Abstract

A new Cooke triplet derivative of a five-element configuration is proposed, in which both the front and the rear lenses of the triplet are split into two separated positive lenses. The designs of this new lens and the conventional Pentac lens have been developed for use as a 35-mm camera lens under identical conditions. The performance of the two lens systems is compared, and it is found that the aberrations of the new lens system are better corrected.

© 1979 Optical Society of America

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