Porta-Jib 4-Leg Rideable Spider Dolly with Track Wheels

One of the best features of their 4-Leg Spider is the combination of their Pivoting Seat mounted on the Swivel Seat Mechanism. The Swivel Seat Mechanism pivots 360 degrees around the column, while the Pivoting Seat allows the camera operator to move in and out relative to the column. Putting these two motions together lets the camera operator keep his eye tucked into the camera's eyepiece and rotate his body around the column in sync with the panning motion of the fluid head. The camera operator can concentrate on his framing and incorporate a zoom or focus pull with his left hand as his right hand controls the pan and tilt.

The seat assembly adjusts its height by moving the threaded nut on the shaft. Also, the upper non-threaded section of the seat shaft can be removed from the bottom threaded section to drop the padded seat down lower for low-shot work. You can see this difference in the pop-up animation that describes the various heights of the column and low shot kit.