The Jobu Design BWG-HD2 Black Widow Gimbal (Heavy Duty mk II Version) is a gimbal-type tripod head that allows the entire weight of the camera and lens combination to be hung rather than balanced.
Major improvements have been made to the original BWG-HD that include a significant reduction in overall weight. The new version is a half-pound lighter than its predecessor. This weight loss comes with a stiffening of the chassis, resulting in a much stronger gimbal less prone to flex. Additionally, a ball-bearing pivoting system has been introduced that makes the action on this gimbal much smoother than before.
The BWG-HD2 incorporates an elevated tilt mechanism and adjustable platform to make the camera/lens' center of gravity and tilt axis of the head be perfectly aligned.
This Gimbal design with a horizontal swinging arm is especially useful for large telephoto lenses, like a 400mm f/2.8, 500mm f/4, or 600mm f/4 lens. By re-orienting the mounting clamp to a horizontal position (rather than vertical sidemount), it allows for a much easier way of installing the lens, and one removes all the shear stress from the lens-collar on telephoto lenses.