The Arca-Swiss Monoball PO Tripod Head Panning System and Slidefix Camera Plate is a unique knobless tripod head featuring a design that abandons traditional locking knobs and replaces them with a three-elements geared locking system. This system allows the head to be positioned at any angle. The Monoball PO locking elements apply a uniform force around the ball ensuring smooth camera movements in any axis. When the camera is placed directly on the ball and not on its neck, the movements are as stable as if they were on a rubber ring. The aspherical ball also prevents sudden camera movements. The panning system is located just below the camera mount, providing a panoramic rotation that remains in line with the vertical. The Monoball PO has a tilt ball range of 90°, and 360° panning. It weighs only 9.9 oz (280.66 g) and the 1/4" basic model ships with a 3/8" adapter to accommodate most cameras. The Monoball PO also includes an Arca-Swiss Slidefix Camera Plate which enables your camera to be mounted or dismounted from the tripod head in an instant.