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

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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
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