How does Sony camera nx5 build a tripod?

There is a limit groove in the position of the foot to select the opening angle, and the three tripods choose the same limit groove.

Adjust the length and divide the tripod into several sections so that it can be stable when used. It is better to lengthen each one one by one. In other words, each tripod chooses to open the same section. Loosen the fixing screws and unfold the tripod. Then tighten the screw to fix it.