RED DIGITAL CINEMA DSMC2 BRAIN with HELIUM 8K S35 Sensor (2018 Unified DSMC2 Lineup) - Manual (Page 253)

CANON EF LENSES
This section describes the appropriate method for attaching and detaching Canon ® EF lenses. For more information,
refer to the original manufacturer’s instructions.
This section also lists lenses supported by the DSMC ® Canon EF Mount.
WARNING: ALWAYS protect your equipment, when it is not in use, by replacing lens caps and mount caps.
ATTACH CANON EF LENSES
1. Rotate the secondary locking ring counter-clockwise to disengage.
2. Press the lens release button and rotate the lens cap counter-clockwise to remove the camera mount cap.
3. Remove the rear lens cap.
4. Align the red dot on the lens with the red dot on the DSMC Canon Mount and position the lens in the mount.
5. Turn the lens clockwise until it clicks into place.
6. Rotate the secondary locking ring clockwise to engage.
DETACH CANON EF LENSES
1. Rotate the secondary locking ring counter-clockwise to disengage.
2. Press and hold the lens release button. While holding the lens release button, turn the lens counterclockwise until it
stops and remove it from the camera mount.
3. Replace the rear lens cap and camera mount cap when the lens is not in use.
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DSMC2 HELIUM OPERATION GUIDE