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Flexible connectivity and control

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A modern take on the classic zoom control

Rugged, weather-resistant, and ergonomically designed, the ZMU‑4 seamlessly transitions between wired and wireless configurations. Its unprecedented connectivity enables versatile, clutter-free camera builds and faster on-set workflows.

Introducing the ZMU-4

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Uniquely versatile wireless functionality

Choose different radio modules for different regions and shooting situations – the ZMU‑4 supports all the new radio module options available for the Hi‑5 hand unit. Wireless operation is more streamlined than with any other system.

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Wireless expansion for other devices

The ZMU‑4 can act as a radio module for other LBUS control devices such as the ARRI OCU‑1 or Master Grips, offering the possibility of multi-axis controllers off-camera.

Ergonomics and durability

Intuitively familiar for traditional tripod setups, the ZMU‑4 is comfortable to use in either hand, allowing precise control via the force-sensitive zoom knob. It is also the most robust and weather-resistant zoom unit on the market. 

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Innovative display

An easy-to-read display shows the exact focal length at any point in the zoom range, as well as the zoom speed and remaining battery power. Markers and limits for individual shots can be set with ease.

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Configurable control, on or off the camera

Three user buttons offer customizable shortcuts for the operator and dedicated zoom speed buttons fall neatly under the index finger. Camera control is available for ARRI and third-party camera systems.

With the Hi‑5 hand unit, ARRI introduced the fifth generation of its Electronic Control System (ECS). Now, the ZMU‑4 joins that ecosystem, sharing the Hi‑5’s swappable RF-EMIP, RF-2400, and RF-900 radio modules (coming soon), with different frequencies for different territories and shooting situations. Whichever radio module is chosen, it fits neatly into a recessed slot in the ZMU‑4 and becomes integral to the slimline form factor. There are no external radio boxes and no additional cables or setting up—just unplug from the camera and go.


Like the Hi‑5, the ZMU‑4 is compatible with industry-standard Sony NP-F550/570 batteries, though it has been designed and optimized to make use of proprietary ARRI LBP-3500 batteries, which offer more consistent power delivery and an unprecedented run time of at least 15 hours with the RF-EMIP radio module. The ARRI batteries also allow the ZMU‑4 to display remaining power as a highly accurate percentage, permitting more efficient battery management than is possible with any other zoom control.


When used as a radio receiver, the ZMU‑4 performs the same role as the Radio Interface Adapter RIA‑1, removing the need for an extra box on the camera body. It can enhance the flexibility of existing ECS motor controllers with support for the ultra-long-range RF-900 (coming soon) and RF-2400 radio modules, or it can replace motor controllers entirely. As a motor controller, the ZMU‑4 allows any camera and lens to benefit from the features of the ARRI Hi‑5 or WCU‑4 hand units, again making for a cleaner camera build.


Two new adapters, the RA-7 and RA-8, enable the ZMU‑4 to be used with a huge range of existing accessories equipped with multi-position ARRI rosette attachment points, which have been an industry standard for decades. The RA-7 allows the ZMU‑4 to be attached to the rosette mount on any camera, hand grip, or bridge plate, and the two Handgrip Pan Bar Adapters and Pan Bar Clamp Universal are ideal companions for tripod mounting. The RA-8 permits the ZMU‑4 and Operator Control Unit OCU‑1 to be combined into a compact and versatile single unit that can monitor-mounted or handheld.

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Radio modules
Radio interface
Rosette Adapters

"You will probably begin by attaching the ZMU‑4 to a tripod handle and connect to the camera by cable. After marveling at the smooth moves and feathered end stops, you will hesitantly insert a radio module, disconnect the cable, and see how it runs wirelessly. You may never go back. You’re a smooth operator, blissfully unencumbered by cables."

Jon Fauer

Jon Fauer

Film and Digital Times

"The most impressive thing about the ZMU‑4 was the remote capability. It provides a familiar form factor that gave the DP access to the zoom in a variety of situations, including a remote head controlled from a follow vehicle and conventional crane setups. It incorporates existing radio modules as well as LBUS integration, which allowed for a quick and easy workflow."


