The Flagship
At the pinnacle of the Super 35 format ALEXA range is the ALEXA SXT Studio, featuring a quiet, rotating mirror shutter with adjustable shutter angle and an optical viewfinder that provides real-time, high-contrast images. The ALEXA SXT Studio is a direct response to cinematographers’ requests for a camera that perfectly combines cutting-edge digital image acquisition with traditional elements of the film cameras they have known and trusted for generations.

ALEXA SXT Family Features

  • BEST OVERALL IMAGE QUALITY
  • EFFICIENT AND VERSATILE WORKFLOWS
  • SIMPLE AND SAFE OPERATION
  • OPEN, FUTURE-PROOF ARCHITECTURE

ALEXA SXT Studio Technical Data
Camera Type
35 format film-style digital camera with an optical viewfinder, a 16:9, 6:5, 4:3 or Open Gate switchable active sensor area, built-in support for the ARRI Wireless Remote System and the cmotion cvolution lens control system, built-in filter holder, Lens Data System, integrated shoulder arch and receptacles for 15 mm lightweight rods
Sensor
35 format ALEV III CMOS sensor with Bayer pattern color filter array.
Photo Sites
Sensor Mode 16:9
2880 x 1620 used for 16:9 ARRIRAW 2.8K
3168 x 1782 used for 16:9 ARRIRAW 3.2K
2880 x 1620 down sampled to 1920 x 1080 16:9 ProRes HD
2880 x 1620 down sampled to 2048 x 1152 for 16:9 ProRes 2K
3200 x 1800 used for 16:9 ProRes 3.2K
3200 x 1800 up sampled to 3840 x 2160 for 16:9 ProRes 4K UHD

Sensor Mode 6:5
2578 x 2160 used for 6:5 ARRIRAW 2.6K
2560 x 2146 down sampled to 2048 x 858 for 6:5 ProRes 2K Anamorphic
2560 x 2146 re-sampled to 4096 x 1716 for 6:5 ProRes 4K Anamorphic

Sensor Mode 4:3
2880 x 2160 used for 4:3 ARRIRAW 2.8K
2880 x 2160 used for 4:3 ProRes 2.8K

Sensor Mode Open Gate
3424 x 2202 used for Open Gate ARRIRAW 3.4K
3424 x 2202 used for Open Gate ProRes 3.4K
3414 x 2198 up sampled to 4096 x 2636 for Open Gate ProRes 4K Cine
Operating Modes
Mirror shutter on or off. Switching takes approximately 3 seconds.
16:9, 6:5, 4:3 or Open Gate sensor modes. Switching takes approx. 60 seconds. All sensor modes available in ARRIRAW and ProRes.
Frame Rates
Mirror shutter off
16:9
0.75 – 120 fps
6:5
0.75 – 96 fps
4:3
0.75 – 96 fps
Open Gate
0.75 – 90 fps

Mirror shutter on
16:9
0.75 – 60 fps
6:5
0.75 – 60 fps
4:3
0.75 – 60 fps
Open Gate
0.75 – 60 fps

All speeds adjustable with 1/1000 fps precision. Some limitations based on recording media or recording format apply.
For a detailed table of frame rates for ALEXA SXT Studio with Mirror Shutter off click here
For a detailed table of frame rates for ALEXA SXT Studio with Mirror Shutter on click here

 

