TELESCOPE WITH DISCRETE CHANGE OF MAGNIFICATION FOR FAR-FIELD OR REGION OF SPECTRUM Russian patent published in 2003 - IPC

FIELD: optics. SUBSTANCE: telescope includes objective lens and eye-piece. Objective lens comprises three components, first component being positive meniscus facing object with convexity, second component being made up of biconcave lens and two positive meniscuses ( one facing image with convexity, another one facing object with concavity ), third component being negative meniscus facing image with concavity. Second surface of lens of first component is aspherical. Second component of objective lens is mounted for input and output of optical circuit. Eye-piece includes two positive meniscuses, one meniscus facing image with convexity and the other meniscus facing object with convexity. First surface of first lens of eye-piece is aspherical. Positive meniscus facing image with convexity is inserted into eye-piece in front of first meniscus. Air gaps between lenses of eye-piece and its focus meet relations specified in formula of invention. EFFECT: magnification multiple of three as minimum and attenuation of glares from surface of telescope lenses are secured with good quality of image. 6 dwg, 2 tbl