This ARRI Smart Focus Left-Hander Marking Ring is an auto-detectable focus scale ring that is plug-and-play when used with the optional Hi-5 hand unit. It features a preprinted precision focus scale with markings from 0.75m to infinity, allowing you to accurately adjust the focus from the handwheel. Mounting the focus scale onto your Hi-5 updates the lens data display to accommodate the orientation of the marking ring. This provides the focus puller with an option to match their focus-pulling style.