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===Numerical aperture=== | ===Numerical aperture=== | ||
NA = numerical | NA = numerical aperture. | ||
General formula for NA:<ref>URL: [http://en.wikipedia.org/wiki/Numerical_aperture http://en.wikipedia.org/wiki/Numerical_aperture]. Accessed on: 21 January 2011.</ref><br> | General formula for NA:<ref>URL: [http://en.wikipedia.org/wiki/Numerical_aperture http://en.wikipedia.org/wiki/Numerical_aperture]. Accessed on: 21 January 2011.</ref><br> | ||
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#Any specimen on stage. | #Any specimen on stage. | ||
#Focus. | #Focus. | ||
# | #Adjust field aperture (bottom) - to obscure periphery of field of view (FOV). | ||
#Raise or lower condenser until field | #Raise or lower condenser until field aperture diaphragm clearly focused. | ||
#+/-Center 'field | #+/-Center 'field aperture diaphragm - using condenser centering screws. | ||
==See also== | ==See also== |
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