ARRI ZMU-4 Main Unit Basic Set

Overview
Please note: Batteries and battery charger are not included. The ZMU-4 is a versatile zoom control unit that comes with a white-coded RF-EMIP radio module and accessories. It is compatible with all ARRI cameras with integrated radio (white coded) and wireless motor controllers such as RIA-1, cforce mini RF, and UMC-4. The ZMU-4 Basic Set also includes a second ZMU-4 ARRI Rosette mounted on the unit.

The ZMU-4 offers a modern take on the classic zoom control, with its rugged, weather-resistant, and ergonomic design. It seamlessly transitions between wired and wireless configurations and supports various radio modules for different regions and shooting situations. Additionally, it can act as a radio module for other LBUS control devices, making it a versatile and essential tool for any camera setup. With its innovative display, configurable control, and interchangeable radio modules, the ZMU-4 streamlines camera builds and enhances on-set workflows. It is also compatible with both standard Sony batteries and ARRI LBP-3500 batteries, providing long-lasting power and efficient battery management. The ZMU-4 is a must-have for any professional camera setup.

Included in box
1 x K2.0039926, ZMU-4 Zoom Main Unit Body
1 x K2.0033702, RF-EMIP Radio Module 2400 MHz DSSS
1 x K2.0041744, Rosette Adapter RA-7
1 x K2.0044203, Rosette Adapter RA-8
1 x K2.0044543, ZMU-4 ARRI Rosette

About the ARRI ZMU-4 Main Unit Basic Set
Please note: Batteries and battery charger are not included.

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 wireless motor controllers like RIA‑1, cforce mini RF or UMC-4. The ZMU‑4 Basic Set comes with a second ZMU‑4 ARRI Rosette mounted on the unit.

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 fast on-set workflows.

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 customisable shortcuts for the operator and dedicated zoom speed buttons fall nearly 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, tripod head, or bridge plate. 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.

Joystick Force sensitive joystick
Display Transflective TFT-LCD Display (readable in bright sunlight) 0.96“ diagonal
Interfaces 1 x LBUS (LEMO 4pin) for lens motors, daisy chainable; supports LBUS protocol, LCS protocol (for ALEXA cameras) and EXT protocol (for AMIRA cameras)
1 x CAM (LEMO 7-pin) for camera control
1 x USB-C for software updates
1 x ARRI Radio Module Interface
1 x Battery Interface
Mounting points 2 x 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 Type (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)