21st Century BX3.5 3D Rig can easily hold heavy duty cameras with motorize interaxial and convergence controls. All camera alignment functions can also be motorized for remote operation. On the BX3 rig it is possible to mount the second camera from above (standard configuration) or from below (flip mode). One speciality of the rig is the pola-filter, which can be fixed in front of the mirror box. That way it becomes possible to remove disturbing reflexes which would look different on left and right eye image.