f/No. and the radiometry of image forming optical systems with non-circular aperture stops

Ronian H. Siew

doi:10.1117/12.611564

26 August 2005 f/No. and the radiometry of image forming optical systems with non-circular aperture stops

Ronian H. Siew

Proceedings Volume 5867, Optical Modeling and Performance Predictions II; 586701 (2005) https://doi.org/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.

Citation Download Citation

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 (26 August 2005); https://doi.org/10.1117/12.611564

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available