The main differences between rf and ef lenses are as follows: first, the flange distance between RF and EF is different, RF can rotate some micro-single lenses, but EF can't; Secondly, RF telex is better than EF, and there is no obvious click sound when each RF lens focuses, while EF does. Thirdly, RF has a late-comer advantage compared with EF's old-fashioned structural modification because of its smaller size. It is also lens glass, and the dispersion caused by different spherical structures is completely different. Finally, RF is suitable for RF bayonet, EF is suitable for EF bayonet, and EF lens is a SLR system with 44mm long flange distance and 8 electronic contacts. RF lens is specially designed for micro-single system, with short flange distance of 20mm and 12 electronic contact, which can transmit more information. Demonstration model: Canon EOSR6 system version: v 1.5.0 1, with different concepts: ef lens is an all-round development of the concept of focusing electronization. Radio frequency lens is the core of system development. 2. Different features: the camera in ef lens and the microchip in lens communicate with each other through electrical signals to drive the motor in lens to focus. Rf lens has a large aperture with an inner diameter of 54mm and a short back focal length, which greatly improves the flexibility of optical design and enables it to develop an ideal lens. 3. Different emphases: ef lens adopts the mode of "camera ranging, lens built-in motor drive" between camera and lens, and there is no mechanical communication system. Rf lens aims to further expand the field of photography, provide users with more ideal lenses, and adopt new specifications of bayonet, thus improving the freedom of optical design and the possibility of system development.