Abstract: A special connection structure for a gimbal head, comprising an adapter platform provided at an upper end with an adapter platform suitable for mounting and fixing a photographic apparatus and at the other end with a turn knob, an oblique column and a base. A screw for connecting a tripod pedestal is provided in a lower middle portion of the base. A positioning switch protrudes from a side face of the special connection structure. The positioning switch is opened to pitch the oblique column from 0° to 45°, 90° or 180°, and the oblique column is rotated by 180° to allow the oblique column to stand upside down between two legs of a tripod, without disassembling a gimbal head from the tripod, so that the application value of the gimbal head is improved.

Abstract: An automatic leg tube locking device including a hollow cylinder shaped guide switch and a circular truncated cone shaped guide post which are mutually matched for use. Through holes are evenly formed in the side surface of the guide switch, the through holes are adapted with locking shafts, a transmission mechanism is arranged between the guide switch and the guide post, so that the guide switch vertically moves along the inclined cylinder surface of the guide post and drives the locking shafts to move along the guide post when the guide switch and the guide post rotate relative to each other. A photography tripod, a unipod and a crutch are further provided. The automatic leg tube locking device, the photography tripod, the unipod and the crutch are capable of pulling the leg tube to any position and lock the leg tube automatically in a locking state.