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Re: [OM] Re Oil on Aperture Blades

Subject: Re: [OM] Re Oil on Aperture Blades
From: Andrew Fildes <afildes@xxxxxxxxxxxxxx>
Date: Thu, 28 Sep 2000 12:36:06 +1100
This one always appears on "How to Buy Lenses" advice - check for oil on
diaphragm. I suspect it's the result of inept repairs. Some advise not to
store lenses upright as it can cause 'pooling' of internal lubricants on
diaphragms (careful - unintentional OT humour alert).
Andrew

>I don't know where oil on the diaphragm is liquified grease that's migrated
>from the focusing helix to the blades, or is a separate oil applied to the
>diaphragm acutating mechanism that went astray.  When I've looked at some
>lenses closely it appears to be a separate oil that migrated.




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