Shutter
Rotating mirror shutter: 11.2º – 180.0º. Shutter angle setting precision: 1/10 degree. At some frame rates mirror shutter needs to be less than 180º.
Electronic rolling shutter, 5.0º – 358.0º up to 60 fps; 5.0° to 356° above 60 fps. Shutter angle adjustable with 1/10 degree precision.
Filters
Permanent filters in front of the sensor: optical low pass, UV, IR. Includes a sealed behind-the-lens motorized filter mechanism that provides an optical flat or ND 1.3 (4.3 stops).
Exposure Latitude
14+ stops for all sensitivity settings from EI 160 to EI 3200, as measured with the ARRI Dynamic Range Test Chart (DRTC).
For a graphic of how the exposure latitude shifts at different EIs, click here
Exposure Index
Values behind the exposure index are the number of stops above and below 18% grey.
White Balance
Presets for 3200 (tungsten), 4300 (fluorescent), 5600 (daylight) and 7000 (daylight cool). Automatic calculation or manual white balance for 2000 to 11000 Kelvin, adjustable in 100 K steps
Color Correction
While white balance changes the red/blue hue of the image, color correction changes green/magenta. Adjustable range from -12 to +12 CC. 1 CC corresponds to 035 Kodak CC values or 1/8 Rosco values.
Sound Level
Under 19 db(A) while recording ProRes 4444 16:9 HD @ 24 fps and ≤ +30° Celsius (≤ +86° Fahrenheit) with lens attached and fan mode set to ‘Regular’, measured 1 m/3 feet in front of the lens. Silent operation at higher temperatures possible with fan mode set to ‘Rec low’.
Power In
Three possible inputs: BAT connector, optional battery adapter back or optional battery adapter top. All inputs accept 10.5 to 34 V DC. Approx. 90 W power draw for camera and EVF-1 in typical use recording ProRes at 24 fps to an SxS PRO card at room temperature, without accessories. Initial power draw during power up is higher.
Power Out
12 V connector: limited to 12 V, up to 2.2 A. RS, EXT and ETHERNET: input below 24 V is regulated up to 24 V; above 24 V: input voltage = output voltage. RS and EXT connectors combined are limited to 2.2 A. ETHERNET is limited to 1.2 A. Maximum power draw is also limited by the power source.
Weight
ALEXA SXT Studio body with PL mount: 8.2 kg/18.1 lbs.
ALEXA SXT Studio body with PL mount, electronic viewfinder, viewfinder cable, viewfinder mounting bracket and handle: 9.8 kg/21.7 lbs.
ALEXA SXT Studio body with PL mount, optical viewfinder and handle: 10.3 kg/22.8 lbs.
Dimensions
ALEXA SXT Studio body with PL mount: Length: 364 mm/14.33”, width: 189 mm/7.44”, height: 163 mm/6.42”; dimensional drawings available in the ALEXA manual
Environmental
-20° C to +45° C (-4° F to +113° F) @ 95% humidity max, non-condensing. Splash and dust proof through sealed electronics. System cooling through radiator/single fan.
Lens Mount
54 mm stainless steel LDS PL mount, Super 35 centered. 52.00 mm nominal flange focal depth without FSND filters.
Viewfinder
Bright, high contrast optical viewfinder OVF-1 for through-the-lens viewing with low distortion, accurate color fidelity and no delay. Rotates to left and right of camera body and telescopes closer/farther from camera body. Automatically keeps an upright image with an optional manual image rotation. Includes a flip in ND 0.6 contrast filter and de-squeeze optics for 2x anamorphic lenses (1.3x de-squeeze module also available). Includes Basic Insert Module BIM-1 for RGB frame glow. Compatible with 8x and 10x 435 eyepieces, 435 eyepiece extensions and all ARRIFLEX and ARRICAM heated eyecups. With the optional ARRICAM Eyepiece Adapter AEA-1, the OVF-1 can accept the 8x ARRICAM Studio eyepiece or ARRICAM Studio Viewfinder Extension Medium. Not compatible with ARRICAM Studio Anamorphic Extension, ARRICAM Studio Viewfinder Zoom Extension and Lite Universal Eyepiece. ALEXA Studio ground glass and frameglow holder are compatible to the ARRICAM system, but only ALEXA Studio ground glasses and glow masks provide exact alignment of framelines and captured frame.
The OVF-1 can be replaced with the ALEXA Electronic Viewfinder EVF-1 with an Electronic Viewfinder Adapter EVA-1. The EVF-1 is a high quality, low latency (≤1 frame delay) electronic color viewfinder with a 1280 x 784 F-LCOS micro display.
Assistive Displays
For OVF-1: Warning LEDs for REC (recording), BAT (battery low), FULL (media full).
For EVF-1 and MON OUT: preset and custom frame lines, user rectangles, surround view, 180º image rotation, camera status, false color exposure check, peaking focus check, compare stored image with live image, RETURN IN video and anamorphic de-squeeze. For MON OUT additionally: Reel & clip number.
For a graphic of which false color indicates which exposure level click here
Control
Camera right: Main user interface with a 3” transflective 400 x 240 pixel LCD color screen, illuminated buttons, button lock and jog wheel. Camera left: Operator interface with illuminated buttons and button lock. Camera acts as a web server, displaying the ALEXA Web Remote on web browsers of computers connected to ETHERNET connector. MIRROR PARK buttons: VIEW/GATE. Optional accessory Remote Control Unit RCU-4 for cabled remote control via camera ETHERNET connector. Optional accessory Wireless Compact Unit WCU-4 for wireless remote control (UMC 3A or UMC-4 required).
Recording Codecs
Uncompressed and unencrypted ARRIRAW or compressed and unencrypted QuickTime/ProRes recording. All formats include embedded audio, timecode and metadata.
For more details click here
Recording Media
SxS PRO or SxS PRO+ cards (requires SxS Adapter 2)
CFast 2.0 cards (requires CFast 2.0 Adapter 2)
XR Capture Drives (requires XR Adapter)
SXR Capture Drives (requires SXR Adapter)

Note: XR Capture Drive Docks require Codex Production Suite to read XR Capture Drives recorded with ALEXA SXT.

