Advanced Lens And Camera Control

The Wireless Compact Unit WCU-4 combines three axes of lens control with a lens data display in a compact and ergonomic housing.


Three Axes - All Inclusive
The Wireless Compact Unit WCU-4 combines three axes of lens control with a lens data display in a compact and ergonomic housing. Weighing around 780 grams including battery, it’s one of the lightest hand units in its class, providing unrivaled comfort during a long working day.

ALEXA Remote Control
An optional software license will enable you to remote control ALEXA Mini, all ALEXA cameras including the Plus Module (except the ALEXA HD Plus) and AMIRA when combined with the Universal Motor Controller UMC-4. This includes setting frame rate, shutter angle, exposure index, false color on the monitor output, and more. Extended camera status information is also available, allowing you to quickly check your camera settings at any time.

Vibrating Markers
Tactile vibrating feedback lets you keep your eye on the action in the most challenging situations. Operators can concentrate on the scene, knowing that the hand unit will vibrate to prompt them when focus markers are reached.
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Backlit Focus Knob
The super-smooth focus knob contains an integrated light source that shines through the wide, optionally pre-marked focus ring in low light conditions, thus providing clearly readable focus marks at all times. The friction of the focus knob can be easily adjusted to one’s personal preference without any tools.

Easy-to-Read Lens Data Display 
Clearly arranged, easy-to-read lens and camera information is available on the large 3” display, along with data from optional ultrasonic distance measurement devices. The transflective display technology ensures perfect readability in all ambient lighting conditions.

Pre-Marked Focus Rings 
Lens scales can be mapped to a set of high quality pre-marked focus rings in metric or imperial scale.

Focus Tracking 
The WCU-4 user button can be configured to activate focus tracking - setting the focus motor to continuously follow a subject by using an ultrasonic distance measurer. Focus tracking works with ARRI's Ultrasonic Distance Measure UDM-1 and ALEXA Plus or Studio cameras or the Universal Motor Controller UMC-4.

Multiple Mounting Options
The Wireless Compact Unit WCU-4 features M4 mounting points on its top and bottom, and the optional WCU-4 Plate (K2.0006501) can attach to either, providing various 1/4-20 UNC and 3/8-16 UNC mounting points itself. When mounted on the bottom, the WCU-4 Plate serves as a table stand or can be used to accept a 3/8-16 UNC spigot for mounting on a C-stand. When mounted on top, it can be used to adapt the WCU-4 to an on-board monitoring system. Weighing only 67 g, the WCU-4 Plate is made of durable, aircraft-grade aluminum.

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Personalized Settings
Various parameters of the WCU-4 can be set up to one’s personal preference. These include the display arrangement, vibration patterns and programmable user button, to name just a few. You can save your preferred settings on an SD card, enabling you to immediately personalize any WCU-4, anywhere in the world. 

Exceptional Quality and Service
The WCU-4 is completely splash-proof and embodies the reliability and durability for which ARRI is famous. Wear and tear parts are replaceable at rental level, and the worldwide ARRI Service network ensures rapid second level support if needed. New firmware versions can be installed to the unit via SD card within seconds. 
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Compatible to:

  • Universal Motor Controller UMC-4
  • Single Motor Controller SMC-1
  • ENG Motor Controller EMC-1
  • Active Motor Controller AMC-1
  • ALEXA Mini
  • ALEXA Plus
  • ALEXA Plus 4:3
  • ALEXA XT Plus
  • ALEXA SXT Plus
  • ALEXA Studio
  • ALEXA XT Studio
  • ALEXA SXT Studio
  • ALEXA 65
  • ARRICAM, ARRI 416PLUS, ARRI 435 Extreme equipped with white radio (basic functionality)

Special Features: Built-in vibration motor for tactile feedback
Focus knob: LED backlit rotary knob with adjustable friction, 3.0” diameter
16 bit native encoder resolution
Iris Slider: Fully sealed, splash- and dust-proof slider mechanism 
14 bit native encoder resolution
Zoom Knob: Force sensitive knob 
Ergonomic design

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Display: Transflective TFT LC-Display (readable in bright sunlight) 
3.0 inch diagonal
Housing: Durable and robust housing made of high-strength anodized aluminum 
Sealed assembly with backlit display buttons and index marker
Mass: Approx. 780 grams including battery
Power Supply: NP-FM500H battery (Sony) or compatible batteries 
BC-QM1 battery charger (Sony) or compatible chargers 
Power via LCS cable through ARRI camera (cabled mode)
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Operating Temperature: -20°C to +45°C
Software Updates: Via SD card
Supplied Accessories: 1x user manual (english) 
1x hand strap 
1x lanyard 
1x plain white focus ring