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ALEXA XT STUDIO

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At the pinnacle of the range is the ALEXA XT Studio (XT = Xtended Technology), featuring a quiet, adjustable mirror shutter and an optical viewfinder that provides a real-time, high contrast image with true colors. Additionally, the ALEXA XT Studio is equipped with an internal motorized ND filter and a DNxHD license. The Studio is a direct response to cinematographers requests for a camera that perfectly combines cutting edge digital image-making with traditional elements of the film cameras they have known and trusted for generations. 

Like all ALEXA XT cameras it has a 4:3 Super 35 sensor, in-camera ARRIRAW recording up to 120 fps, the high-end ProRes 4444 XQ codec, Open Gate sensor mode, internal ND filtration, integrated CDL capture, LDS PL mount, included anamorphic de-squeeze and high speed licenses as well as a new, super silent fan.

Optical Viewfinder
An optical viewfinder offers the most comfortable, accurate and efficient operating experience by showing a bright and sharp full color image through the taking lens. Since they exhibit no motion blur, judging focus during movement is easy, which can save hours of aggravation and re-takes.

With electronic viewfinders, the image from the imaging sensor always needs processing before it can be displayed in the viewfinder, resulting in a delay that is under one frame with the ARRI electronic viewfinder EVF-1 and that can be up to multiple frames with other electronic viewfinders. A delay of multiple frames can be especially confusing when shooting music videos or remotely operating on a crane.

Optical viewfinders show natural motion portrayal, accurate color fidelity and proper white balance, i.e. that of the scene. Operators see exactly what is happening as it happens and experience less eye fatigue. Cinematographers appreciate the ability to judge lighting through the viewfinder and to work with the camera even when it is powered down since choosing lenses, blocking, setting up shots, pre-lighting or rehearsing before the camera is powered up can save precious time on the set. For those situations, where the image is simply too dark for the optical viewfinder to see, the ALEXA XT Studio can be quickly equipped with the ARRI electronic viewfinder EVF-1.

Rotating Mirror Shutter
A mirror shutter is a mirror, located at an angle in front of the sensor, that continuously rotates. Half the time it reflects light up into the optical viewfinder and the other half it lets light fall onto the sensor. Thereby the mirror shutter makes the optical viewfinder possible and determines the exposure. The advantage of a mirror shutter is two-fold: on the one hand it does not exhibit the rolling shutter artifact of electronic shutters, and on the other it provides a natural motion portrayal that is exactly as it was with film cameras.

Motorized ND Filter 
A sealed sliding mechanism places either an optical clear or an ND 1.3 filter (4.3 stops) behind the mirror shutter in front of the sensor. The ND 1.3 ensures a bright image in the optical viewfinder while only attenuating the light hitting the sensor.

Built-in Remote Control Features
With its built-in radio and lens motor electronics, the ALEXA XT Studio makes working on the set faster and more efficient. Plug the ARRI lens motors directly into the camera, turn on the wireless hand unit (like the WCU-4) and off you go. Integrating the wireless and lens control infrastructure into the camera not only saves time, but also weight, as a setup with an ALEXA XT and an external motor control box would be more cumbersome to cable and heavier in sum. Compatibility with the ARRI hand units, like the WCU-4, as well as with the cmotion hand units makes this a supremely flexible tool.

ALEXA XT Studio Technical Data

Camera Type 35 format film-style digital camera with an optical viewfinder, an Open Gate/4:3/16:9 switchable active sensor area, built-in support for the ARRI Wireless Remote System and the cmotion cvolution lens control system, built-in motorized filter slider, Lens Data System and integrated shoulder arch
Sensor 35 format ALEV III CMOS sensor with Bayer pattern color filter array.
Photo Sites 16:9
2880 x 1620 used for ARRIRAW 16:9
2880 x 1620 down sampled to 1920 x 1080 for HD-SDI, ProRes HD 16:9 and DNxHD HD 16:9
2868 x 1612 down sampled to 2048 x 1152 for ProRes 2K 16:9

4:3 Full
2880 x 2160 used for ARRIRAW 4:3 Full
2868 x 2150 down sampled to 2048 x 1536 for ProRes 2K 4:3

4:3 Cropped
2578 x 2160 used for ARRIRAW 4:3 Cropped

Open Gate
3414 x 2198 used for ARRIRAW Open Gate

For a drawing with details about the recording areas, surround views and framelines,
page 1 of 2 click here

For a drawing with details about the recording areas, surround views and framelines,
page 2 of 2 click here

Operating Modes Mirror shutter on or off. Switching takes approximately 3 seconds.

16:9, 4:3 Full, 4:3 Cropped or Open Gate sensor modes. Switching takes approx. 60 seconds. 16:9 available for ARRIRAW, ProRes and DNxHD recording. 4:3 Full available for ARRIRAW and ProRes 2K recording. 4:3 Cropped and Open Gate available for ARRIRAW recording.
Regular or High Speed mode. Switching takes approx. 20 seconds.

Frame Rates 16:9
ProRes HD

Mirror shutter on 0.75 – 60 fps
Mirror shutter off 0.75 – 120 fps
ProRes 2K
Mirror shutter on 0.75 – 60 fps
Mirror Shutter off 0.75 – 60 fps
DNxHD HD
Mirror shutter on 0.75 – 60 fps
Mirror shutter off 0.75 – 120 fps
ARRIRAW
Mirror shutter on 0.75 – 60 fps
Mirror shutter off 0.75 – 120 fps

4:3 Full
ProRes 2K
Mirror shutter on 0.75 – 48 fps
Mirror Shutter off 0.75 – 48 fps
ARRIRAW
Mirror shutter on 0.75 – 60 fps
Mirror shutter off 0.75 – 90 fps

4:3 Cropped
ARRIRAW
Mirror shutter on 0.75 – 60 fps
Mirror shutter off 0.75 – 96 fps

Open Gate
ARRIRAW
Mirror shutter on 0.75 – 60 fps
Mirror shutter off 0.75 – 75 fps

All speeds adjustable with 1/1000 fps precision. To record above 60 fps, the camera needs to be switched to high speed mode.