Supported Media
SxS PRO 64 GB (SBP-64A)
SxS PRO+ 64 GB (SBP-64B & SBP-64C)
SxS PRO+ 128 GB (SBP-128B & SBP-128C)
LEXAR 3600x CFast 2.0 cards 256 GB
XR Capture Drives 512 GB
SXR Capture Drives 1 TB
SXR Capture Drives 2 TB

Monitor Outputs
4x MON OUT BNC connector for uncompressed 1.5 G HD-SDI video: 1920 x 1080 (16:9), 4:2:2 YCbCr; legal range HD video at 23.976, 24, 25, 29.97, or 30 fps. MON OUT 1b is a clone of MON OUT 1a. Embedded audio, time code, metadata and recording flag.
Image Processing
16 bit linear internal image processing in full ALEXA Wide Gamut/Log C color space. Target output color spaces: Log C, Rec 709 or Rec 2020. An ARRI Look File (ALF-2) containing the name of the target color space, CDL values and a 3D LUT can be applied to ProRes or MON OUT images and will be saved in metadata. Optional horizontal image mirroring.
Synchronization
Master/Slave mode for precision sync of settings, sensor, processing, HD-SDI outputs and ARRIRAW or ProRes recording for 3D applications. PHASE user button for shifting camera phase to move phase artifacts out of frame, i.e. when shooting a CRT monitor or rear screen projector (works in Rec Run TC mode).
Playback
Playback of ARRIRAW or ProRes recorded material visible on EVF-1 and MON OUT. Playback audio available over headphone jack and embedded in the MON OUT signal.
Audio
1x XLR 5 pin AUDIO IN for 2 channel, line level, balanced audio. 24 bit/48 kHz A/D conversion. Uncompressed PCM audio recording to ARRIRAW, ProRes and embedded in all HD-SDI outputs. Only available with same project/sensor speed at 23.976, 24, 25, 29.97 and 30 fps. Max of 2.5 dBm output from AUDIO OUT headphones connector.
Connectors
1x media slot
4x BNC monitoring out HD-SDI, 1.5G MON OUT
1x XLR 5-pin analog audio in AUDIO IN
1x BNC return video in HD-SDI, 1.5G RET/SYNC IN
1x LEMO 16-pin external accessory interface EXT
1x Fischer 2-pin 24 V power in BAT
3x Fischer 3-pin 24 V remote start and accessory power out RS
1x LEMO 2-pin 12 V accessory power out 12 V
1x LEMO 5-pin timecode in/out TC
1x TRS 3.5 mm headphone mini stereo jack AUDIO OUT
1x custom LEMO 16-pin electronic viewfinder EVF
1x custom LEMO 10-pin Ethernet with 24 V power ETHERNET
1x Fischer 5-pin Lens Data Display LDD
2x Fischer 5-pin Lens Control System LCS
1x Fischer 12-pin for CLM-2, CLM-3, CLM-4 or later IRIS
1x Fischer 12-pin for CLM-2, CLM-3, CLM-4 or later FOCUS
1x Fischer 12-pin for CLM-2, CLM-3, CLM-4 or later ZOOM
BNC connectors are designed for fast exchange without camera disassembly. These connectors require a special tool (ALEXA Plus BNC Removal Tool, K5.72915.0).
SD Card
For importing and storing of ARRI Look Files, camera set up files, frame line files and user pixel masks and custom lens tables for the Lens Data Archive (LDA). Stores frame grabs in ARRIRAW (.ari, 12 bit), TIFF (.tif, 16 bit), DPX (.dpx, 10 bit) or JPEG (.jpg, 8 bit) format. Stores log files. Also used for installing Software Update Packets (SUPs).
Upgrades
The Storage Interface Module can be exchanged for future storage modules. The Electronics Interface Module (available as either regular ALEXA or ALEXA Plus versions) can be exchanged for future control electronics. An easily exchangeable lens mount allows other lenses beyond LDS PL mount lenses to be used. Simple camera software updates via free of charge Software Update Packets (SUPs).
Software Tools (apps)
ARRIRAW Converter (ARC)
ARRI Color Tool
ARRI Meta Extract
Software Tools (online)
ALEXA Camera Simulator
Lens Illumination Guide
ARRI Frame Line Composer (AFC)
LUT Generator
ARRI Formats & Datarate Calculator

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