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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: Fernando Gonzalez Gentile <fgnzalez@xxxxxxxxxxxxx>
Date: Mon, 22 Jun 2009 11:14:10 -0300
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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