ALEXA M Technical Data

Camera Type 35 format film-style digital camera with separate camera head and body.
Photosites 16:9 sensor mode:
2880 x 1620 for ARRIRAW, 2880 x 1620 down sampled to 1920 x 1080 for HD video, ProRes and DNxHD4:3 sensor mode:
2880 x 2160 for ARRIRAW, 2880 x 2160 down sampled to 1440 x 1080 (pillar box) for monitoring in EVF-1 and HD video (MON OUT only)
Operating Modes 16:9 or 4:3 sensor mode. 4:3 mode is currently only available for ARRIRAW. Regular (max. 60 fps) or High Speed mode (max. 120 fps).
Frame Rates 16:9 sensor mode:
ProRes 422 (Proxy), 422 (LT), 422 and 422 (HQ), DNxHD 145 and 220x: 0.75 – 120 fps; ProRes 4444: 0.75 – 60 fps; HD-SDI: 0.75 – 60 fps; ARRIRAW: 0.75 – 60 fps4:3 sensor mode:
ARRIRAW: 0.75 – 48 fps
Shutter Electronic rolling shutter, 0.75 – 60 fps: 5.0º – 358.0º, 60 – 120 fps: 356º. Shutter angle setting precision: 1/10 degree.
Exposure Latitude 14 stops for all sensitivity settings from EI 160 to EI 3200, as measured with the ARRI Dynamic Range Test Chart (DRTC)
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 and DCI P3 are the same except for 0.5 stops fewer in the low end at EI 160, 0.4 stops fewer in the low end at EI 200 and 0.2 stops fewer in the low end at EI 400.
White Balance Separate red/blue and green/magenta balance available through Auto White Balance or manual setting. Red/blue: 2000 to 11000 Kelvin, adjustable in 100 K steps, with presets of 3200 (tungsten), 4300 (fluorescent), 5600 (daylight), 7000 (daylight cool). Green/magenta: -8 to +8 color correction (CC), 1 CC = 035 Kodak CC values or 1/8 Rosco values.
Sound Level Under 20 db(A) @ 24 fps and ≤ +30° Celsius (≤ +86° Fahrenheit) with lens attached, measured 1 m/3 feet in front of the lens.
Power In Three inputs at the camera body: BAT connector, battery adapter back and battery adapter top. All accept 10.5 to 34 V DC. 85 W power draw for body in typical use recording to SxS PRO cards, without accessories. 40W power draw for head in typical use without accessories. A 24 V power input to the body is required to power the camera head from the body through a standard SMPTE 311M hybrid fiber cable up to 50 meters, without accessories. The camera head has one 10.5 to 34 V DC power input that can be used to power the head independently from the camera body.
Power Out Several outputs at the camera body: 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 = output voltage. Both RS and EXT connectors combined: up to 2.2 A. ETHERNET: up to 1.2 A. Maximum power draw is also limited by the power source. The camera head offers two RS connectors and one ETHERNET connector, with the same specifics as on the camera body.
Weight ALEXA camera body + SxS Module: 5.5 kg/12.1 lbs; ALEXA camera head: 2.9 kg/6.4 lbs
Dimensions Body: Length: 323mm, width: 153mm, height: 158mm; Head: Length: 212mm, width: 129mm, height: 149mm.
Dimensional drawings available at www.arri.com/alexa/downloads
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 on camera head and body.
Lens Mount ARRI Exchangeable Lens Mount (ELM); ships with Lens Adapter PL Mount with LDS contacts, 54 mm stainless steel PL mount, Super 35 centered.
Flange Focal Depth 52.00 mm nominal
Viewfinder (optional) 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 pixel to pixel magnification), EXP button (false color exposure check) and jog wheel.
Assistive Displays For EVF-1 and MON OUT: frame lines, surround view, camera status, false color exposure check, peaking focus check, compare stored image with live image, RETURN IN video and anamorphic de-squeeze. MON OUT only: Reel & clip number.
Control Camera body right: main user interface with 3” transflective 400 x 240 pixel LCD color screen, illuminated buttons, button lock and jog wheel. Camera head back: REC button and POWER button (POWER button is active when head is run by local power supply through the head’s BAT input).
