The type of head provided in the tripod is, in fact, the type of mechanism responsible for rotating the platform with the camera relative to the base.
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2D. Such heads have 2 degrees of freedom and allow you to turn the camera from side to side and tilt back and forth. At the same time, a separate rotation mechanism is provided for each of the two axes. This makes it easy to shoot vertical and horizontal panoramas: the camera on such a tripod can turn strictly along one of the axes without unnecessary movements that spoil the picture (for example, strictly to the side without moving up and down). Such heads are considered suitable primarily for video filming; for photography, they are somewhat less convenient, but they are still found in photo tripods (including highly specialized ones).
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3D. Heads with three degrees of freedom: turn from side to side, tilt up and down and “roll” right and left; a separate hinge is responsible for each of the three. They are mainly used in models with the ability to install cameras: such freedom of movement is important primarily for photography. However, specialized tripods for video cameras with 3D heads are also produced. Compared to ball heads (see below), which also provide a high degree of freedom, 3D mechanisms are more accurate, they are indispensable in cases where you need to clearly control the rotation along one axis (when shooting panoramic
...or shooting with a rotation effect). On the other hand, 3D heads are more complex and expensive, and also less suitable for quickly pointing the camera in an arbitrary direction.
— Ball. In heads of this type, the platform is attached to the ball by means of a rod, which is clamped in a special mount. By loosening the mount, you can rotate the camera horizontally, as well as arbitrarily tilt back and forth and left and right. The key advantage of such mechanisms is the ability to quickly change the position of the camera; in 3D heads (see above) it takes longer. Also, the advantages of ball heads include simplicity, compactness and low cost. On the other hand, it is difficult to turn the camera on such a head strictly along one axis without moving along the other two, which makes some shooting techniques difficult. In advanced tripods, additional equipment may be provided that partly eliminates this drawback — for example, a separate hinge for horizontal panoramas; however, in terms of accuracy, ball heads are still inferior to 3D mechanisms.
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