WCU-4 Header

Wireless Compact Unit WCU-4

It´s all in your hands

WCU-4 klein rechts (2)
Advanced Lens and Camera Control

The Wireless Compact Unit WCU-4 is a lightweight, ergonomic hand unit offering up to 3-axis lens control. Rugged and splash-proof, it features an easy-to-read lens data display, lens mapping to pre-marked focus rings and focus tracking, for example of the slate at the beginning of a shot.

Features

Best overall production value 

  • Ergonomic 3-axis lens control
  • ARRI camera remote control
  • Lens programming interface
  • Backlit focus knob with adjustable friction
  • Easy-to-read lens data display
  • Lens mapping to pre-marked focus rings
  • Support of the OCU-1 or Master Grips override function

Useful features

  • Distance measurement readout
  • Focus tracking function
  • Remote REC and tally
  • Personalized settings
  • Playback function
  • Vibrating markers

Useful Features

  • Camera remote control functionality for ALEXA Mini LF, ALEXA Mini, AMIRA when used with the UMC-4 motor controller or cforce mini RF, ALEXA Plus, XT Plus, Studio, XT Studio, SXTW Plus and 65.

Compatibility

WCU-4 or SXU-1 + cforce mini RF + cforce mini/plus motors + AMIRA

WCU-4 or SXU-1 + cforce mini RF + cforce mini/plus motors

WCU-4 or SXU-1 + UMC-4 + CLM motors

WCU-4 or SXU-1 + UMC-4 + cforce mini/plus

WCU-4 or SXU-1 + AMC-1 + cforce mini/plus motor

WCU-4 or SXU-1 + SMC-1 + CLM motor

WCU-4 or SXU-1 + EMC-1 + Servo Zoom lens

WCU-4 Dust Klein
Dustproof

Functionality



1 - High-performance radio system for reliable connectivity 

2 - Lens mapping to backlit, pre-marked focus rings

3 - Fluid knob with adjustable friction for precise focus pulls

4 - Full control with lens data display and distance measure readout

5 - Ergonomic design for comfortable prolonged usage

FAQ

  • Yes. You can use the WCU-4 with any camera, using the Universal Motor Controller UMC-4, the cforce mini RF or the Mini Motor Controllers AMC-1, SMC-1 and EMC-1.

  • You can control up to three motors for focus, iris, and zoom. The ALEXA Remote License Key activates remote camera setup capabilities via WCU-4 for ALEXA Plus, ALEXA Plus 4:3, ALEXA XT Plus, ALEXA Studio, ALEXA XT Studio, ALEXA SXT, ALEXA SXT W , ALEXA 65 and ALEXA Mini/Mini LF cameras, as well as for AMIRA if combined with the Universal Motor Controller UMC-4 or the cforce mini RF lens motor.

    This includes the following parameters:

    • Full Playback Control (ALEXA Mini/Mini LF)
    • Sensor Frame Rate
    • Shutter Angle
    • Exposure Index
    • White Balance
    • ND Filter (ALEXA Studio and ALEXA Mini/Mini LF/AMIRA)
    • Peaking on Monitor Output (on/off)
    • Surround View on Monitor Output (on/off)
    • False Color on Monitor Output (on/off)
    • Status Info on Monitor Output (on/off)
    • Frame Lines on Monitor Output (on/off)
    • User Buttons
  • There are many different lenses on the market and we do not have an individual pre-marked ring for all of them. We do have five pre-marked rings with metric scale and five rings with imperial scale. These rings can be mapped to any given lens by using the Lens Data Archive (LDA).

  • There are various ways to make good use of pre-marked rings. You can choose the ring marked with a close focus or minimum object distance (MOD) that is nearest to – but less than – the MOD of your lens. For example, if your lens MOD is 16”, you would choose the 14” focus ring. Or you simply select the ring with the focus scale spread that matches your scene best.

  • Lens data is transmitted to the WCU-4 from the camera device where it is generated  (ALEXA Plus, ALEXA Plus 4:3, ALEXA XT Plus, ALEXA Studio, ALEXA XT Studio, ALEXA SXT, ALEXA SXT W , ALEXA 65 and ALEXA Mini/Mini LF cameras, Universal Motor Controller UMC-4 or the cforce mini RF lens motor).

