Abstract
the effect of defocus on the resolution of two points is investigated. Rayleigh's criterion or, more accurately, a commonly used derivation from Rayleigh's criterion is used to assess resolution. It is shown that it is only meaningful to discuss resolution in terms of this criterion for certain types of illumination: for a general type, even a slight amount of defocus will give the points the appearance of having different brightnesses. Results are presented which cover all the more usual methods of illumination. With incoherent illumination in particular, resolution is found to improve with defocus.
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