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Re: [OM] Zuiko 90/2.0 Macro diaphragm spring died??

Subject: Re: [OM] Zuiko 90/2.0 Macro diaphragm spring died??
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 23 Jun 2009 08:35:17 -0400
How about sending it to Mark so he can put it up on his site?  I wonder 
if anything else is missing there?

Chuck Norcutt

John Hermanson wrote:
> I made up a parts pdf from my paper copy of the 90 f2.  If anyone wants 
> it, send me a private email and I'll attach it to the reply.
> ___________________________________
> 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
> 
> 
> Fernando Gonzalez Gentile wrote:
>> Just noticed the 90/2 is not listed at Mark's site ... no exploded 
>> diagram !?
>> Could be listed there, and I might have overlooked the link ... :-(
>>
>> Fernando.
>>
>> *http://tinyurl.com/lspxuz
>>
>>
>> *
>> John Hermanson wrote:
>>> 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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