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.
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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