Abstract

Hopkins’ treatment of tolerance theory shows that, in designing quality optical systems, we should aim at minimizing the variance K of the wave-aberration difference function. Since the value of K is essentially positive, a useful criterion for the whole field is the sum of the suitably weighted values of K for a typical set of image points, corresponding to a range of selected values of spatial frequencies s and azimuths ψ. In this paper we show that the variance K (for both the axial and the extraaxial images) may be calculated by means of a set of universal coefficients P(i,j;s),Q(i,j;s,ψ) and R(i,j;s,ψ) once the wave-aberrations of certain rays are known. The values of these coefficients are uniquely determined by the function of the wave-aberration polynomial assumed and by the pattern of rays traced. Examples of the coefficients are presented.

© 1968 Optical Society of America

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