Canon EF EOS R mount adapter is designed to allow Canon EF and EF S lenses to be used seamlessly on Canon R series mirrorless cameras. It maintains full autofocus image stabilization and electronic communication between the lens and camera ensuring native performance with no loss in image quality. The adapter features a solid and precise fit with durable construction for reliable everyday use. Mount Adapter Allows EF/EF-S Lens Compatibility with the EOS R Camera. Exterior Design Matched to EF Lenses. Dust- and Water-resistant. Metal Mount on Both Lens and Camera Sides Provide Rugged Flexibility.