Makes sense. The diaphragms I've examined appear to have few friction
points and, short of heavy use with a motor drive banging away, those points
wouldn't seem to need lubrication.
I have seen a very few lenses (no Zuikos, but a couple of Canons and
Nikkors) with the blue-black finish worn off the iris blades, revealing
white metal beneath. I've assumed that was due to heavy use. I've heard
speculation that such finish wear could contribute to internal flare or
similar problems, but don't know whether this is a legitimate concern.
-----------
Lex Jenkins
----------------------------------------------------------------------
Hoist my petard! Yoikes and away!! - Ur Amblet, 'The Very Bad Quarto'
======================================================================
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Thu, 28 Sep 2000 08:54:48 -0400
The diaphragm mechanism is assembled bone dry and should not be lubricated
at any time, no way no how.
The oil you see comes from the helicoid grease. Separation is a product of
age, usually accelerated by heat.
John Hermanson
___________________________________
Camtech, Olympus Service since 1977.
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