RF Mount
Canon introduced the EOS R System and the RF mount in 2018, just over 30 years after the EF mount and EOS System. This imaging system marked the beginning of a new era for Canon, providing greater flexibility and growth opportunities. Since the goal of the EOS R System was to broaden the range of possibilities to meet the future needs of both photo and video users, Canon recognised the need for a lens mount with new specifications that would ensure maximum growth potential and optical design flexibility. Canon created the RF mount as the foundation for the EOS R System, with the primary goal of developing a new line of lenses to support an imaging system that has the potential to evolve and advance far into the future.
The RF mount has a large 54mm inner diameter barrel and a short back focus distance of 20mm, which significantly increases optical design flexibility and supports the development of new and unique lens designs. This mount has the potential to develop large-aperture standard zoom lenses with a maximum f-stop of f/2, such as the RF28-70mm f/2L USM lens; Another notable feature of the RF mount and EOS R System is the new 12-pin communication system. It significantly improves communication speed by instantly transmitting large amounts of data between the lens and the camera, such as focus, zoom, aperture, image stabilisation settings, lens aberration, and data for digital lens optimizers (DLO). With these features, the system can achieve excellent image resolution and a beautiful bokeh effect with a large fully open aperture. The new control ring designed for the lenses also provides smooth operation. The RF lens series expands on Canon's pioneering philosophy, which began with the EF-mount lens series.