Image Defects Useful In Teaching Students

R. Barry Johnson

doi:10.1117/12.940197

10 June 1987 Image Defects Useful In Teaching Students

R. Barry Johnson

Proceedings Volume 0766, Recent Trends in Optical Systems Design and Computer Lens Design Workshop; (1987) https://doi.org/10.1117/12.940197
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

In the early stages of teaching students the subject of lens design, the author has found it useful to present the concept of image defects in a form which relates the aberration polynomial terms to specific ray intercept data. The normal development of exact ray intercept errors (εx,εy) as a power series in terms of the canonical coordinates (ρ,θ,H,ε) following Buchdahl is in general observed to be theoretically pleasing. Students often find it difficult, however, to quickly grasp the physical interpretation of the numerous aberration coefficients. On the other hand, they seem to readily visualize the concept of real ray intercept deviations from the ideal image point. By expressing the actual ray intercept error at the image plane as additive contributions, it has been found illustrative to show how ray intercept data from a few selected trigonometrically-traced rays can be utilized to compute these contributions including explaining how to identify the oblique spherical and higher-order coma portions of the astigmatic and comatic error contributions. The necessity for including ray-trace data not in either the tangential or sagittal planes [e.g., (ρ,θ,H,ε)=(ρ,45°,H,ε)] to assure that all aberration coefficients are accounted for is also discussed.

Citation Download Citation

R. Barry Johnson "Image Defects Useful In Teaching Students", Proc. SPIE 0766, Recent Trends in Optical Systems Design and Computer Lens Design Workshop, (10 June 1987); https://doi.org/10.1117/12.940197

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