1. Built-in CPL filter, the CPL filter can be removed, replaced or taken out without use, and the polarization can be adjusted according to the actual shooting. 2. The built-in filter uses an ultra-thin high-definition polarizer to eliminate reflections, increase texture, emphasize contrast, enhance three-dimensionality, restore colors, and increase saturation. 3. The adapter ring has a built-in metal mount, the edges are rounded, and it smoothly adapts to the camera. 4. Built-in software function, can record attribute and shooting data of digital photos, after installation, the body supports displaying aperture, shutter, exposure compensation and other information 5. Built-in electronic metal contacts and data circuits. When compatible with the camera body and lens, the camera body can control the lens aperture, greatly improving ease of use. 6. The inner wall of the R adapter ring has been flocked and extinguished, which is more effective than ordinary threaded matte. The front and rear mounts are made of metal, and the surface is electroplated, which is durable and does not damage the camera mount. 7. Compatible Lenses: For Canon EF/EF-S series; Compatible Cameras: For Canon R cameras, such as for R5/R6/R/RP etc.