Canon EF lenses have equalled or even exceeded the optical performance of FD series lenses to achieve a new level of precision in autofocus and fully electronic control and create the core of the Canon EOS 35mm SLR camera system with next-generation design specifications. The lenses were designed with an eye on the future, not just focusing on image performance, but also keeping the entire system in mind - specifically, the electronic mount which allows total computerization of data communication between the camera and lens, high-precision electromagnetically driven diaphragm together with an ideal autofocus actuator inside the lens.