Ramsey Posted December 7, 2010 Share Posted December 7, 2010 (edited) 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 December 7, 2010 by Ramsey Link to comment Share on other sites More sharing options...
Greippi Posted December 7, 2010 Share Posted December 7, 2010 the 0.something is the numerical aperture - from which focal length can be determined (don't know the exact conversions off hand). Link to comment Share on other sites More sharing options...
CharonY Posted December 7, 2010 Share Posted December 7, 2010 Magnification/numerical aperture; mechanical tube length/cover glass thickness (for higher NA) Link to comment Share on other sites More sharing options...
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