Manfrotto Panoramic Rotation Platform Full Frame High rigidity & low mass High rigidity & low mass GS3513S replaces the GS3512S and features the latest components including the solid upper disc and hook 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