Fotodiox employs professional photographers in Allen areas of development and design to create products that are built to last. The Pro adapter series is designed to withstand the rigors and demands of professional photographers. Fotodiox's Pro adapters are made entirely of metal and no plastic to create a secure connection between your glass and your camera that will not deteriorate over time and keeps the lens-camera connection secure with every use. Our 24-month Fotodiox manufacturer's warranty applies to all Fotodiox products. The Fotodiox Pro series adapters are manufactured in the Fotodiox factory with the aim of the highest quality. We use chrome-plated brass mounts for improved durability and reliability, as well as an internal spring system that mimics the native camera body to ho.