Abstract: A gyro stabilized optical radiation deflection device which provides a radiation sensitivity lobe which is stabilized against angular motions of the envelope in which the radiation is received or transmitted. Such device consists of a ball-shaped gyro rotor rotating about a spin axis and which is seated in a spherical recess in a support which is fixedly connected to the envelope. The central portions of the rotor and recess, through which the radiation is transmitted, are prisms which are transparent to the radiation. Such prisms together form an adjustable diffraction prism which serves as an optical wedge for directing the radiation in a directive sensitivity lobe, such direction being determined by the angle between a planar wall of the rotor prism and a planar wall of the recess prism.