Abstract: A device for taking long-distance images includes, successively: a catadioptric optical system and an optical system to shape the beam positioned close to the first image generated by the catadioptric system, which adjusts the exit aperture of the catadioptric system on a second image of the aperture in an image space of a variable focal length optical system. The catadioptric optical system and the optical system to shape the beam generates a third image of the observed scene. A focal plane is superposed over an image plane of the catadioptric optical system and the optical system to shape the beam. A projection lens receives the light beam output by the variable focal length system and forms a fourth image of the observed scene at the focal plane of the projection lens. An image sensor is positioned at the focal plane of the projection lens.

Abstract: A device for taking long-distance images includes, successively: a catadioptric optical system and an optical system to shape the beam positioned close to the first image generated by the catadioptric system, which adjusts the exit aperture of the catadioptric system on a second image of the aperture in an image space of a variable focal length optical system. The catadioptric optical system and the optical system to shape the beam generates a third image of the observed scene. A focal plane is superposed over an image plane of the catadioptric optical system and the optical system to shape the beam. A projection lens receives the light beam output by the variable focal length system and forms a fourth image of the observed scene at the focal plane of the projection lens. An image sensor is positioned at the focal plane of the projection lens.

Abstract: A device for taking long-distance images includes, successively: an assembly, formed of spherical mirrors, having a first focal length, an optical relay assembly designed to render afocal the optical combination of this optical relay assembly and the assembly of spherical mirrors, a lens unit and an image sensor placed in the focal plane of the lens unit; the optical relay assembly being designed, for at least one focal length of the lens unit, to form the image from the exit aperture of the assembly constituted of mirrors on the entrance aperture of the lens unit. Preferably, the optical relay assembly is designed to form an image from the exit aperture of the spherical mirrors assembly in the entrance aperture of the lens unit.