Abstract

If two thin lens elements of two different glasses are combined into a thin two-element system, then the chromatic properties of the system may be described by the effective values of V [V=(N−1)/(N_F−N_C)], and P [P=(ΔN/N_F−N_C)]. The effective value, $\overline{P}$, is a linear function of $\overline{V}$. On a graph of P versus V, the straight line drawn through the points for two glasses is the locus of all possible effective values of V and P for combinations of these two glasses. By means of such a graph the effective value $\overline{P}$ for a combination of two glasses may be matched to P of a third glass whose V differs from $\overline{V}$ by a useful amount. An achromatic lens system of the three glasses may then be computed, which will have a common focal length for three wavelengths.

© 1959 Optical Society of America

Four-Color Achromats and Superchromats

Robert E. Stephens
J. Opt. Soc. Am. 50(10) 1016-1019 (1960)

Selection of Optical Glasses in Taylor Triplets (General Method)

N. v. d. W. Lessing
J. Opt. Soc. Am. 49(1) 31-34 (1959)

Selection of Optical Glasses in Taylor Triplets with Residual Longitudinal Chromatic Aberration

N.v.d.W. Lessing
J. Opt. Soc. Am. 49(9) 872-874 (1959)

Achromatic Combinations of Half-Wave Plates

Charles J. Koester
J. Opt. Soc. Am. 49(4) 405-409 (1959)

Machine-Aided Selection of Optical Glasses for Two-Element, Three-Color Achromats

R. R. Willey
Appl. Opt. 1(3) 368-369 (1962)