Note: some limitations based on recording media or recording file settings apply.

For a detailed table of frame rates for ALEXA XT Studio with Mirror Shutter off click here

For a detailed table of frame rates for ALEXA XT Studio with Mirror Shutter onclick 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.
Filter Sealed behind-the-lens motorized filter mechanism provides optical flat or ND 1.3 (4.3 stops).
Permanent filters in front of the sensor: optical low pass, UV, IR
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. These values are for Log C. Rec 709 is the same except for 0.3 stops fewer in the low end at EI 160, 200 and 400.
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 (mirror shutter running) 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. When running over 30 fps with mirror shutter on, voltage of 18V or more is recommended. 95 W power draw for camera and OVF-1 in typical use recording 24 fps to SxS PRO cards at room temperature, mirror shutter on, without accessories.
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 XT Studio body with XR Module: 8.3 kg/18.3 lbs.
ALEXA XT Studio body with XR Module, optical viewfinder and handle: 10.5 kg/23.1 lbs.
Dimensions Length: 402 mm/15.83”, width: 268 mm/10.55”, height: 241 mm/9.49”
Dimensional drawings available at www.arri.com/alexa/downloads
Environmental -10° C to +45° C (+14° 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.
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. Custom formats (except for Open Gate sensor mode) are available for order through the online ground glass composer
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 (XR Capture Drive or SxS PRO card 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, electronic horizon, 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. 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.
In-camera Recording Uncompressed and unencrypted ARRIRAW, compressed and unencrypted QuickTime/ProRes or compressed and unencrypted MXF/DNxHD recording onto XR Capture Drives. With SxS Adapter: QuickTime/ProRes or MXF/DNxHD onto SxS PRO or SxS PRO+ cards. With CFast 2.0 Adapter: QuickTime/ProRes or MXF/DNxHD onto CFast 2.0 cards. All formats include embedded audio, timecode and metadata. ARRIRAW can additionally store an ASC Color Decision List (CDL) from an on-set network connection.

For more details, click here

Recording Outputs 2x 1.5G or 3G REC OUT BNC connectors for uncompressed 1920 x 1080 4:4:4 RGB or 4:2:2 YCbCr HD video at 23.976, 24, 25, 29.97, 30, 50, 59.94, or 60 fps. Recording other speeds requires a recorder with Variflag support. Legal or extended range signal mapping. Embedded audio, time code, metadata and recording flag. ALEXA XT models do not offer ARRIRAW T-Link output.

For a detailed table of REC OUT options click here
For a detailed table of ‘REC OUT = Clean MON OUT’ behavior click here

Monitor Output 2x 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. Embedded audio, time code, metadata and recording flag.
Image Processing 16 bit linear internal image processing in full ALEXA native color space. Target output color spaces for ProRes, DNxHD, REC OUT and MON OUT: Log C or Rec 709. For Rec 709, a customized look can be applied during record and playback with ARRI Look Files. Optional horizontal image mirroring.
Synchronization Master/Slave mode for precision sync of settings, sensor, processing, HD-SDI outputs and QuickTime/ProRes or MXF/DNxHD recording for 3D applications. PHASE user button for synching camera phase to an external source, like a CRT monitor or rear screen projector (works in Rec Run TC mode, with mirror shutter on and off).
Playback Playback of ARRIRAW, ProRes or DNxHD from XR Capture Drive or playback of ProRes or DNxHD from SxS PRO or SxS PRO+ cards visible on EVF-1, MON OUT and REC OUT. Playback audio available over headphone jack and embedded in the MON OUT and REC 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, DNxHD (1) 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 for XR Capture Dive or SxS adapter
2x BNC recording out HD-SDI, 1.5G/3G (REC OUT 1 and REC OUT 2)
2x BNC monitoring out HD-SDI, 1.5G (MON OUT 1 and MON OUT 2)
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 designed for fast exchange without camera disassembly. These connectors require a special tool.
SD Card For importing and storing ARRI Look Files, camera set up files, frame line files, feature license keys, user pixel masks and custom lens tables for the Lens Data Archive (LDA). Stores captured stills from the REC OUT image path in TIFF (.tif, 16 bit), DPX (.dpx, 10 bit) or JPEG (.jpg, 8 bit) format (1). 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 can be exchanged for future control electronics. Exchangeable Lens Mount (ELM) allows other lenses beyond PL mount lenses to be used. Simple camera software updates via free of charge Software Update Packets (SUPs) and payable license keys – Anamorphic De-squeeze (included), High Speed (included) and DNxHD (included).
Software Tools (apps) ARRIRAW Converter (ARC)
ARRI Look Creator (ALC)
ARRI Meta Extract
Software Tools (online) ALEXA Camera Simulator
ALEXA Frame Line Composer (AFC) 
LUT Generator 
ALEXA Pocket Guide WebApp 
(1) Frame grabs are not possible during High Speed, 16:9 2K, 4:3 2K, Open Gate or when the option “REC OUT = MON OUT Clone” is chosen.
Note: Technical data based on Software Update Packet SUP 10.0.1 (ALEXA XT/XR).
All data subject to change without notice.