CATADIOPTRIC LENS Russian patent published in 1995 - IPC

FIELD: optical instrumentation. SUBSTANCE: catadioptric lens includes single positive lens component, Manjen mirrors, secondary spherical mirror mated to second surface of lens component and four-lens compensator incorporating isolated lenses. Negative lenses of compensator are produced in the form of meniscuses facing object with concavity, positive lenses are biconvex lenses. Focal distances of negative lenses amount to (-1.1 1.9) (-1,1 - -1,9)f′ and focal distances of positive lenses lie within bounds (0.6-1.1)(0,6-1,1)f′, where f′ is focal distance of catadioptric lens. EFFECT: expanded spectral reception range. 1 dwg