The Sunwayfoto DMP-200R Rail Nodal Slide is an Arca-type and Really Right Stuff lever clamp compatible quick-release rail that is used to accurately find the nodal point of your lens when used in panoramic photography. In close-up photography, the rail allows for easy front-to-back adjustment. It has a laser-engraved scale on both sides of the rail to help accurately adjust the rail and find the nodal point. A strap slot allows for fastening a camera strap for increased comfort and security, and safety stop screws prevent accidental release from the clamp. The rail's hard-anodized finish helps protect it from bumps and scratches.