PATENTED LOCKING SYSTEM: The patented zero-drift locking system holds up to 30 kg. Long lenses and large-scale CSC/DSLR cameras are safe and secure without losing fluidity IDEAL FOR PROFESSIONAL LONG LENS KITS: Smooth motion and fluidity for heavy duty long lens kits (400-600mm with CSC and DSLR cameras). Tripod for outdoor use for wildlife photography and bird watching MAXIMUM SMOOTHNESS AND FRICTION CONTROL: Coated hollow-sphere ball head for maximum framing reactivity – combined with an advanced friction system for an incredible sensation of smoothness DEDICATED PAN AXIS: Independent fluid drag cartridge dedicated to the pan axis for maximum smoothness during subject tracking and video shooting SCREW VERSION: Screw or lever lock options available