Dan Abbot

1st AC (pictured with DP Paul Shakeshaft)

The ZMU‑4 ticks all the boxes I’ve been looking for in a zoom controller. With the option of four zoom curves, I can tune the ZMU‑4 to exactly the way my operator wants it. Being able to run the unit wirelessly makes re-rigging and using it on set a much more seamless workflow, with no cables getting in the way. The fact that it integrates into the existing toolset, sharing lens data across the whole system, is incredibly useful.

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Jim McLean

1st AC

"The ZMU‑4 provides fuctionality in ways one only dreamed of before. Wireless zoom control with no cables and multiple ways of mounting and using it? Yes please!"

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Brian Aichlmayr

1st AC

"Being an LBUS-updated zoom control that is compatible with ARRI’s new radio modules, the ZMU‑4 does exactly what it should. On top of that, it gives new life to the OCU‑1, quickly becoming a solid 2-channel DP control for zoom and iris. On rainy days this combination was mounted to the camera outside of the cover, so my operator Felix Tonnat had easy control of all functions."


Florian Bellack

1st AC

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User-friendly interface
  • Smooth, force-sensitive joystick control
  • High-contrast lens data and status display
  • Dedicated run/stop button and tally light
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LBUS and CAM port
  • LBUS port: for lens control and additional LBUS devices
  • CAM port: for run/stop and camera control

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Radio module slot
  • Interface for swappable radio modules
  • Fully integrated form factor
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Control at your fingertips
  • Three user buttons for custom functions
  • Dedicated zoom speed buttons

ARRI Tech Talk: Introducing the ZMU-4 Zoom Control


  • The ZMU‑4 is compatible with all cameras in its most basic configuration, with just one cforce lens motor and a power source. Further camera control is also available, depending on which camera you are using. See the configuration guides for more details here.



    ARRI cameras  

    - ALEXA 35 

    - ALEXA Mini  

    - ALEXA Mini LF  

    - ALEXA Plus cameras (Plus, XT, SXT, LF, 65) 

    - AMIRA  

    3rd party cameras  

    - RED cameras (e.g. RED Komodo, Raptor, Monstro, …) 

    - SONY cameras (e.g. Sony Venice, Venice 2) 

    - Canon cameras (e.g. Canon C300, C500, C700) 

  • The ZMU‑4 is hardwired compatible with 3rd party cameras by its CAM (7p) connector. Depending on the different setup following functions are supported: 

    • REC start/stop and tally 
    • User Buttons support 
    • F/I/Z control 



    Supported Functions 


    (e.g. Venice & Venice 2) 

    Cable CAM (7p) - Sony Remote (8p)/D-Tap (0.8m/2.6ft) 


    - REC start/stop, tally 

    - F/I/Z control 


    (e.g. Komodo, Raptor) 

    Cable CAM (7p) – RED CTRL/D-Tap (0.6m/2ft) 


    - REC start/stop, tally 

    - F/I/Z control 

    - User Buttons (DSMC2, Raptor only) 


    (e.g. C300, C500) 

    Cable CAM (7p) – LANC/D-Tap (0.6m/2ft) 


    - REC start/stop, tally 

    - F/I/Z control 

    The ZMU‑4 is wirelessly compatible with 3rd party cameras by using the RIA‑1 or the cforce mini RF motor connected to the camera by its CAM (7p) interface. Please use the same cables as mentioned in the chart above *. 

  • Yes, you can connect the ZMU‑4 wirelessly with the cforce mini RF when equipped with the white-coded RF-EMIP Radio Module. 

  • The ZMU‑4 is wirelessly compatible with the following motor controllers when equipped with the white-coded RF-EMIP Radio Module. 

    - UMC-4 

    - AMC-1 

    - SMC-1 

    - EMC-1 

  • The ZMU‑4 is directly compatible via the LBUS interface with the following motors: 

    - cforce mini lens motor 

    - cforce mini RF lens motor 

    - cforce plus lens motor 

  • Yes, you can set limits as well a marker with one of the assignable ZMU‑4 user buttons. 


    Limits allow you to define the range of motion of the lens motor. The joystick will function as normal, but the lens will not move beyond the near and far limit that you set with the Limit User Button Function.  


