The Oblique Aberrations
In Chapter 4 we introduced the subject of the oblique aberrations of a lens, and in Chapter 8 discussed in detail the origin and computation of coma. In this chapter we continue the discussion, giving computing procedures for the remaining oblique aberrations, namely, astigmatism, field curvature, distortion, and lateral color.
11.1 ASTIGMATISM AND THE CODDINGTON EQUATIONS
When a narrow beam of light is obliquely incident on a refracting surface, astigmatism is introduced, and the image of a point source formed by a small lens aperture becomes a pair of focal lines, a series of beam sections being indicated in Figure 11.1. One focal line (sagittal) is radial to the field and points toward the lens axis, while the ...
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