RED epic Operation Manual page 114

R E D D S M C O P E R AT I O N G U I D E : E P I C / S C A R L E T
4. There are two (2) ways to start the lens calibration process:
‒ When you attach a lens that the camera does not recognize, the "Unsupported Lens Found" dialog box
displays and asks if you want to calibrate the lens. Select Create Custom Lens Config.
Go to Menu > Settings > Maintenance > Calibrate > Lens and select Create....
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