A tripod head is supplied with the tripod in a tripod kit and you can start immediately. Not all tripods and tripod heads have the same carrying weight. With a tripod kit you can be sure that the tripod and tripod head can carry the same weight. The choice for which tripod head you need is determined by the usage situation. Three-way heads and ballheads are suitable for shooting while you need a tripod with liquid head when filming.
