The gitzo gh5750qr series 5 off centre ball head has been completely revised for improved performance and weight reduction the ball sphere is now ptfe treated for a greater smoothness and precision the control knobs have a different design that improves ergonomics allows for a better operation and contributes to the weight reduction the internal panoramic lock is now 3 times stronger than before which is a terrific advantage when these heads are used with lateral arms or with centre column