The Gitzo GK3580QR Series 3 Carbon Fiber Tripod is a complete solution for discriminating users who want exacting placement, premium operational refinement, and minimal weight to carry. It is ideal for use with modern SLRs and lenses of up to a very large 300mm f/2.8, and usually provides sharp images even with 400mm f/2.8 or 600mm f/4 lenses. The fit and finish are delightful, and what you should expect from the industry's top brand; Gitzo means for your tripod to deliver decades of service, and offers a lifetime warranty against manufacturer defects.
The GT3531 leg set is Gitzo's eye-level-height Series 3 6x carbon fiber model, made from their superior, ultra-thin carbon fiber strands. Beyond the weight savings we're all after, carbon fiber has a tendency to 'eat' vibrations rather than transmitting them, much like a wooden tripod would.
The GH3780QR Center Ballhead is from their most modern collection, a PTFE-treated sphere with a large locking knob on the side and a very impressive ability to stay where you put it once locked. It has a quick release system specific to Gitzo, and it has a bubble level right at the base of the plate. You can also adjust the friction of the ball when unlocked, allowing you to track moving subjects with autofocus without needing to constantly worry about keeping your hands on the gear.
Altogether, this Gitzo kit weighs just 6.2 lbs.