Lightweight and compact, the Mount Adapter EF-EOS R connects EF and EF-S lenses to the EOS R camera, exponentially expanding the list of compatible lenses. While the Canon EOS R mirrorless system already comes with four stellar lenses, having the ability to use all the other Canon lenses in your arsenal is the best way to take full advantage of the EOS R mirrorless camera. To help you expand the number of compatible lenses for Canon’s first full-frame mirrorless workhorse, the Mount Adapter EF-EOS R facilitates a seamless connection between any EF or EF-S lens and the new RF lens mount. This lightweight and highly compact adapter, which offers the same dust and weather sealing as the L-series lenses, allows for limitless creativity with your EOS R by giving you full access to the plethora of EF and EF-S lenses available on the market.