Manfrotto Panoramic Rotation Platform Sigma SA Mount The leveling base is an The leveling base is an accessory dedicated to Gitzo Systematic Tripods and allows quick accurate leveling when setting up a shot The diameter of the widest part of the rubber foot is 30mm The 300N also comes complete with a secondary locking screw which stops unwanted or accidental rotation of the head when heavy or off centre equipment makes it less balanced or when the head is used for non horizontal rotation The set positions of the 300N give ample choice of rotation angle and so of number of photos needed to complete a 360° pan and cover the most common requests of panoramic photographers depending on the camera lens equipment used