This ARRI Smart Iris Marking Ring Set is part of the Hi-5 ecosystem, it includes five iris rings that are auto-detectable iris rings that are plug-and-play when used with an optional Hi-5 hand unit. Each ring features a preprinted precision iris scale that you select from to match your lens, allowing you to accurately adjust the iris from the handwheel. Mounting the iris scale to your Hi-5 shifts the iris scale to the knob side of the lens data display. This provides the operator/DIT with control of the iris motor utilizing the full rotation range of the control knob.