The Sigma TS-151 Tripod Socket is a specialised accessory designed for the Sigma AF 500mm F5.6 DG DN OS I Sports lens. The socket, made from Arca-Swiss-compatible magnesium alloy, is lightweight yet robust, & can be conveniently detached for h&-held shooting. This feature-rich tripod socket enhances lens stability, reduces vibration, & offers a quick transition between tripod & h&-held shooting, making it a valuable tool for photographers of all levels.