Manfrotto 222 Grip Action Ballhead
The Bogen/Manfrotto 222 Grip Action Ballhead is fast to set up and an easy to use tripod head. The very act of taking your hand away from the grip locks the head into position, which eliminates the extra step of having to tighten a knob or lever before being ready to shoot. You have immediate access to half of a sphere in which to position your camera. The tension of the ball can be adjusted to accommodate the load weight.
It is not for continuous tracking of moving subjects, because you must always grip the lever to release the ball and thus your hand would tire after prolonged use. In the vertical mode of horizontal-format cameras, it is limited to only 5.5 pounds. But for 6X6cm format shooters or 35mm up to an 80-200mm f/2.8 lens, it exceeds all others in expedience. An ideal head for wedding or portrait photographers.
For more details visit the manufacturer's site.