Buy from Amazon.com : http://fave.co/1HdDV8p <br /><br />Nodal Ninja R1 Adjustable Tilt Ring Clamp Style Panoramic Tripod Head - fits Sigma 8mm f/3.5<br /><br />Product Description : <br />Panoramic Photography Lens Ring for Sigma 8mm f35 f4 and Sigma 15mm Canon mount
