It's also possible long tab on coupling ring is slightly bent, so when
lens is at 1:2, error is the greatest and tab slips off the other lever.
___________________________________
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
C.H.Ling wrote:
> Talking about the aperture mechanism, my 90/2 just have aperture coupling
> lever disengaged after some 1:2 shots, it was the second time, it seems that
> the aperture coupling lever is a bit too short when the lens extended to
> maximum. Together with the space require for coupling ring/stop down ring
> movement, the aperture lever sometimes went out of position.
>
> C.H.Ling
>
> ----- Original Message -----
> From: "John Hermanson"
>
>> I often put a dot of rubber cement on spring ends. They are often just
>> a loop hooked through a hole.
>>
>> 90 f2 diaphragm could become sluggish due to oil in the coupling ring.
>> It's a big ring and imo should have been designed with some ball
>> bearings (same goes for 100 f2).
>> ___________________________________
>
--
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