Vortex Radian™ Ball HeadThe Vortex Radian Ball Head has independent pan and tension control. The ball head can tilt in any direction at angles up to 45 or down to 90 in either of the two notches. Independent knobs control the ball angle tension, a lock of the ball, and the lock tension of the panning motion. The mount system uses an ARCA SWISS head mount complete with a matching quick release plate. The head sits on a short center column with a counterweight hook on the