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Spherical Aberration: Further Fascinating Observations

In January 1987 we presented a paper "Spherical aberration - some fascinating observations."1 In that paper we presented a parametric analysis of f/2, one through four element lenses, relating monochromatic axial performance (spherical aberration) to refractive indices from 1.5 to 2.0. In this paper we extend our prior work to include parametric analyses relating the same one through four element lenses over the same refractive index range to the sensitivity to element decentration. In this paper we will review the prior paper for continuity in addition to the new material.