The Photo Clam PQR46NS Quick-Release Clamp presents an excellent way to add an Arca-Swiss-style quick-release mechanism to your existing camera head. The clamp has a 3/8"-16 thread so you can attach it to any head with an interchangeable quick-release component and a compatible stud. (A reducer bushing – sold separately – could be used to fit the clamp to a head that has only a 1/4"-20 screw.)
The clamp's knob allows you to lock securely most dovetail quick-release plates and brackets, including those from Photo Clam and other manufacturers, for simple and fast camera change-outs. The Quick-Release Clamp features dual bubbles, for leveling your camera to the horizon in either a horizontal or vertical orientation.