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Microscope objective questions. What does the xx/- yy/zz mean?

Ramsey
in Biochemistry and Molecular Biology

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Consider Leitz Wetzlar 10/0.25 170/- objective lens.

 

I guess 10 is the magnification? But what are the 0.25, 170 and "/-" things?

 

Eg., for Leitz Wetzlar 40/0.65 170/0.17 we have "170/0.17" instead of "170/-" as above.

Can't find any info/FAQ via googling.

Edited by Ramsey

the 0.something is the numerical aperture - from which focal length can be determined (don't know the exact conversions off hand).

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