Canon EOS cameras take autofocusing and electronic control to their limits. If you are new to single-lens reflex photography, automatic functions and easy handling allows you to shoot professional photographs with your first film. For experienced and professional photographers, the range of controllable features gives complete freedom of expression. The concept of the EOS system is to bring together state-of-the-art electron mechanical precision and optical excellence. This idea is achieved in the design of each lens. The ability to accept inter-changeable EF lenses is one of the main advantages of SLR cameras. Canon is the leader in the use of aspherical lens elements, fluorite crystal, ultra-low dispersion (UD) glass and other advanced optical technologies. EF lenses are a product of Canon's dedication to innovative lens design. Many successful professionals stake their reputation on the quality of images they produce with EF lenses.