ARRI WCU-4 wireless follow focus remote handset compatibility and features

Gear

ZephyrCan I fly my Alexa or RED on a Zephyr?389

Master SeriesIs a used Master Series rig worth buying as a first big rig?191

BFDHow do I power my BFD receiver from my camera or sled?186

VoltCan I retrofit a Volt onto my existing sled or gimbal?168

ArtemisHow do I power my camera and accessories from an Artemis sled?166

MDRWhere can I mount my Preston MDR on my rig?143

ModulusIs there a Modulus option for HD wireless video?141

G-70Will my G-70 fit my vest, gimbal or sled?126

FI+ZCan I control iris and zoom wirelessly, not just focus?60

HU3Where can I get my HU3 repaired, refurbished or repainted?60

CineLiveHow do I pack and case my CineLive rig for transport?54

G-70XHow does the G-70X compare to Pro Titan, Xarm and other arms?46

Trinity 2Is Trinity 2 SUP 3.0 firmware safe to install or buggy?46

Ultra VestWhich vest should I choose for my body size, comfort and operator type?39

2012Follow Focus forum

14 years old. Gear and prices may have changed since.

DisputedParticipants disagreed and reached no conclusion. Read the findings as positions, not as an answer.

The WCU-4 handset at 5950 Euro is sold separately from the receiver unit.
The WCU-4 is designed primarily as a focus and zoom remote with camera control functions for ALEXA Plus and ALEXA Studio cameras that have integrated radio receiving capability.
White-coded radio receivers including the UMC-3A and upcoming UMC-4 are compatible with the WCU-4 handset.
The WCU-4 lens mapping system allows marking every individual focus position on a lens, similar to Preston systems.
With ARRI Lens Data Server lenses, the mapping process requires only a single lens sweep with automatic configuration.
Non-LDS lenses can be mapped manually by setting each focus mark individually.
Motors with the WCU-4 support backdrive functionality, allowing manual focus adjustment at the lens even when a motor is attached.
The WCU-4 enables remote adjustment of ALEXA Plus and Studio camera settings including sensitivity, color balance, and frame rate.
Separate white-coded zoom and iris controllers are available and can be assigned to different operators.

At the time of the 2012 discussion, contradictory information existed about standalone receiver availability, with some sources initially stating none were planned while others confirmed compatibility with existing white-radio receivers.
On-screen display and pre-marked focus scales function only with LDS lenses without additional setup; non-LDS lenses require manual mark configuration.
The WCU-4 is specifically integrated with ALEXA Plus and ALEXA Studio cameras; compatibility with other camera models was not confirmed in this discussion.