There's a good chance that the spring has unhooked. You may be able to
fix it yourself by removing the rear mount and doing a close inspection.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
Dawid Loubser wrote:
> Hi all (especially, I am hoping, John...)
>
> This morning my 90/2.0 Macro developed a worrying problem - it's
> behaving as if the
> aperture stop-down lever is pressed in all the time, i.e. aperture
> diaphragm is always
> closed to the set aperture.
>
> Upon further investigation, if I move the stop-down lever which the
> body actuates to stop
> down the lens, it moves freely with no spring resistance, and thus
> does not snap back
> after being stopped down. In all other respects, aperture is smooth,
> non-oily, and non-sticky.
>
> So, I figure some spring has either jumped off or snapped. My problem?
> I am all the way out
> here in South Africa, and not easily able to send to John in the
> sates. Also, I absolutely
> need my lens for a shoot this coming week-end.
>
> The question: I am quite technically sufficient at disassembling
> fairly lenses/cameras, how difficult
> is it to get to the aperture mechanism for me to see what's going on?
> Also, I have access to an old
> master camera repairman who is amazing - he just did a full Leica M3
> rebuild for somebody else - but
> he has not worked much on OM lenses.
>
> Is there anything special I need to know before either I or he
> attempts to disassemble the lens? Or
> is this murder, and I should use it in stop-down mode until I can send
> it to John?
>
> thanks,
> Dawid
>
--
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