Re: Grease on an old microscope

On Fri, 08 Jul 2005 11:04:26 +0300, Trond Kvitvik
<dnort.kivtivk@xxxxxxxxxxx> wrote:

>I recently bought an old Reichert Zetaplan, where the focusing screw was
>so hard I had to use both hands to move it. However, using rather much
>of "sewing machine oil" It is now working fine.
>
>Also the microscope was equipped with an Apochromat 45 /0.90 Korr with a
>correction ring that was stuck. I was able to unscrew the front lens,
>remove the correction ring and make it work (I have compared it with a
>another Reichert Iris 40 / 0.90 and the performance is rather similar).
>
>The original grease was very hard and I replaced it with the "grease"
>used for lubricating a water-tap (gel-like in consistency and colour),
>since I was afraid any ordinary grease (e.g. the grease used for a
>fishing-reel) would sweat out to the glass surfaces. (I have
>successfully used this "water-tap grease" for a Nikon SLR lens focusing
>thread before, and this has worked fine for many years.)
>
>But, now I'm a bit worried still if it was the right thing to do, can
>this special "grease" meant for a totally different purpose (heat and
>water persistent), destroy the lens surfaces or the cement holding the
>lenses together? Should I try to remove as much as possible of the new
>"lubricant".
>
>Any other advises how to use (and add) grease & oil in a correct way to
>a microscope.
>
>Thanks in advance


Try to get some Zeiss Uhrenol 46. Clock watch maker oil,
000000-0117-482-000. It costs about $100 per oz. but lasts a long,
long time. AFAIK, this is the original oil used on Zeiss LM scopes.

Gary Gaugler, Ph.D.
Microtechnics, Inc.
Granite Bay, CA 95746
916.791.8191
gary@microtechnics dot com
.

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