FAST LONG FOCAL-LENGTH LENS Russian patent published in 1994 - IPC

FIELD: optical instrumentation. SUBSTANCE: fast long focal-length lens has first collecting component composed of biconvex and biconcave lenses cemented together, aperture diaphragm, second component incorporating biconvex lens and negative meniscus cemented together, third component made in the form of biconcave lens, fourth cemented component having cementing radius facing spatial image with concavity and including collecting meniscus and biconvex lens, fifth negative component integrating negative meniscus and facing space of objects with concavity and sixth component in the form of negative meniscus facing space of objects with concavity. EFFECT: improved optical characteristics. 2 dwg, 1 tbl