The 128RC from Manfrotto is a lightweight fluid head.  It is ideal for scopes & cameras up to 8.818 lbs in weight.  It boasts a professional fluid drag system on PAN and TILT movements, and its flat base works with multiple tripod connections.  With a quick release plate, setup and connection are quick and easy.  Made of aluminum, and weighs in at just 2.2 lbs.