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

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.

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.

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.

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.

Interchangeable radio modules

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.

ARRI batteries for all-day power

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.

Streamlined camera builds

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.

Rosette interface adapters

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.

Radio modules

Battery

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

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.

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!"

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

User-friendly interface

Smooth, force-sensitive joystick control
High-contrast lens data and status display
Dedicated run/stop button and tally light

LBUS and CAM port

LBUS port: for lens control and additional LBUS devices
CAM port: for run/stop and camera control

Radio module slot

Interface for swappable radio modules
Fully integrated form factor

Control at your fingertips

Three user buttons for custom functions
Dedicated zoom speed buttons

ARRI Tech Talk: Introducing the ZMU-4 Zoom Control

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

Suggested Kits and Accessories

ZMU-4 Zoom Main Unit Basic Set

KK.0043770

ZMU-4 with white-coded RF-EMIP radio module and accessories. The RF-EMIP radio module is compatible with all ARRI cameras with integrated radio (white coded) and with all w...
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Li-Ion Battery Pack LBP-3500

K2.0036022

Smart battery pack with built-in battery management system for quick-charge with the LBP Battery Charger and precise status display (in %) on the Hi-5 hand unit. Capacity: ...
LBP Battery Charger

K2.0039874

Single charger for the Li-Ion Battery Back LBP-3500. Supports quick-charging (2-3 hours). This product may not be available in some countries.
Handgrip Pan Bar Adapter 18mm

K2.0012918

Pivotable clamp arm to attach Master Grips and the ZMU-4 with a Rosette Adapter RA-7 to fluid head pan handles with 18mm tube diameter.
Handgrip Pan Bar Adapter 20mm

K2.0012919

Pivotable clamp arm to attach Master Grips and the ZMU-4 with a Rosette Adapter RA-7 to fluid head pan handles with 20mm tube diameter.
Handgrip Pan Bar Clamp Universal

K2.0012920

Adjustable clamp arm that links Master Grips and the ZMU-4 with a Rosette Adapter RA-7 to fluid head pan handles up to 32mm tube diameter.

Additional Radio Modules

RF-2400 Radio Module 2400 MHz FHSS Set (2x)

KK.0039984

Set of two exchangeable radio modules for Hi-5 hand unit and Radio Interface Adapter RIA-1. Point-to-point communication for connecting one Hi-5 hand unit with one Radio In...
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RF-2400 Radio Module 2400 MHz FHSS

K2.0036598

Exchangeable radio module for Hi-5 hand unit and Radio Interface Adapter RIA-1. Point-to-point communication for connecting one Hi-5 hand unit with one Radio Interface Adap...
RF-900 Radio Module 900 MHz FHSS Set (2x)

KK.0039986

Set of two exchangeable radio modules for Hi-5 hand unit and Radio Interface Adapter RIA-1. Point-to-multipoint communication for connecting up to three hand units with one...
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RF-900 Radio Module 900 MHz FHSS

K2.0036599

Exchangeable radio module for Hi-5 hand unit and Radio Interface Adapter RIA-1. Point-to-multipoint communication for connecting up to three hand units with one camera devi...
RF-EMIP Radio Module 2400 MHz DSSS Set (2x)

KK.0039985

Set of two exchangeable radio modules for Hi-5 hand unit and Radio Interface Adapter RIA-1. Point-to-multipoint communication for connecting up to three hand units with one...
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RF-EMIP Radio Module 2400 MHz DSSS

K2.0033702

Exchangeable radio module for Hi-5 hand unit and Radio Interface Adapter RIA-1. Point-to-multipoint communication for connecting up to three hand units with one camera devi...

Individual Components

ZMU-4 Zoom Main Unit Body

K2.0039926

ZMU-4 body without radio module and accessories. Every ZMU-4 ships with one ZMU-4 ARRI Rosette mounted on the unit. Please note: Radio module and batteries are not include...
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Rosette Adapter RA-7

K2.0041744

The Rosette Adapter RA-7 allows to attach the Zoom Main Unit ZMU-4 to a Handgrip Pan Bar Adapter or Handgrip Extension.
Rosette Adapter RA-8

K2.0044203

The Rosette Adapter RA-8 allows to attach the Operator Control Unit OCU-1 to the Zoom Main Unit ZMU-4 to wirelessly control a second lens axis.
ZMU-4 ARRI Rosette

K2.0044543

The ZMU-4 ARRI Rosette can be mounted as a second rosette on the ZMU-4. This second rosette is already premounted on the ZMU-4 when ordering KK.0043770 ZMU-4 Zoom Main Un...

Technical data

Joystick:	Force sensitive joystick
Display:	Transflective TFT-LCD Display (readable in bright sunlight) 0.96“ diagonal
Interfaces:	- 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
Weight:	- 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)