Frangoulis" <lists@xxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Friday, April 09, 2004 7:31 AM
Subject: [OM] Problem with 24/2.8 diaphragm ring
> My 24/2.8 (one of my preferred Zuikos) has developed a small problem:
> when I turn the diaphragm ring from the smaller (16) to the higher
> (2.8) aperture, the ring does not run smoothly, a kind of resistance
> can be felt, and a cringing noise is heard when it passes the 4 ->
> 2.8 mark.
>
> Curiously, no problem at all when I turn the ring in the other
> direction. Also, the problem only occurs when the lens is mounted (on
> an OM-4Ti), not when it is unmounted. This is the only lens to
> display this behaviour.
>
> What could be wrong? The "actuator" lever (which thransmits the
> aperture to the camera, I guess) does not appear to be bent or
> damaged. The diaphragm closes normally at all apertures (at least
> when the lens is unmounted), and the speed indicated in the
> viewfinder varies according to the diaphragm selected, whatever the
> direction I turn the diaphram ring.
>
> Bernard
>
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