Large-diameter Fully Electronic Lens Mount
Every enthusiast for photography wants their camera to work like a physical extension of themselves. The EF lens implemented an inventive "fully electronic mount" to fulfil this desire. This mount eliminates the need for mechanical connections by making all operations between the lens and the body entirely electronic. All data transfer between the EF lens and the EOS camera body is done electronically when the mount is in use. Even with an extender in place, the autofocus communication links between the lens and the body remain intact, guaranteeing optimal functionality and robustness under the harshest circumstances. Canon's EF50mm f/1.0L USM, the brightest 35mm SLR lens in the world, was designed and made possible by its large, 54mm diameter electronic lens mount. This large-aperture lens increases the possible range of photographic expression by producing fine detail and an appealing background blur (bokeh) even in candlelight. Additionally, the large-diameter electronic lens mount design makes it easier to create new lenses for the EOS R system, including zoom lenses with greater magnification power and large-aperture single-focal lenses.
