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Use any EF mount lens on ALEXA Mini LF or ALEXA Mini

Compatible with cine-style and still photo EF mount lenses.


The ARRI EF Mount (LBUS) allows the ALEXA Mini LF or ALEXA Mini to accept lenses with an EF mount and it also provides an LBUS connector.

In order to extend the benefits of using EF mount lenses to large-format motion picture productions, ARRI has redesigned its EF mount with a wider light baffle, allowing it to cover the large-format sensor of the ALEXA Mini LF, as well as the Super 35 sensor of the ALEXA Mini.

The use of cine-style EF mount lenses on motion picture cameras has been a popular way to make more affordable optics available to budget-conscious productions. Their mechanical focus rings with physical end stops and industry-standard gears allow the use of external lens motors and precise remote control through ARRI ECS hand units like the wireless WCU‑4 and SXU-1 and the wired Operator Control Unit OCU‑1 and Master Grips. Setup of external lens motors is fast and clean with the LBUS connector on the lens mount, which frees up the EXT connector on the Mini LF and Mini. With the use of the ARRI Lens Data Archive, metadata from the external lens motors will be displayed as well as recorded. 

Additionally, the ARRI EF Mount (LBUS) allows filmmakers to utilize the wide variety of still photo EF mount lenses for insert shots, including vintage lenses, extreme wide-angle lenses, fisheye lenses, tilt-shift lenses, extreme telephoto lenses, macro lenses and other specialist EF mount lenses. For specialty shots, the ARRI EF Mount (LBUS) even powers the image stabilization built into some telephoto EF mount lenses. Since most still photo EF mount lenses have internal iris motors, those can be set by the camera and ARRI ECS hand units.  

Built to ARRI’s exceptionally high standards of durability and reliability, the ARRI EF Mount (LBUS) is suitable for hard-wearing use on professional film sets. 


Use EF mount lenses on ALEXA Mini LF or ALEXA Mini

- Wide light baffle for with large-format and Super 35 sensors

- Use affordable cine-style EF mount lenses 

- Use the wide variety of still photo EF mount lenses 

- Use image stabilization in EF mount telephoto lenses

- Locking ring for secure mounting and stable flange focal distance

Control cine-style EF mount lenses with ARRI ECS hand units

- LBUS connector allows fast and clean setup of external ARRI cforce lens motors

- LBUS connector frees up EXT connector on Mini LF and Mini

- Wireless lens control with WCU‑4 or SXU-1

- Wired lens control with OCU‑1 or Master Grips

- Display and record lens metadata with Lens Data Archive (LDA)

Set iris of still photo EF mount lenses

- On most lenses with 1/4 steps

- Set from camera

- Set from ARRI ECS hand units

Camera Compatibility

The ARRI EF Mount (LBUS) is compatible with the ALEXA Mini LF and ALEXA Mini. The ARRI EF Mount (LBUS) does not physically fit the AMIRA, nor does the AMIRA support the mounts’ LBUS connector. This is why the old, slightly less expensive EF Lens Mount remains available.

Note: LBUS accessories can still be used with AMIRA by using an EXT to LBUS adapter cable to connect the AMIRA to the LBUS accessory. 

The ARRI EF Mount (LBUS) does not require a specific camera Software Update Package (SUP).

TECH TALK Live: The new ARRI EF Mount (LBUS)


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