Abstract: An articulated coupler which, when inserted between an endoscope and a suspended television camera, allows all rotations of the endoscope to occur while automatically avoiding image rotation on the television screen. The coupler includes first and second right angle deflectors, first and second rotatable bearings, and a compensation mechanism. Light is incident along a first optical axis (endoscope axis) and ultimately emerges along a second optical axis (camera axis). The first rotatable bearing is disposed between the first and second deflectors to permit relative rotation of the first and second deflectors about the coupler optical axis (horizontal). The second rotatable bearing is disposed between the second deflector and the camera to permit relative rotation of the second deflector and the camera about the camera optical axis.