Materials suitable for the construction of achromatic lenses corrected for four wavelengths are selected by the use of three graphs which are the three orthographic projections of a three-dimensional graph in P, Q, and V; where V=(nd−1)/(nF−nC), P=(nh−nC)/(nF−nC), and Q=(n1.014−nC)/(nF−nC). One set of three glasses, Schott PKS-1, F-1, and KzFS-4, has been selected, from which a four-color achromat has been designed. Analysis at 12 wavelengths shows this design to have negligible residual chromatic aberration. It is consequently a superchromat in accordance with Herzberger’s prediction.
© 1960 Optical Society of America
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