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Proceedings Paper

f/No. and the radiometry of image forming optical systems with non-circular aperture stops
Author(s): Ronian H. Siew
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Paper 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.

Paper Details

Date Published: 27 August 2005
PDF: 10 pages
Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 586701 (27 August 2005); doi: 10.1117/12.611564
Show Author Affiliations
Ronian H. Siew, Thales Electro-Optics Pte. Ltd. (Singapore)


Published in SPIE Proceedings Vol. 5867:
Optical Modeling and Performance Predictions II
Mark A. Kahan, Editor(s)

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