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Re: [OM] Oily 300/4.5. Suggestions?

Subject: Re: [OM] Oily 300/4.5. Suggestions?
From: Chris Crawford <chris@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 29 May 2009 15:03:34 -0400
I'd always wondered if the 35-105 had been made by someone else. It didn't
quite look like a real Olympus lens. The ring you turn to put it in close
focus mode looks like something from an off brand lens.


-- 
Chris Crawford
Fine Art Photography
Fort Wayne, Indiana
260-747-5101

http://www.chriscrawfordphoto.com  My portfolio

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On 5/29/09 8:53 AM, "John Hermanson" <omtech1@xxxxxxxxxxx> wrote:

> Even if the front group unscrews easily (and it may), it's still a big
> job. The diaphragm plate has to come completely apart and all parts
> degreased.
> 
> At least the plate has 3 screws holding it all together when you drop it
> back in.  That is what tipped me off that the 35-105 zoom is definitely
> not Olympus built.  The only screws holding all the blade parts in are
> the 3-4 screws that hold the blade assembly into the barrel. You have to
> get all the blades in place, put the cover plate on (no screws holding
> it on), set it all on top of a large diameter dowel and lower lens
> barrel down around it.  Align it with holes in the barrel and get screws
> in before the blades fall out.
> ___________________________________
> 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
> 
> 
> Chuck Norcutt wrote:
>> Thanks for the warning.  Sounds tough.
>> 
>> Chuck Norcutt
>> 
>> John Hermanson wrote:
>>> Remove front lens assembly, remove mount.  There are (I think) 4 screws
>>> accessible from the back that hold the diaphragm assembly plate in.
>>>  From the front, diaphragm cam, and some springs and levers may have to
>>> come out first.  The hardest part MAY be simply unscrewing the from
>>> group.  No set screws, just that many appear to be glued in.  Even in
>>> the 80s, I watched Japanese techs (with 300/4.5 in a full size vice)
>>> with giant spanners trying to unscrew the front tube.  It never budged
>>> even after liquid wrench, alcohol, acetone, every solvent under the sun
>>> was applied.  Spanner eventually broke.  Not really a do it at home job.
>>> ___________________________________
>>> 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
>>> 
>>> 
>>> Chuck Norcutt wrote:
>>>> Anyone have suggestions for disassembly of the 300/4.5 to clean up an
>>>> oily diaphragm?  Someone I know (not on this list) has one and asked if
>>>> I had any tips for cleaning it.  I gave him the parts list and exploded
>>>> assembly diagram and an old note from Clint that says the whole
>>>> diaphragm cage is to be removed as an assembly.  But Clint's note didn't
>>>> say anything about the best way to get in.
>>>> 
>>>> Chuck Norcutt


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