The velbon v4 articulating boom arm is a useful mechanism that combines a gearedslide elevator with a 180 degree tilt arm and a 360 degree horizontal pan uses include macro work and any application where fine adjustment of the camera position is an advantage using the boom arm is quick and easy a single twist of the grip at the end of the multi angle arm loosens both the tilt and rotation and when the arm is in the desired position a twist of the grip in the opposite direction re engages t