Abstract

The method of least squares which permits the simultaneous variation of a large number of design parameters, has been adapted for use with the Weizmann Institute of Science electronic digital computer. The minimization process is iterated until a satisfactory solution is obtained.

Two programs are described, for the correction of third-order aberrations and of residual aberrations, respectively. The time required to complete one iteration is 0.5 sec per surface per parameter for the first program, the corresponding time for the final correction being 3.5 sec.

Examples of actual applications of the method for the correction of a Cooke triplet and of a Tessar system are presented.

© 1959 Optical Society of America

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