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.
When I've rebuilt lenses I use dry molybdenum disulphide powder on the
diaphragm blades and actuating mechanism - no oil. Work it into the moving
parts then blow the excess out. Moly is also available in other carriers -
grease or a solvent-based carrier that evaporates after carrying the moly
into crooks and nannies.
I have no idea whether this is acceptable industry practice or even good
practice. It's worked for me. I just applied the same logic and techniques
I learned from maintaining my own spring piston airguns, where moly has
proven effective in preventing wear in metal-to-metal contact surfaces.
(I'm really not trying to invoke digression, just citing where my method
originated).
-----------
Lex Jenkins
-------------------------------------------------------------
Why are they called fanny packs when we use 'em as codpieces?
=============================================================
From: DAVDOU9211@xxxxxxx
Date: Wed, 27 Sep 2000 17:36:34 EDT
...having never seen a lens
with oily aperture blades, where does the oil come from?
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