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Category/ News

ARRI ALEXA LF - The New Large-Format Camera System

Tuesday 20th February 2018

ARRI unveiled its new large-format 4K version of the ALEXA sensor at the 2018 BSC Expo in London. The Alexa LF is qualified to shoot native 4K productions in all three camera sensor modes, making it Netflix approved for its original productions. 

ARRI introduces a complete large-format system that meets and exceeds modern production requirements, delivering unprecedented creative freedom. Based on a large-format 4K version of the ALEXA sensor, the system comprises the ALEXA LF camera, ARRI Signature Prime lenses, LPL lens mount and PL-to-LPL adapter. These system elements have been designed to take full advantage of the enlarged sensor, while also offering compatibility with existing lenses, accessories and workflows. 

Featuring a sensor slightly larger than full frame, ALEXA LF records native 4K with ARRI’s best overall image quality. This allows filmmakers to explore an immersive large-format aesthetic while retaining the sensor’s natural colorimetry, pleasing skin tones and stunning capability for HDR and WCG workflows. Versatile recording formats, including efficient ProRes and uncompressed, unencrypted ARRIRAW up to 150 fps, encompass all on-set workflow requirements.

“The larger ALEXA LF sensor has the same optimal pixel size as other ALEXAs, resulting in a 4448 x 3096 image,” says Marc Shipman-Mueller, ARRI Product Manager for Camera Systems. “This doesn’t just add definition, it creates a whole new look—one that is truly immersive, with a three-dimensional feel. The various recording formats and sensor modes make this look available to all productions and satisfy any possible deliverable requirement.”

The first Alexa LF cameras will be available in late March 2018, and an initial set of four Signature Prime lenses will be available in early June. The remaining lenses will be released over the course of the year.


Camera Type

Large Format (LF) digital camera with electronic viewfinder EVF-1 and built-in radios for ARRI Wireless Remote System, ARRI Wireless Video System and WiFi

All current ARRI ALEXA accessories,
LPL lenses and PL lenses with PL-to-LPL adapter
Sensor Mode
LF Open Gate

36.70 x 25.54 mm
4448 x 3096, ø 44.71 mm
ARRIRAW: 0.75 - 90 fps,
ProRes: 0.75 – up to 60 fps
Sensor Mode
LF 16:9

31.68 x 17.82 mm
3840 x 2160, ø 36.35 mm
ARRIRAW: 0.75 - 90 fps,
ProRes: 0.75 – 60 fps
Sensor Mode
LF 2.39:1

36.70 x 15.31 mm
4448 x 1856, ø 39.76 mm
ARRIRAW: 0.75 - 150 fps,
ProRes: 0.75 – up to 100 fps

Electronic rolling shutter, 5.0º - 358.0º
Internal ND Filter

One of 8 available Large Format Full Spectrum Neutral Density (LF FSND) filters can be inserted manually in front of the sensor (ND 0.3 to ND 2.4)

14+ stops
Exposure Index

EI 800
Sound Level

Sound level ≤ 20 db(A) while recording LF Open Gate ProRes 4.5 K 4444 @ 30 fps and ≤ +30° Celsius (≤ +86° Fahrenheit),
measured 1 m/3 feet in front of the lens
Power In

11.5 to 34 V DC
Power Out

4x RS (24 V), 1x 12V (12 V), 1x EXT (24 V), 1x ETH (24 V)
(body + LPL)

7.8 kg/17.2 lbs.
(body + LPL)

L 364 mm/14.33”
W 201 mm/7.91”
H 158 mm/6.22”

-20° C to +45° C (-4° F to +113° F)
Lens Mount

62 mm LPL mount (LDS-1, LDS-2 & /i)
Flange Focal Depth

44 mm

ARRIRAW (.ari)
QuickTime/ProRes (422, 422 HQ, 4444 & 4444 XQ)

4.5K (sensor modes LF Open Gate and LF 2.39:1)
UHD (sensor mode LF 16:9)
2K (in-camera downscale in sensor mode LF 16:9)
HD (in-camera downscale in sensor mode LF 16:9)
Supported Media

SxS PRO+ 256 GB (ProRes)
SXR Capture Drives 1 TB (ARRIRAW or ProRes)
SXR Capture Drives 2 TB (ARRIRAW or ProRes)
Monitor Outputs

MON OUT 1a, 1b and 2: SDI 6G UHD or SDI 1.5G HD up to 30 fps.
MON OUT 3: SDI 1.5 G HD up to 30 fps, also wireless video
Anamorphic de-squeeze for 1.25x, 1.3x, 1.5x, 2x lens squeeze ratios
Image Processing

16 bit linear in ALEXA Wide Gamut/Log C color space
Target output color spaces: Log C, Rec 709 or Rec 2020
Supports ARRI Look File (ALF-2) with CDL values and a 3D LUT
3D LUTs available for SDR, HDR PQ and HDR HLG


1x XLR 5 pin AUDIO IN for 2 channels, line level
angenieux, Leitz, Blackmagicdesign, Sony, ARRI, Canon, ZEISS, Panasonic, SIGMA, Cooke, RED

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