The Canon EF-EOS R Control Ring Mount Adapter is a similar lens adapter to the Canon EF-EOS R Mount Adapter with the addition of a customizable control ring. The control ring is the same as that on native RF-mount lenses, thus, you can control numerous settings and functions such as adjusting ISO, aperture, and exposure compensation as you would on a RF lens. This ring also provides tactile feedback when being turned, making it easy to recognize and control your settings adjustments. It also retains full autofocus and image stabilization capabilities and contains no optical components, thereby maintaining the original optical quality of the mounted lens.
Finally, it is dust- and water-resistant.