This Fotodiox Pro Lens Adapter allows you to attach Canon FD lenses to your Canon RF-mount mirrorless camera body. This adapter has a fully manual design, which does not relay electronic communication between the camera and lens, and maintains infinity focus along with the ability to use aperture priority metering. This lens adapter incorporates a manual iris control ring to adjust exposure. The ring's durable all-metal design also features chrome-plated brass lens and camera mounts to ensure a precise, no-play fit. Additionally, a tripod mount is incorporated at the base of the adapter for improved stability when working with heavier adapted lenses.