HIGH-SPEED WIDE-ANGLE LENS WITH OUTSIDE ENTRANCE PUPIL Russian patent published in 1994 - IPC

FIELD: optical instrumentation engineering. SUBSTANCE: high-speed wide-angle lens with outside entrance pupil integrates three components: first one - negative cement from negative and positive meniscuses facing space of object with concavity, second one - positive cemented from biconvex lens and negative meniscus facing object with concavity, third one-positive meniscus. Moduli of curvature radii of surfaces are found from relation given in description of invention. EFFECT: improved reception of visual information. 7 dwg, 1 tbl