The diameter of tripod leg is connected with the lock material, including
14 mm, 16 mm, 18 mm and 22 mm and so on. Generally, 14mm is used for hand-held lightweight tripod, 16mm is used for outdoor tripod, more than 18mm is used for heavy tripod. Lock is divided into fixed lock and continuous lock, continuous lock can be used for a long time and won’t loose. This payload is higher than the payload weight of fluid head, in fact with no practical significance.
Payload of fluid head
The payload of fluid head also called
counterbalance, means camera can keep balance and not fall on the ground, but
this has to do with the gravity balance of camera, generally is about 10 cm from
the camera plate. Many payload weight is not counterbalance and have no
practical significance, because as soon as all the hand knob be locked, there is
no problem for 10 kg counterbalance bearing of 50kg equipment, this is a big
misunderstanding of domestic radio and television industry.
There is also a technical difficult to domestic manufacturers for just looking at the size of fluid head to define the payload and don’t know the payload means counterbalance. Domestic which is similar to Sachtler’s fluid head is with much less actual counterbalance than Sachtler, but they also sell well since many users are not so clear about this.