RE: Objective cleaning.

From:Gary Gill


I'm familiar with this technique.  It was introduced in a Leitz technical
bulletin many years ago.  I have a copy in my files at home.


-----Original Message-----
From: J. A. Kiernan []
Sent: Wednesday, February 26, 2003 12:24 PM
To: Gary Gill
Cc: 'Ian Montgomery';
Subject: Re: Objective cleaning.

A method for getting oil off an objective is
to take a piece of expanded polystyrene (the
popcorn-like stuff used for packing), break it
in half, and place the lens against the newly
broken surface. Almost all the oil is rapidly
soaked up by the polystyrene. I got this from
a book: Light Microscopic Techniques in Biology
and Medicine by J. James; The Hague: Martinus
Nijhoff, 1976.  It works well.

                           John Kiernan.

Gary Gill  wrote:
> Regardless of the solvent used, never put it directly onto a lens surface,
as it may seep around the lens circumference and loosen the cement that
holds the lens in place.
> Instead, first put a drop or two of cleaner on a double thickness of lens
tissue and then clean the lens.  For recessed concave surfaces of plano
lenses, use a sharpened bamboo stick to press on the moistened lens tissue
and move it over the lens surface.  Move to a dry area of lens tissue, and
thoroughly dry the residual fluid to avoid spotting that can make the lens
dirtier than it was initially.  
> Use an inverted eyepiece as a jeweler's-like loupe to inspect the lens
before cleaning, so you'll know what you're dealing with, and after cleaning
to confirm that you've accomplished what you intended.
John A. Kiernan
Department of Anatomy and Cell Biology
The University of Western Ontario
London,   Canada   N6A 5C1

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