Abstract: A beam steering mechanism for deflecting a light beam along any selected azimuth and elevational direction. The beam is movable without limitation about a pan axis and about a tilt axis, by drive motors that are rigidly mounted to a housing and are not bodily moved with the light beam. Movement about the pan axis is effected by rotation of a first mirror mounted in a first rotatable cylinder. Movement about the tilt axis is effected by rotation of a second mirror mounted in a second cylinder that is panned with the first cylinder and is itself mounted for rotation about the tilt axis.