Expand Your Camera Lens Functionality This lens adapter ring is a practical and versatile accessory that allows photographers to expand the capabilities of their camera lenses. Attach it to the front of the lens and it serves as a bridge between the lens and the magnetic filter system. The ring features a screw thread on the inside, which enables it to screw onto the lens effortlessly, and a smooth outer surface to accommodate the magnetic attachment mechanism of the filter system. This adapter ring enables the use of Okko's CPL, ND and Magnetic Lens Cap filter system.