Maybe something to do with the aperture ring becoming uncoupled from the
rest of the lens when racked out to 1:2? With the double helicoid on the
90/2, sometimes I have heard of that happening when it's fully extended, the
linkages get buggered and mis-aligned.
Just a thought.
On 6/22/11 6:16 AM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
> Re: [OM] m43 adapter
> To: olympus@xxxxxxxxxxxxxxxxx
> Message-ID: <4E00FC44.50608@xxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Thanks for the input. Yes, I'd guess that Olympus version of the
> adapter would have steel front mount, might as well be from OM-1.
>
> Why I asked: a new customer is using his 90mm f2 Zuiko on an m43
> adapter. He says that when the lens is focused all the way out to 1:2,
> he stops the lens down to any small aperture and then hears a "click"
> inside the lens. When the lens is focused back, the diaphragm ring
> turns, but stop down button / tab on back of lens are no longer linked
> to the diaphragm. Customer is in France, lens has been to a repair shop
> in Italy several times, now I have it. I wanted to see if m43 adapter
> could be linked to this problem in any way, but all it's doing is
> holding the lens stopped down.
--
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