27 August 2005 f/No. and the radiometry of image forming optical systems with non-circular aperture stops
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Proceedings Volume 5867, Optical Modeling and Performance Predictions II; 586701 (2005); doi: 10.1117/12.611564
Event: Optics and Photonics 2005, 2005, San Diego, California, United States
Abstract
The f/No. concept is extended to include image forming optical systems with non-circular aperture stops. The basic principles of classical radiometry, geometrical optics, and physical optics are described by a single simple formula that is used to derive f/No. definitions which account for effects from diffraction, aberrations, and arbitrary stop shapes. In general, the effective f/No. of an optical system is a strong function of stop shape if the stop is very narrow in one or more dimensions, with equivalent circular stop areas of f/No. 0.5 to 1. Practical methods for computing the effective f/No. are discussed.
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Ronian H. Siew, "f/No. and the radiometry of image forming optical systems with non-circular aperture stops", Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 586701 (27 August 2005); doi: 10.1117/12.611564; https://doi.org/10.1117/12.611564
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KEYWORDS
Point spread functions

Diffraction

Radiometry

Geometrical optics

Imaging systems

Optical imaging

Zemax

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