This ARRI Smart Focus Ring Left Hander Set is part of the Hi-5 ecosystem and features 10 auto-detectable focus scales that are plug-and-play when used with an optional Hi-5 hand unit. It includes 10 rings with preprinted precision focus scales with markings in meters, allowing you to accurately adjust the focus from the handwheel. Mounting the focus scale that matches your lens to your Hi-5 updates the lens data display to accommodate the orientation of the reverse marking ring. This provides the focus puller with an option to match their focus-pulling style.