Here is a cheap product and well finished. Do not, however, expect to receive the equivalent overpriced kneecaps major brands. It is clear, however, what is beautifully machined, what is heavy and what is pro. In practice, though she squeezes our Nikon 610 with its 70/300 to death in locked position; its radiation amplitude is more than correct. The scale ring is very useful for angles of architectural photos and landscapes. Having handled a few times Rolls tripod but reluctant to spend money unnecessarily, we find this ball great value / price ratio. However we advise you to pay attention to the currents that are 1/4 feet thread (13mm716) while the ball (pro) is 3/8 thread (17mm145). Then plan to buy an adapter. (ServaneL.)
