ALEXA SXT Plus

  • Overview
  • Plus Features
  • Technical Data

The All-Rounder

The ALEXA SXT Plus is the most versatile and flexible of the ALEXA SXT cameras, a true all-rounder. With an integrated wireless radio for camera and lens remote control, tilt/roll sensors, electronic horizon and additional connectors for camera and lens control, signal output and accessory power, the ALEXA SXT Plus offers the best value and widest range of uses.

ALEXA SXT Family Features

BEST OVERALL IMAGE QUALITY
  • Film-like, organic look
  • High Dynamic Range
    • 14+ stops dynamic range over the entire EI range as measured with the ARRI Dynamic Range Test Chart
    • future proof for High Dynamic Range (HDR) displays
    • 16 bit in-camera processing
    • gentle highlight roll-off
    • low noise floor
    • holds up extremely well when over or underexposed
  • Sharp, natural images for HD, 2K, 4K UHD and 4K Cine deliverables
  • Unique tall sensor is ideal for anamorphic shooting
  • High Frame Rate (HFR)
    • up to 120 fps in full image quality
  • High sensitivity
    • true base sensitivity of EI 800
    • adjustable from EI 160 to EI 3200
  • ARRI color science
    • natural color reproduction, especially for skin tones
    • excellent color separation
    • great at resolving mixed color temperature sources
    • optional mild ARRI Noise Reduction (ANR)
EFFICIENT AND VERSATILE WORKFLOWS
  • Multiple recording and monitoring options
    • record/playback ARRIRAW or ProRes
    • multiple recording media
    • great choice of 14 recording formats
    • ARRI Look Management
    • super flexible on-set monitoring
    • embedded rich metadata in ARRIRAW, ProRes and HD-SDI out
  • In-camera ARRIRAW
    • uncompressed, unencrypted raw sensor data
    • maximum image quality from ALEXA
    • greatest flexibility in post
    • best option for future-proof archiving
    • published in SMPTE RDD 30 and 31
  • In-camera Apple ProRes
    • small files through compressed color image data
    • native Final Cut Pro X support
    • ProRes HD, 2K, 3.2K and 4K
    • ProRes 422, 422 HQ, 4444 and 4444 XQ
    • in-camera de-squeezed anamorphic formats
    • redundant, safe recording to XR and SXR Capture Drives
    • pre-recording
  • Multiple recording media
    • XR and SXR Capture Drives
    • SxS PRO and SxS PRO+ cards
    • CFast 2.0 cards
  • 14 recording formats
    • Carefully fine-tuned recording options for any production
    • All sensor modes in ARRIRAW and ProRes
    • Multiple resolutions: HD, 2K, 3.2K, 3.4K, 4K UHD and 4K Cine
    • In-camera de-squeezed ProRes for most economical anamorphic shooting
  • ARRI Look Management
    • Comprehensive look management from preproduction to post
      • maintains, protects and shares the cinematographer's intended look on-set, in dailies and in editing
      • wide range of unique looks possible
      • same look file and tools for ALEXA SXT, ALEXA Mini (SUP 4.0) and AMIRA (SUP 4.0)
      • new ARRI Look File contains name of target color space, CDL values and 3D LUT
    • ARRI Look File is always stored in metadata for
      • live grading on set
      • automated dailies creation
      • editing with looks
  • Super flexible on-set monitoring
    • High Dynamic Range (HDR) monitoring
    • four independent monitoring outputs
    • Rec 709 or Rec 2020 monitoring output
    • frame grabs in various formats and resolutions
    • streaming metadata in HD-SDI for immediate use
  • Stand-alone applications
    • ARRIRAW Converter (ARC)
    • ARRI Color Tool (ACT)
    • ARRI Meta Extract (AME)
  • Stand-alone online tools
    • ALEXA Camera Simulator
    • ARRI Lens Illumination Guide
    • ALEXA Frameline Composer
    • LUT Generator
  • Shared code with third parties
SIMPLE AND SAFE OPERATION
  • ARRI Product Quality
    • Rugged and reliable
    • sealed electronics compartment
    • unique cooling system
    • stable lens mount/sensor holder
    • continuous file closing protects footage
    • ARRIRAW checksum for safe and fast downloading
    • self-healing metadata
    • three auto-switching power inputs
  • Intuitive, easy to use controls
    • same interface on all ALEXA models
    • on-camera and EVF-1 controls
    • remote control through WCU-4, RCU-4 and Web Remote
  • High quality internal Full Spectrum Neutral Density (FSND) filters
    • neutral color balance at all densities from ND 0.3 to ND 2.4
  • High quality electronic viewfinder
  • Powerful assistive displays, including
    • surround view
    • anamorphic de-squeeze
    • false color exposure check
    • smooth mode for better motion portrayal
    • peaking focus check
    • electronic horizon
    • compare stored image with live image
    • RETURN IN video
  • Well balanced, ergonomic body design
  • Global ARRI service network
OPEN, FUTURE-PROOF ARCHITECTURE
  • Compatibility with industry standards
    • Super 35 PL mount and Panavision mount lenses
    • Apple ProRes, HD-SDI
    • SxS PRO, SxS PRO+ and CFast 2.0 cards
    • Gold mount or V-lock on-board batteries
    • 12 or 24 V power inputs and outputs
    • support for ARRI ECS and cmotion cvolution wireless lens control systems
  • Shared code through ARRI Partner Program
    • ARRIRAW Software Developers Kit (SDK)
    • ARRI Look Management library
    • Camera Access Protocol (CAP)
    • ARRI Metadata Bridge (AMB) library
    • White papers and information about ARRI color science
  • Flexible upgrade options
    • upgradable in-camera recording module
    • upgradable electronics interface module (Plus side panel)
    • Exchangeable Lens Mount (ELM)
    • free Software Update Packets (SUPs)
  • Long and reliable product cycles

