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Proceedings Paper

Actual field curvature and isoquals
Author(s): David Vaughnn; Robert Mark
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Paper Abstract

For the purpose of this paper, actual field curvature is the field dependent departure of the location of best image quality from a nominal surface along the direction of the optical axis. Usually this nominal surface is a plane where an image is formed and acquired. To the extent that location of best focus is displaced from it, the image is degraded due to defocus. Because the departure follows a curve in general, image quality over the field of view is compromised. Various image quality metrics can be used to calculate actual field curvature. These can also be used to generate contours of equivalent image quality, or isoquals, which are orthogonal to actual field curvature. This yields a solid method for evaluating how good the image quality of an optical system must be. It also yields a method for gaging geometric image quality versus diffraction and spawns new definitions for diffraction limited image quality.

Paper Details

Date Published: 31 August 2006
PDF: 13 pages
Proc. SPIE 6288, Current Developments in Lens Design and Optical Engineering VII, 62880E (31 August 2006); doi: 10.1117/12.681436
Show Author Affiliations
David Vaughnn, Rudolph Technologies, Inc. (United States)
Robert Mark, Univ. of Minnesota (United States)


Published in SPIE Proceedings Vol. 6288:
Current Developments in Lens Design and Optical Engineering VII
Pantazis Z. Mouroulis; Warren J. Smith; R. Barry Johnson, Editor(s)

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