61Aberrations and the Benet of Their Correction in Confocal Microscopy
4.9 Results for Aberration Measurements
at Low Numerical Aperture
e numerical aperture (NA) of a lens species the angle of the cone of rays accepted by the lens. In
general, optical systems with larger NA feature higher resolution and better light-collection eciency.
Hence they are desirable in confocal microscopy. However, systems of high NA are more susceptible to
aberrations, as we will see. Results for the case of low NA are discussed in this section whereas those of high
NA systems are discussed in Section 4.11. A comparison between the two cases is given in Sect ...
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