Genuine Canon tripod mounting ring.
For use with the Canon EF 70-300mm f4-5.6 L IS USM telephoto zoom lens.
Allows the Canon 70-300mm L IS USM lens to be fitted directly to a
Standard 1/4 inch tripod screw thread.
Improves lens balance.
Easily rotate the lens between landscape and portrait formats without
removing the camera from the tripod.