The PC-LR-40 Panning clamp is designed to offer precision horizontal panning as a versatile modular item. Combining our patented lever-release clamp jaw with a lockable 360-degree panning bearing, the PC-LR is a robust yet lightweight panning solution for more convenient single-row panorama shooting. Like all of our lever-release clamps, the PC-LR-40 offers the fastest action for quick-release of plates and rails in and out of the jaw. With a patented stainless-steel lever that flips to three positions: closed, half-open, fully-open - you can be confident in the state of the clamp lock at a glance.The panning clamp has precision laser engravings for panning angle and camera position, and an integrated 8mm bubble level makes leveling quick and easy.The PC-LR-40 features a built-in, patent-pending R-Mount, allowing you to rigidly mount it onto any Really Right Stuff ball head stem. This allows using the ball head to level the panning axis, thus eliminating the need for a leveling base in many applications. The increased speed and accuracy offered by the panning clamp makes setup for single-row panoramas a snap.The PC-LR-40 can be paired with a modular dovetail accessory (TH-DVTL-40) which adds an RRS 1.5" dovetail to the bottom of the panning clamp. This quick-release modularity allows part-time panorama shooters to eliminate the weight off their tripod setup when it's not needed.The clamp features a central 3/8"-16 threaded socket, and also incl