In-camera Recording Records Apple QuickTime files with ProRes encoding or MXF files with DNxHD encoding onto either one or two (Dual Recording) SxS PRO cards. All codecs legal range with embedded audio, timecode and metadata.
Recording Outputs 2x 1.5 G or 3G REC OUT BNC connectors on the camera body for ARRIRAW T-Link or HD-SDI video. Both with embedded audio, timecode, metadata and optional recording flag.
ARRIRAW 2880 x 1620 (16:9), 2880 x 2160 (4:3) uncompressed 12 bit log without white balance or exposure index processing applied. Requires an ARRIRAW T-Link certified recorder.
HD-SDI video: uncompressed 1920 x 1080 (16:9) 4:4:4 RGB or 4:2:2 YCbCr; both legal or extended range. Recording frame rates other than HD standard (23.976, 24, 25, 29.97, 30, 50, 59.94, 60 fps) requires a recorder with Variflag support.
Monitor Output 1x MON OUT BNC connector on the camera body for uncompressed 1.5G HD-SDI video: 1920 x 1080 (16:9), 4:2:2 YCbCr legal range.
Image Processing 16 bit linear internal image processing. Target color spaces for all ProRes codecs, DNxHD 220x, REC OUT and MON OUT: Log C (film matrix off), Log C (film matrix on), Rec 709 or DCI P3. Target color spaces for DNxHD 145: Rec 709 or DCI P3. For Rec 709 and DCI P3 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.
Playback QuickTime/ProRes or MXF/DNxHD clips can be played back from SxS PRO cards to the EVF-1, MON OUT and REC OUT. Playback audio is available embedded in the MON OUT and REC OUT signals and on the headphones jack.
Audio 1x XLR 5 pin AUDIO IN connector for 2 channel, line level balanced audio input, 24 bit/48 kHz A/D conversion, works at 23.976, 24, 25, 29.97 and 30 fps. Audio is recorded uncompressed into the QuickTime/ProRes or MXF/DNxHD files and embedded uncompressed in all HD-SDI outputs, including ARRIRAW T-Link. Max of 2.5 dBm output from AUDIO OUT headphones connector.
Connectors Slots for SxS PRO cards (SxS), Camera body
2x BNC recording out HD-SDI, 1.5G/3G (REC-OUT 1/2), Camera body
1x BNC monitoring out HD-SDI, 1.5G (MON OUT), Camera body
1x XLR 5 pin audio in (AUDIO IN), Camera body
1x BNC return signal HD-SDI, 1.5G (RET/SYNC IN), Camera body
1x LEMO 16 pin external accessories (EXT), Camera body
1x Fischer 2 pin 24 V power in (BAT), Camera body
2x Fischer 3 pin 24 V remote start and accessory power out (RS), Camera body
1x LEMO 2 pin 12 V accessory power out (12 V), Camera body
1x LEMO 5 pin timecode in/out (TC), Camera body
1x TRS 3.5 mm headphone mini stereo jack out (AUDIO OUT), Camera body
2x LEMO 10 pin Ethernet with 24 V power (ETHERNET), Camera body
1x LEMO SMPTE 304M hybrid fiber connector (Optical Link), Camera body
1x LEMO SMPTE 304M hybrid fiber connector (Optical Link), Camera head
1x LEMO custom 16 pin electronic viewfinder (EVF), Camera head
1x Fischer 2 pin 24 V power in (BAT), Camera head
2x Fischer 3 pin 24 V remote start and accessory power out (RS), Camera head
1x LEMO 10 pin Ethernet with 24 V power (ETHERNET), Camera head
SD Card For importing ARRI Look Files, camera set up files, frame line files and feature license keys. Stores captured stills from the REC OUT image path during Regular Speed (not High Speed) in ARRIRAW (.ari, 12 bit), TIFF (.tif, 16 bit), DPX (.dpx, 10 bit) and JPEG (.jpg, 8 bit) format as well as log files. Also used for software updates.
Upgrades The Storage Interface Module (currently available for SxS PRO cards) 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.