Designed for professional use, the Bogen/Manfrotto 3021Pro can easily hold anything from 35mm to small view camera systems. What sets it apart from the 3021N is the capacity of the center column. Converting easily to a lateral arm, this allows the photographer to mount the column ninety degrees relative to the legs, making for completely unobstructed straight-down shooting. This is a big advantage for macro shooters.
The 322RC2 is unique in that it allows the camera mounting assembly to be positioned for left or right hand operation, in horizontal or vertical position, and in addition, will allow you to unblock, move, position and lock your camera with one hand in one position. This is due to the revolutionary design of its grip handle which incorporates the ball lock lever. 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. The tension of the ball can be adjusted to accommodate the load weight.
This head is not suitable for continuous tracking of moving subjects, it is not practical since one must always grip the lever to release the ball and thus your hand would tire after prolonged use.