The Canon Mount Adapter EF-EOS R lets you connect your existing EF or EF-S lens to your EOS R system camera while maintaining the same levels of performance and functionality as on your DSLR. Its perfect for photographers who already have a number of EF lenses. Canon EOS R adapters are built for tough environments and are weather-sealed against dust and moisture. Finally, as the adapter is lightweight approximately 110g it means that it doesn't add much weight to your lens.Access to the EOS R SystemAllows you to use your EF and EF-S lenses on a Canon EOS R camera body, perfect for any photographer with a number of EF lenses in their kit bag who is looking to effortlessly upgrade to the Canon mirrorless R systemRetain performance and functionalityDesigned by Canon engineers to maintain the same levels of performance and functionality as seen on your DSLRWeather sealed for extreme conditionsBuilt for tough environments, the mount adapter is weather sealed against dust and moistureUser-f