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Effect of the aperture–lens separation on the focal shift in large-F-number systems

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Abstract

We treat the problem of a coherent spherical wave passing through a circular aperture and subsequently focused by a lens. Using the Huygens–Fresnel integral representation, an expression is derived for the axial intensity beyond the lens. It predicts that the large-F-number focal shift may be reversed or eliminated, depending on the aperture–lens separation.

© 1987 Optical Society of America

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