The key feature of the 055XPRO3 is its 90 Degree center column mechanism, The horizontal column mechanism is housed within the tripod's top casting for compactness, but it is easily and quickly extended whenever you need it. Switching between vertical and horizontal column orientation requires no disassembly, and can even be done with a camera attached. The legs of the 055XPRO3 tripod are fast to extend and adjust with the Quick Power Lock levers. The special design of the QPL levers allows single-handed opening of all leg sections in one action. Intuitive and ergonomic leg angle selectors allow each leg to be independently and solidly set to any of the preset angles, again allowing considerable positioning freedom. A bubble level is built in to the top of the center column. The bubble level rotates freely around the center column, so it can be positioned wherever it's easiest for you to see. The top casting of the 055XPRO3 has an Easy Link connector for supporting accessories (such as an LED light, flash, reflector, or other piece of equipment) on an extending arm or bracket, and making the tripod into a practical mobile studio. The included ball head (498RC2) allows the camera to be positioned freely and quickly, then blocked solidly in place using the convenient single locking knob, ready to shoot in an instant.