WIDE-ANGLE FAST LENS Russian patent published in 1998 - IPC

FIELD: moving picture equipment. SUBSTANCE: wide-angle fast lens has two components separated by aperture diaphragm. First component includes negative meniscus, biconvex lens, negative meniscus, biconvex lens, positive meniscus, two negative menisci, and biconvex lens positioned in succession. Second component consists of biconvex lens, biconcave lens, positive double-lens meniscus, and two biconvex lenses. Thirteen-component lens has the following technical data: relative aperture of 1:1.2, field of vision of 84 deg. , relation of S' to F' equal to 2.34, where S' is rear section of lens and F' is lens focal distance. EFFECT: increased aperture ratio and extended field of vision of lens with simultaneous enlargement of rear focal section. 1 tbl, 3 dwg