The Canon Mount Adapter EF-EOS R is a lightweight and compact lens adapter, handy to keep in your kit. This particular mount adapter will extend your range of compatible lenses, allowing you to attach any EF or EF-S mount lens to the EOS R mirrorless digital camera. With this adapter, you will be able to keep your full auto-focus range, as well as your image and stabilization capabilities. The mount adapter does not contain any optical components, which means that you will maintain the original optical quality of the mounted lens you are using. Additionally, the Canon Mount Adapter EF-EOS R is dust and water resistant, allowing you to use it in harsh weather conditions.