Abstract
The paper is based on some unpublished notes of a study made by the late R. K. Luneburg on the third-order design of air-spaced triplets. It has been found that the approach lends itself to any desired degree of automation, but still may be used to provide an insight into the effects of the parameters, including choice of glass. Differential change techniques may readily be applied in balancing third against higher orders. While special attention is given to the conventional Cooke triplet, the study is sufficiently general to cover negative equivalent focal lengths or virtual images.
© 1964 Optical Society of America
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