  • The Lens Data Archive is an archive that contains lens tables. Those lens tables set the raw motor encoder values in correlation to the actual lens scales. Once you choose the right lens table from the Lens Data Archive and calibrate your lens motors, you get the same type of lens data as an LDS lens would deliver. You can create your own lens tables for any given lens with the WCU-4, save it on SD card and transfer it to the ALEXA Mini/Mini LF, the Universal Motor Controller UMC-4 and the cforce mini RF wirelessly.

  • Lens data is generated on the camera side and displayed on the WCU-4. The data is generated in one of two ways:

    1. From LDS lenses, via the internal lens encoders

    2. From the Lens Data Archive (LDA), via the motor encoders

ARRI Journey - ARRI Controller - Marsh-24_lowres
Robust and solid

Quotes

The WCU4 is the most robust, complete and customisable solution I have ever used for wireless focus. It has features that make it far superior to the competition. From real-time DoF on the large backlit screen, to vibrating focus marks, customisable buttons and much more. I love being able to change camera settings right from the handset when the camera is mounted on a crane or arm. 

1st AC Ambar B Capoor (Known for: Lovelace, The Grand Tour, Transparent, Con Man, Rosewood and many more) 

Focus pulling is the art of remembering the past and knowing the future.
The WCU-4 never let me down.

1st AC Karl Keil, BVK (Known for: Homeland, Babylon Berlin, TV-Series and many more)

The WCU-4 is very light, comfortable in my hand and super ergonomically when it comes to mounting and also for the run and gun life. Camera control at your fingertips has been a fantastic tool for steadicam and crane stuff. 

1st AC Brian Aichlmayr (Known for: Playing God, Dropa, Sanitatum, Osprey, Commercials for Brands such as Walmart, Nike, Intel, Reebok, Facebook, Adidas and many more)

For me the WCU-4 was the obvious choice of lens control - most of my jobs are on ARRI cameras, and so being able to control a lot of the settings from my handset is fantastic. I also really like the lens mapping with the easy to see the UDM readout/arrow.

1st AC Julia Green (Known for: Solo: A Star Wars Story, Black Mirror: Bandersnatch, Mary Queen of Scot, The Breaker Upperers, Random Acts and many more)

The biggest advantage of the WCU-4 is that it combines so many features into one compact device. Keeping so much control in your hand in the form of a device makes the daily workflow much easier and helps us to master any new challenges on the job.

1st AC Sasha El Gendi (Known for: Unheimlich perfekte Freunde, Die Kleine Hexe, Smaragdgrün, Heidi, Point Break, Colonia Dignidad and many more)

The dependability and versatility of the WCU4 allows me to achieve everything that has been asked of me no matter what project I have been involved in. 

1st AC Philip A.T. Smith (Known for: Dune, Wonder Woman 1984, The King, John Wick: Chaper 3 – Parabellum, Solo: A Star Wars Story, The Great Wall and many more)

The WCU-4 system, with all its wireless possibilities to control the focus, iris, zoom and the camera settings combined in one unit, allows us on set the most of flexibility and is on top also easy to handle. The perfect all-round tool for today’s 1.ACs.

1st AC Oliver Schill (Known for: Haven: Above Sky, Bliss, Hell, Meiberger – Im Kopf des Täters, Jugend ohne Gott, Nackt. Das Netz vergisst nie and many more)

What I like at the WCU-4 most is its large digital display. In combination with lens data it is very easy to follow the signal of a range finder system. And it is very easy to spread the scale of the lens in Situations I have not much dept of field. 

1st AC Boris Treffert (Known for:  Die Spezialistn – im Namen der Opfer, Jonas Waldek, Keine zweite Chance, Block B – Unter Arrest, DieTrixxer, Headhunter: The Assessment Weekend and many more)


The WCU4 fits easily in your hand and weights barely anything. Its ergonomic design just hasn’t been matched in the newer models of any competing manufacture. It’s also become the standard as newer handsets are always trying to recreate the brilliance of the WCU4’s layout.

1st AC (Focus Puller) Ian Barbella (Known for: Gentefied, Moxie, The Exorcist, Teachers, I Am the Night, Corporate, Wakefied and many more)

The WCU-4 is a compact and very versatile system. I like the fact that all three axis (Focus, Iris and Zoom) can be operated from only one device and that I can occupy each unit individually. The WCU guarantees a fast and precise work on the set.

