This aluminum RED Digital Cinema DSMC Canon Mount attaches to your DSMC or DSMC2 camera brain providing an EF/EF-S compatible lens port for your camera. Dual locking rings secure your lens in the mount, minimizing play. The mount features captive screws, so you don't have to worry about accidentally dropping a screw into the sensor cavity. The mount supports electronic communication between the lens and the camera, although not all functions may be supported. RED DSMC mounts are designed to be swapped without requiring a backfocus adjustment.