Manufacturer: Canon 

Model: EOS R(RF24-105mm F/4L IS USM)

RF Mount Compatible with RF Lenses and EF/EF-S Lenses*.
54mm Large Diameter and Short Back Focus
20mm Flange Focal Distance with Robustness for Professional Use
12 Pins for Quickly Communicating Large Amounts of Information
Variety of Mount Adapter Options for Expanded Compatibility with EF/EF-S Lenses