New RF Mount With the new EOS R comes the new RF lens system with 3 different mount adapters. The new lenses boast the new Control Ring. This allows for changing aperture, ISO or exposure composition, to name a few. The newly designed RF mount is designed for full, uninhibited compatibility with all your existing EF, EF-S, TS-E and MP-E lenses through the use of mount adapters. The RF mount features a 54mm inner diameter, the same as Canon’s EF mount, but it has a shorter flange focal distance of 20mm that allows lenses to be simpler and optically superior. There is also the Drop-In Filter lens mount which allows you to add unique effects that improve your shots by dropping in filters such as variable neutral density, circular polarizing or clear.


