Cartoni HD, fluid head with good fiction/fluid control .. it can handling tele focus lenses like 300/400/500/600/800 well just as show video below    Specification Payload capacity 150 mm (6′) 100 mm (4′)   10  kg (22 lbs) 12 kg (26lbs) Weight 2 kg (4,4lbs) Pan range (°) 360° Tilt range (°) +/-90° Counterbalance Continuous … Continue reading My Gear – Cartoni HD Focus (Fluid head for Bird Photography)