Abstract

The significance of proper selection of Petzval curvature P in the Cooke triplet design has been investigated. Seven triplet systems at 100 mm, f/5.0 for a 35-mm camera, have been designed for seven different values of P (0.0037−0.0002−0.0049), and their performances are evaluated and compared. It is observed that the performance of the triplet does not vary linearly with the value of P. The triplet designed with a value of P = 0.0043 gives the best performance. Its performance deteriorates rapidly for designs developed with P values lying on either side of this optimum value.

© 1982 Optical Society of America

Utility of low-index high-dispersion glasses for Cooke triplet design

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