Really Right Stuff’s RRS-9000438 Compact Panning Clamp is built to deliver precision horizontal panning in a versatile, highly modular package. Equipped with the patented lever-release clamp jaw and lockable 360° panning bearing, the RRS-9000438 offers a durable but lightweight panning solution for convenient single-row panorama shooting. Like all of Really Right Stuff’s premium lever release clamps, the RRS-9000438 features one of the fastest release of plates and rails in and out of the jaw, and the patented stainless steel lever flips to three positions: fully-open, half-open, and closed – allowing the user to immediately tell the position with a simple glance. The RRS-9000438 also includes the patent pending R-mount which is compatible with all of Really Right Stuff’s ball head systems. This accommodates the use of the ball head to level the panning axis, and eliminates the need for a leveling base in many applications and increases the speed and accuracy provided by the panning clamp. Other features of the RRS-9000438 include laser engravings for panning angle/position, as well as an integrated 8mm bubble level for fast and easy leveling. In addition, the RRS-9000438 features a central 3/8”-16 threaded socket, as well as a flat-head 1/4"-20 and M6 screws for mounting directly to Really Right Stuff and Arca-Swiss ball heads. Features of the RRS-9000438 Compact Panning Clamp: The finest RRS quality materials machined from solid aircraft aluminum for lowest profile and minimum weightAnodized; Type II BlackLaser engraved center marksLaser engraved rotary markings at 5 degrees incrementsIntegrated 8mm "bulls-eye" spirit levelR-Mount (Patent-pending) for rigid mountingLockable panningRobust 3 position plate lever release, self-adjusts to accept all Arca-Swiss/RRS-style plates except Arca-Swiss P0 Slidefix and Novoflex plateCentral mounting socket is threaded 3/8"-16Can replace the clamp on the top of a ball head, eliminating the need for a leveling base for many applicationsCompatible with RRS Compact Knob Extender and TH-DVTL-40 Really Right Stuff PC-LR-40 Compact Panning Clamp RRS-9000438