1st AC Manuel Steer (Known for: Papa auf Wolke 7, Flucht durchs Höllental, Die Rosenheim Cops, Das Ende der Wahrheit, Tatort and many more)

Using a WCU-4 when shooting on an Arri camera always makes a lot of sense for the additional camera control it gives, however even when using other manufacturers cameras it is still my go to choice. 

1st AC Matt Choules (Known for: Britannia, Dark Encounter, And We Go Green, The Revenger: An Unromantic Comedy, Berlin Station, Solis and many more)

The WCU-4 is a precise tool for focus pulling, allowing me to easily retain control over the most used settings of the camera. Alongside of that, I find the customizability of its settings to suit my needs and the integration of distance measurements very useful. 

1st AC Aurel Wunderer, BVK (Known for: Guns Akimbo, die kleine Hexe, Euphoria, The Putin Interview, Buddenbrooks, Nirgendwo in Afrika, Die Manns – Ein Jahrhundertroman and many more)


The reason I work with WCU-4 is because it's fast, precise, reliable, smart and easy to work with.

1st AC Tamás Jánossa (Known for: SAS: Red Notice, The Martian, Tyrant, The Selection, Mars, Genius, Lords of Chaos, Maigret in Montmartre and many more)

The WCU-4 gives me full control of the camera which is incredibly useful when you are working quickly. Specially, on gimbals and on steadicam where you can’t always easily get access to the camera being able to adjust the NDs from the WCU-4 or playback a clip for the director becomes a massive advantage.

1st AC James Hills (Known for: Greater Things, Bloody Cuts, Blackbird and many more)

ARRI WCU-4 Premarked Rings meter

Recommended Products

Pre-Marked Focus Ring 0.20m for WCU-4

K2.0001651

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 0.25m for WCU-4

K2.72129.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, , ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 0.35m for WCU-4

K2.72130.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 0.50m for WCU-4

K2.72131.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 1.00m for WCU-4

K2.72132.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 8in for WCU-4

K2.0001652

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 12in for WCU-4

K2.72133.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 14in for WCU-4

K2.72134.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 20in for WCU-4

K2.72135.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Pre-Marked Focus Ring 3´6 for WCU-4

K2.72136.0

Enables focus mapping with Wireless Compact Unit WCU-4 and Universal Motor Controller UMC-4, all ALEXA cameras with Plus module, ALEXA Mini, ALEXA Mini LF and cforce mini RF.

Plain White Focus Ring for WCU-4, SXU-1

K2.72117.0

Works with Wireless Compact Unit WCU-4 or Single Axis Unit SXU-1.

WCU-4 Plate

K2.0006501

Lightweight cheeseplate for WCU-4. Serves as a table stand or can be used to accept a 3/8” spigot for mounting on a C-stand. Can be used to adapt to an on-board monitoring system.

WCU-4 Monitor Bracket

K2.0008271

Mounts on top of the WCU-4 hand unit and attaches to on-board monitors with 1/4-20 UNC interface.

Carrying Case for WCU-4 and Accessories

K2.72146.0

With compartments for one WCU-4, 10 marking rings, 3 batteries, one charger, three CLM motors, one Universal Motor Controller, one ZMU-3A with pan handle, various gear rings, cables and mounting accessories.

ALEXA Remote License for WCU-4

10.0000268

Enables the Wireless Compact Unit WCU-4 to change settings on all ALEXA Plus, ALEXA Studio, ALEXA SXT W, ALEXA LF, ALEXA 65, ALEXA Mini, ALEXA Mini LF and AMIRA (when used with the cforce mini RF/Universal Motor Controller UMC-4) cameras. Available from ARRI License Shop: www.alshop.arri.de

Related Products

ALEXA Mini LF

K1.0024074

Combining the compact size and low weight of the popular ALEXA Mini with the large-format ALEXA LF sensor, ALEXA Mini LF brings exciting new creative possibilities to ARRI’s large-format camera system.

ALEXA Mini

K0.0014799

Compact, lightweight, and self-contained - ARRI ALEXA Mini is the small and versatile allrounder in the ARRI camera family.

