TELEPHOTO LENS WITH TWO FIELDS OF VIEW FOR THE SPECTRUM MIDDLE IR AREA

摘要

FIELD: optics.;SUBSTANCE: telephoto lens contains three components. First component first lens is the positive meniscus, the second one is the negative meniscus, facing the image with concavity, behind which the second component is located, installed with possibility of input-output from the optical path, which first lens is the biconcave lens, and the second one is the biconvex lens. In the first component, behind the second component the negative meniscus facing the image with convexity, and positive meniscus facing the object with concavity are arranged, and mounted with possibility of movement along the optical axis. Third component contains the negative meniscus, facing the image with concavity, the biconvex lens and the positive meniscus, facing the image with concavity.;EFFECT: development of the telephoto lens with the focal length large value, its change large multiplicity, and having increased manufacturability with high image quality.;1 cl, 7 dwg, 1 tbl