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The influence of defocusing on the resolution of rotationally symmetric optical systems apodized by the shaded aperture amplitude filters has been studied by applying the modified Sparrow criterion introduced by Asakura to suit the case of unequally bright object points. The results are presented in terms of Sparrow limits obtained for coherent, partially coherent and incoherent illuminations. It is found that for certain cases of illumination, the presence of defocusing leads to an improvement in resolution.
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