Abstract: A double reflector system is described which comprises two spaced apart primary mirrors oriented toward a common focus. The optical system further comprises two separate secondary deflector mirrors as well as tertiary deflector mirrors for beam concentration on a common focus. The optical system is housed in an elongate casing having coaxial bearing support cylinders at its opposite ends which define an axis of elevation, and the casing is hydrostatically supported in part on a circular tray which is in turn hydrostatically and rotatably supported upon a stationary bed. A support ring is disposed concentrically about the tray, and the support ring includes bushings which receive the bearing cylinders of the casing and thus also support in part the weight of the casing. The support ring and the tray are independently rotatable in a horizontal plane, and the casing is rotatable by a separate drive about the axis of elevation.

Abstract: A reflecting telescope is described, in which the surface of the primary mirror is in the form of a pitch circular surface of a hypothetical, rotationally symmetrical large mirror. The optical axis parallel to the incident optical path and the focal point of the primary mirror and the large mirror are consequently identical. The primary mirror or pitch circular surface are located alongside the optical axis, so that all the optical and mechanical aids to be arranged in the vicinity of the focal point can be located outside the light incidence area and the reflection field, without optical correcting means being required.