Actual field curvature and isoquals

David Vaughnn; Robert Mark

doi:10.1117/12.681436

31 August 2006 Actual field curvature and isoquals

David Vaughnn, Robert Mark

Proceedings Volume 6288, Current Developments in Lens Design and Optical Engineering VII; 62880E (2006) https://doi.org/10.1117/12.681436
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

Citation Download Citation

David Vaughnn and Robert Mark "Actual field curvature and isoquals", Proc. SPIE 6288, Current Developments in Lens Design and Optical Engineering VII, 62880E (31 August 2006); https://doi.org/10.1117/12.681436

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KEYWORDS

Monochromatic aberrations

Diffraction

Image quality

Wavefronts

Modulation transfer functions

Spatial frequencies

Optical design

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