Alexa LF

K1.0014861

ARRI's new large-format camera system consists of the ALEXA LF camera, ARRI Signature Prime lenses, LPL lens mount and PL-to-LPL Adapter. Featuring a sensor slightly larger than full frame, the ALEXA LF camera records native 4.5K with ARRI’s best overall image quality.

cforce mini RF Basic Set

KK.0016804

The cforce mini RF is an intelligent lens motor with integrated white-coded ARRI radio module, eliminating the need for an additional receiver unit mounted on the camera. The cforce mini RF can pair with up to three hand units for split focus, iris and zoom operation and provides full lens data when used with the WCU-4 hand unit.

Universal Motor Controller UMC-4

K2.0002058

The Universal Motor Controller UMC-4 is an advanced 3-axis motor controller. By incorporating ARRI's LDS Lens Data Archive, the UMC-4 goes beyond mere camera and lens control to offer the added value of lens data that is useful both on set and in post.

ENG Motor Controller EMC-1

K2.0001474

Motor Controller for use with ENG-type lenses such as Fujinon Cabrio zooms. Controls the integrated focus, iris, and zoom motors of such ENG lenses and provides lens data for display on the WCU-4 hand unit. Works with WCU-4, SXU-1, Master Grips and pan-bar zoom (cmotion).

Active Motor Controller AMC-1

K2.0005872

Compact motor controller with an LBUS interface connecting to up to three daisy-chained cforce motors. Works with WCU-4, SXU-1, Master Grips and pan-bar zoom (cmotion).

Single Motor Controller SMC-1

K2.0001469

Compact 1-axis wireless motor controller designed for weight and size-critical setups such as Steadicam or camera drones. Drives a single CLM motor and is the perfect counterpart for the SXU-1 single-axis hand unit. Also works with WCU-4, Master Grips and pan-bar zoom (cmotion).

Operator Control Unit OCU-1

K2.0020002

The Operator Control Unit OCU-1 is an addition to the WCU-4 lens control system on ALEXA Mini, and enables operators to over-ride and return focus, iris, and zoom controls at the touch of a button. It gives camera operators full control of their lenses when they want it. The OCU-1 will help to save precious time while framing shots, as the camera operator will always have the ability to control the lens, even when motors are attached.

Master Grips

K2.0009363, K2.0009490, K2.0009493, K2.0009494

Solid, ergonomic camera handgrips with assignable user buttons and control rocker for super-smooth zooming. Includes steel ARRI rosette and LBUS interfaces.

Cables & Power Supplies

Hand Unit AC Power Supply HPS-1

K2.0000425

AC power supply adapter for SXU-1 and WCU-4.

Cable EXT (7p) - LCS (5p)

K2.0007624

Adapts ALEXA Mini, ALEXA Mini LF EXT connector to LCS cables.

Cable LCS (5p) - LCS (5p) (3.5m/11ft)

K2.0002136

Connects ARRI hand units and motor controllers for wired operation.

Cable LCS (5p) - LCS (5p) (coiled)

K2.0002141

Connects ARRI hand units and motor controllers for wired operation.

LCS Cable Drum Extension (75m/250ft)

K2.41389.0

Connects ARRI hand units and motor controllers for wired operation. Use with cable LCS to LCS (K2.0002136)

SONY NP-FM500H Battery

K2.47851.0

Powers Wireless Compact Unit WCU-4 and Single Axis Unit SXU-1.

SONY BC-QM1 Battery Charger

K2.0002065

Charges NP-FM500H battery.

Downloads

2020-04-22
Camera System Highlights - Brochure 2020
2018-12-17
WCU-4 Wireless Compact Unit - Manual
2020-02-12
WCU-4 SUP 3.3
2020-02-12
WCU-4 SUP 3.3 Release Notes
2018-12-12
WCU-4 SUP 3.2
2018-12-12
WCU-4 SUP 3.2 Release Notes
2018-12-04
WCU-4 SUP 3.1.17
2018-12-04
WCU-4 SUP 3.1.17 - Release Notes
2018-12-04
WCU-4 SUP 3.0.7
2018-12-04
Wireless Compact Unit WCU-4 SUP 3.0
2018-12-04
WCU-4 SUP 2.2.26
2018-12-04
WCU-4 SUP 2.2.26 - Release Notes