ALEXA SXT Plus Features Overview

  • Built-in remote control features
    • real-time wired or wireless remote control of lens and camera
    • plug and play with ARRI Electronic Control System (ECS)
    • compatible with cmotion cvolution lens control systems
  • Additional outputs
    • additional clone of MON OUT 1 (1.5G HD-SDI)
    • a third RS accessory power out
  • Built-in tilt and roll sensors
    • for electronic horizon in viewfinder and metadata
    • stored in metadata

ALEXA SXT Plus Technical Data

Camera Type
35 format film-style digital camera with an electronic 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
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
16:9 0.75 - 120 fps 6:5 0.75 - 96 fps 4:3 0.75 - 96 fps Open Gate 0.75 - 90 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 click here
Shutter
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 built-in Internal Filter Module (IFM-1) filter holder that accepts one of eight Full Spectrum Neutral Density (FSND) filters through manual insertion/removal.
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 Plus body with PL mount: 6.9 kg/15.1 lbs. ALEXA SXT Plus body with PL mount, electronic viewfinder, viewfinder cable, viewfinder mounting bracket and handle: 8.4 kg/18.6 lbs.
Dimensions
ALEXA SXT Plus body with PL mount: Length: 331 mm/13.03”, width: 189 mm/7.44”, height: 157.8 mm/6.21”; 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
Low latency (≤1 frame delay) electronic color viewfinder ARRI EVF-1 with 1280 x 784 F-LCOS micro display (image: 1280 x 720, status bars: 1280 x 32 above and 1280 x 32 below image) and ARRI LED illumination, both temperature controlled. Image can be flipped for use of viewfinder on camera left or right. Viewfinder Mounting Bracket allows movement of viewfinder forward/backwards, left/right, up/down, 360 degree rotation and placement on camera left or right. EVF-1 controls: viewfinder and basic camera settings, ZOOM button (2.25x magnification 'pixel to pixel'), EXP button (false color exposure check) and jog wheel.
Assistive Displays
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. 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
Note: Technical data based on SXT Software Update Packet SUP 1.0. All data subject to change without notice.

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