Hi Neil. thank you for the response.. what bothers me is series 2, 3 and the 4 has the same load capacity and why should someone get the tripod from series 4 instead of 3 for instance? I know the leg diameters are very important for reducing and dampening the vibrations and also for general rigidity of the tripod. I know I answer my questions myself but I would be happier if the gitzo designers were used different top plates for every series. ..I wish I could talk to gitzo designers and learn about this..