FIELD: optical instrument engineering. SUBSTANCE: fast lens has the first positive lens, the second negative meniscus, which is turned with its concavities to the image. Thickness of the meniscus is equal to 0,22 focal length of the lens with 10% precision. Lens also has aperture diaphragm, the first negative meniscus, the second positive meniscus and biconvex lens which is glued of positive and negative lenses. EFFECT: improved reliability of operation; improved precision. 6 dwg
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