RE: Objective cleaning.
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.
thanks for the information and suggestions. Yesterday afternoon I searched my
books and last night trawled through the internet searching for information.
Savile Bradbury in his Introduction to the Optical Microscope recommends
absolute alcohol. Ether, mixtures of ether and alcohol, xylene, various
proprietary cleaners and isopropyl alcohol (propan-2-ol) are all used. I'm
swaying towards the isopropyl alcohol but before I commit myself I'll contact
Zeiss. Anyone had any experience with isopropyl alcohol?
Graham Kerr Building,
Biomedical & Life Sciences,
University of Glasgow,
Tel: 0141 339 8855
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