What the thread found

• The ARRI UMC can be operated using a 12V power input despite initial uncertainty from rental sources, as confirmed by the device manual.
• A custom cable connecting 12V power via Hirose 4 connector to XLR 3 output successfully powered the ARRI UMC wireless focus system.
• ARRI wireless focus systems have limited compatibility outside ARRI and Moviecam camera platforms.
• Gears for ARRI wireless focus are available primarily in 0.8 pitch, with custom gearing required for other lens types.
• Modifications to ARRI wireless focus equipment for use with other camera manufacturers may void the manufacturer warranty.

Depends on

• The 12V operation method was tested on a specific setup but represents a workaround rather than officially supported operation.
• Experience with ARRI UMC compatibility is limited to ARRI and Moviecam systems; compatibility with Panavision, Aaton, and other systems requires custom modifications with uncertain reliability.
• Gear availability and custom modification costs make the system less universal than desirable for multi-platform use.

Parts

Follow Focus

Same gear or parts

1. 2026Pulling focus and zoom yourself while operating, especially on live showsOperator practice
2. 2026Swapping an ARRI ALEXA 35 between tripod/studio and Steadicam® mounting: baseplate choice and fastest workflow.FacebookSteadicam operators group
3. 2025LC-1 (Lens Control-1) follow focus system: wired architecture, motors, and early operational experience (1990s).FacebookThe Steadicam Group
4. 2024Modifications to a Steadicam Scout rig for expanded power distribution and connectivityGeneral Discussion