Using an unknown grease may work at first but may cause problems sometime
down the road.
John Hermanson
___________________________________
Camtech, Olympus Service since 1977.
21 South Lane, Huntington NY 11743-4714
631-424-2121 http://www.zuiko.com
Free Olympus Manuals: 1-800-221-3000
___________________________________
----- Original Message -----
From: "Lex Jenkins" <lexjenkins@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Sunday, October 15, 2000 8:48 PM
Subject: Re: [OM] Helicoid lubricant
| I'll bet John Hermanson will join in advising against this sort of
approach.
| There's a delicate balance between grease that has sufficient body to
| prevent migration in normal use, while providing lubricity and ease of
| movement. IOW, don't mess with solvents or thinners. They'll wind up
| exactly where you don't want 'em - on the iris and lens elements.
|
| Another factor is understanding the purpose of grease in a mechanism - it
| isn't always for lubrication. Sometimes it's there to reduce vibration
| (typical of spring-piston airguns). I suspect that the purpose of grease
in
| focus and zoom mechanisms is primarily to provide damping and "feel", less
| so for lubrication, particularly in well designed and fitted parts that
are
| essentially self-lubricating (brass against steel, for example) and are
| subject to relatively little wear anyway. Grease can also be used to
| exclude contamination from dirt and abrasives, something many of us know
who
| did our own bicycle repairs years ago before sealed bearings were common.
| Grease that was too thin might provide better lubricity, but at the cost
of
| poor exclusion of grit.
|
| Are you sure your lenses aren't worth the expense of doing it right? Even
| if it's just a 50/1.4, there's no guarantee that a replacement would have
| exactly the optical characteristics that you like in your particular lens.
|
| Anyway, that's how I justified spending a hunnertfifty bux on a CLA and
| meter repair for my Can-not-an-OM-on FTbn a few years ago. Just couldn't
| get rid of an old friend.
| -----------
| Lex Jenkins
| ----------------------------------------------------------------------
| "Budda-budda-budda!!!" - Sgt. Rock
| ======================================================================
| >From: Morgan Sparks <msparks@xxxxxxxxxxxx>
| >Subject: [OM] Helicoid lubricant
| >Date: Sun, 15 Oct 2000 10:20:38 -0400
| >
| >...I'm wondering if there's some way to
| >loosen up some of my stiff-focusing lenses. It seems like any lubricant
| >should have a proper thinner/solvent...Or, can a compatible grease be
| >dabbed on the threads and "worked in"?
| >I'm trying to avoid disassembly and cleaning, which isn't economically
| >justified for these lenses.
| >
|
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