ALEXA LF

  • Overview
  • Compatibility
  • Workflows
  • Technical Details

Large-format aesthetic with ALEXA image quality

Featuring a sensor slightly larger than full frame, ALEXA LF records native 4.5K 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.

Three sensor modes for limitless applications

ALEXA LF has the largest sensor of any full-frame cinema camera on the market. Maintaining the ALEXA family’s optimal pixel size for best overall image quality results in a 4448 x 3096 picture, which can be recorded in full, up to 90 fps, using the LF Open Gate mode. An LF 16:9 mode maximizes lens options while meeting 4K deliverable standards, and an LF 2.39:1 mode combines a cinematic widescreen image with high frame rates up to 150 fps for sensuous slow motion. All sensor modes offer true 800 ASA sensitivity as well as reduced noise, providing the perfect canvas for modern, subtle lighting techniques.

ARRIRAW 90 fps
ProRes 422 60 fps
ProRes 422 HQ 60 fps
ProRes 4444 60 fps
ProRes 4444 XQ 40 fps
ARRIRAW 90 fps
ProRes 422 60 fps
ProRes 422 HQ 60 fps
ProRes 4444 60 fps
ProRes 4444 XQ 60 fps
ARRIRAW 150 fps
ProRes 422 100 fps
ProRes 422 HQ 100 fps
ProRes 4444 100 fps
ProRes 4444 XQ 60 fps

A larger mount for a larger format

A crucial element of this new system is the LPL lens mount, optimized for large-format sensors. A wider diameter and shorter flange focal depth allows the ARRI Signature Prime lenses and all future large-format optics to be small and lightweight, with a fast T-stop and pleasing bokeh—a combination of features that would not be possible within the confines of the PL lens mount. The LPL mount will also be available for other ARRI cameras such as the ALEXA Mini, and is being licensed to third-party lens and camera manufacturers.

Total lens and accessory compatibility

Although the camera, lens mount and lenses are new, full compatibility with existing PL mount lenses and ALEXA accessories is a cornerstone of the system's design. A PL-to-LPL adapter offers backwards compatibility with all PL mount lenses, be they Super 35 or full frame. The adapter attaches securely to the LPL lens mount without tools, allowing crews to rapidly switch between PL and LPL lenses on set. Cinematographers are therefore offered an unlimited lens choice, with complete lens metadata accessible from LDS-2, LDS-1 or /i lenses.

For even further cross-system compatibility, an LPL lens mount can be fitted to existing ALEXA, ALEXA Mini and AMIRA cameras. ARRI Signature Primes and other future LPL mount lenses can therefore be used for both Super 35 and large format on productions combining the two.

ALEXA LF is based on the proven, robust ALEXA camera design, so all existing accessories will work right out of the box. Since all other features and the user interface are the same as in the ALEXA SXT W—including the integrated wireless video transmitter and the user interface—crews will adapt quickly.

Simple ARRI workflows

ALEXA LF offers the same tried-and-true, versatile workflows as other ALEXA cameras. Following the 16-bit internal image processing, recording at various resolutions is possible in uncompressed, unencrypted ARRIRAW or fast, efficient ProRes. Existing ARRI Look Files can be used with ALEXA LF, and the entire range of ARRI workflow software tools supports ALEXA large-format images. Lens metadata can be recorded from LDS-1, LDS-2 or /i capable lenses.

Helpful tools and applications

ARRI Lens Illumination Guide
A visual online guide to how different lenses illuminate different sensor sizes, sensor modes, and target aspect ratios.

ARRI Frameline Composer
Easily create custom framelines online, based on your specific requirements.

Formats & Data Rate Calculator
Calculate duration and data rates online for ARRI cameras.

ALEXA LF Camera Simulator
An interactive online training tool for familiarizing yourself with the menu navigation of the ALEXA LF camera.

ARRI Color Tool

Create and load CDLs and 3D LUTs into ARRI cameras with this free-of-charge application.

ARRIRAW Converter

View and convert ARRIRAW for postproduction with this free-of-charge application.

ARRIRAW Converter

View and convert ARRIRAW for postproduction with this free-of-charge application.

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
Compatibility 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
Shutter 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)
Exposure
Latitude
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 19.5 to 34 V DC
Power Out 4x RS (24 V), 1x 12V (12 V), 1x EXT (24 V), 1x ETH (24 V)
Weight
(body + LPL)
7.8 kg/17.2 lbs.
Dimensions
(body + LPL)
L 364 mm/14.33”
W 201 mm/7.91”
H 158 mm/6.22”
Operating Temperature -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
Recording Codecs ARRIRAW (.ari) QuickTime/ProRes (422, 422 HQ, 4444 & 4444 XQ)
Recording Resolutions 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
Playback ARRIRAW or ProRes
Audio 1x XLR 5 pin AUDIO IN for 2 channels, line level

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