Abstract

Equations are given for the condition that the focal surface of a lens system remain at a predetermined position for a range of ambient temperatures. Simple methods of satisfying these equations for lens systems composed predominantly or entirely of plastic components are described.

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  1. The same problem was studied simultaneously in England at Combined Optical Industries, Ltd. See Br. Pat. 561,503.

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The same problem was studied simultaneously in England at Combined Optical Industries, Ltd. See Br. Pat. 561,503.

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