    You can set one marker on the bar graph. The display will give visible feedback when getting close to and hitting your mark, similar to a traffic light system. To reset the marker, please hold down the Marker User Button. 

  • Yes, you can assign the ZMU‑4 to control other lens axis like Focus, Iris or AUX in the CONTROL menu. 

  • Yes, its possible to assign camera user buttons to the ZMU‑4 and control up to 3 camera user buttons. Following cameras are supported: ALEXA35, ALEXA Mini LF, ALEXA Mini, AMIRA, RED DSMC2, RED Raptor. The corresponding function of a user button must be set on the camera. Please check the designated camera user manual how to set the user buttons. 

  • It’s not possible to load a lens table in the ZMU‑4 via the USB-C interface. You can transfer one lens file with the Hi‑5 or WCU‑4 hand unit to the ZMU‑4. The ZMU‑4 will display the lens data (e.g. focal length).  

  • Yes, you can connect the ZMU‑4 via the LBUS interface hardwired to the Hi‑5 hand unit. 
    Important: In this configuration, the ZMU‑4 will act as the radio transmitter and the Hi‑5 radio will be disabled.

  • The longest available cable length when connecting the ZMU‑4 hardwired via LBUS is 15m/49ft with the K2.0006756 Cable LBUS - LBUS (15m/49ft). 

Sample setups

ZMU‑4 + OCU‑1 as 2-axis controller and Hi‑5 wirelessly connected to an ALEXA 35 for lens and camera control

ZMU‑4 hard wired to an ALEXA 35 for lens and camera control

ZMU‑4 and Hi‑5 sharing a single ARRI ECS radio module for ALEXA 35 lens and camera control

ZMU‑4 hard wired to an ALEXA Mini / Mini LF for lens and camera control

ZMU‑4 + OCU‑1 as 2-axis controller and Hi‑5 wirelessly connected to a RIA‑1 for ALEXA Mini / Mini LF lens and camera control

ZMU‑4 as radio receiver (host) for AMIRA camera and lens control

ZMU‑4 + OCU‑1 as 2-axis controller and Hi‑5 wirelessly connected to cforce mini RF for 3rd Party lens and camera control

ZMU‑4 as radio receiver (host) for 3rd Party camera and lens control

Technical data


Force sensitive joystick


Transflective TFT-LCD Display (readable in bright sunlight) 0.96“ diagonal


- 1x LBUS (LEMO 4pin) for lens motors, daisy chainable; supports LBUS protocol, LCS protocol (for ALEXA cameras) and EXT protocol (for AMIRA cameras)

- 1x CAM (LEMO 7-pin) for camera control

- 1x USB-C for software updates

- 1x ARRI Radio Module Interface

- 1x Battery Interface

Mounting points:

2x interfaces for ARRI Rossette

Operating temperature:

-20° to +50°C

-4° to +122°F


- 360 g / 0.79 lbs (ZMU‑4 body)

- 476 g / 1.05 lbs (ZMU‑4 body with battery)

- 526 g / 1.16 lbs (ZMU‑4 body with battery and RF-EMIP or RF-2400)

- 556 G / 1.23 LBS (ZMU‑4 body with battery and RF-900)

Power Supply: 

Powered externally:

- Power via LBUS interface

- Power via CAM interface

Powered by battery:

- ARRI LBP-3500 battery pack

- NP-F550 battery (Sony) or compatible batteries

External Power Supply

10.5 - 34 V DC

Power Consumption Typ (W)

- 1 W (ZMU‑4 body)

- 1.4 W (ZMU‑4 body with RF-EMIP)

- 2.3 W (ZMU‑4 body with RF-2400)

- 3 W (ZMU‑4 body with RF-900)

Measurement (L x W x H)

- 66 x 43 x 215 mm / 2.6 x 1.69 x 8.46" (ZMU‑4 body)

- 66 x 45 x 277 mm / 2.6 x 1.77 x 10.91" (ZMU‑4 body with RF-EMIP or RF-2400)

- 66 x 45 x 414 mm / 2.6 x 1.77 x 16.3" (ZMU‑4 body with RF-900)

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