ARRI Alexa

Short Definition

The ARRI Alexa camera system is a digital cinema camera system introduced in 2010, distinguished by its 6.5-megapixel ALEV III sensor and excellent color science. It has become the industry standard for high-end film productions.

Technical Specifications

Sensor:

• Sensor size: 23.8 × 12.7 mm (Alexa Mini) or 27.65 × 14.67 mm (Alexa XT)
• Resolution: 3,880 × 2,160 pixels (6.5 megapixels)
• Pixel size: 6.9 μm
• Dynamic range: ~14+ stops
• Color space: ACES (Academy Color Encoding System)

Recording:

• Format: ProRes 4444, ProRes 422 HQ, Uncompressed (optional)
• Bitrate: up to 1.6 Gbps
• Storage medium: SxS Pro+ or XQD cards
• Frame rate: 1–40 fps standard (up to 80 fps possible)

Optics:

• Mount: PL-Mount (EF-Mount for ELF variant)
• Sensor filter: IRND filter (internal)
• Shutter: 172.8° electronically adjustable

Operation:

• Power consumption: approx. 90 W
• Weight: 4.5 kg (body)
• Operating temperature: 0–45°C

Development and History

The ARRI Alexa was developed by Arnold & Richter Cine Technik and introduced at NAB in 2010. It marked a turning point in the acceptance of digital cinematography in Hollywood. Unlike other digital cameras of that era, ARRI placed particular emphasis on:

• Natural Color Science: The sensor was specifically designed for film-like color reproduction
• Log Curve Characteristics: ARRIRAW and ProRes with optimized gamma curve for post-production
• Robustness: Professional build quality for long-term use

Model Development:

• Alexa (2010): Original model with ALEV III sensor
• Alexa M (2012): Mechanically simplified version
• Alexa XT (2013): Larger sensor (4:3 aspect ratio)
• Alexa Classic (2015): Improved electromechanical shutter system
• Alexa Mini (2015): More compact version, 5.8 kg
• Alexa Mini LF (2018): Large Format sensor (36 × 24 mm)
• Alexa 65 (2017): 65mm equivalent, 6K resolution

The Alexa Mini LF and Alexa 65 expanded the family towards large format and 6K capabilities.

Notable Films and Productions

Feature Films:

• Gravity (2013, Cinematography: Emmanuel Lubezki) – Use of cult camera
• Dallas Buyers Club (2013) – ALEXA for narrative flexibility
• Interstellar (2014) – Alexa XT/65 combination
• Ex Machina (2014) – Independent Cinema
• Sicario (2015, Cinematography: Roger Deakins) – Crime Thriller
• The Revenant (2015, Cinematography: Emmanuel Lubezki) – Nature shots
• Nightcrawler (2014) – Low-light performance
• Phantom Thread (2017) – Period Drama
• First Man (2018, Cinematography: Hoyte van Hoytema) – Space film

Television/Streaming:

• Game of Thrones (2011–2019) – HBO standard
• The Mandalorian (2019–present) – Disney+
• Westworld (2016–2022) – Premium TV

Industry Professional Perspectives

Director of Photography

The ARRI Alexa is the backbone of modern cinematography:

"The Alexa revolutionized how we shoot digitally. The sensor has natural colors without artificial processing. For me, skin tone reproduction is crucial – the Alexa retains nuances that are lost on other cameras. The logarithmic curve gives me maximum control in grading. With the Mini LF, I finally have full-frame-like optical characteristics in a portable camera."

Technical Advantages:

• Consistent color science across all models
• ARRIRAW workflow for maximum post-production control
• Low light pollution due to optimized architecture
• Long battery life (approx. 4–5 hours)

Director

Creative freedom and reliability:

"As a director, I need a camera I can rely on. The Alexa just keeps going. I trust the operators to get the technical aspects right, and I can focus on the performance. That's professionalism."

Director's Perspective:

• Reliable technology reduces dependencies
• Alexa workflow is established, major service providers and rentals available
• Qualitatively consistent over long productions
• VFX-friendly color pipeline

Editor

Offline workflow and grading compatibility:

"ProRes from the Alexa is the offline standard. I work quickly and efficiently with proxy files. In grading, ProRes 4444 has enough headroom for generous color corrections. The ALEXA Log makes grading intuitive."

Editorial Efficiency:

• ProRes family optimized for editing software (Avid, Premiere, FCP)
• Proxy management is established
• Color science supports DCI and broadcast standards
• Long-term viability through standardized codec family

Producer

Economic reality and financial security:

"ARRI is the standard. Every production company has Alexa cameras, memory cards, and in-house expertise. The risk is minimal. Financiers expect Alexa technology, and broadcaster standards fully support ProRes. That's business security."

Economic Advantages:

• Wide equipment availability reduces logistical costs
• Established rental price structure
• Technical expertise in every major production house
• High resale value, depreciation is calculable
• Broadcast/streaming compatibility is automatic

Related Terms

• ALEV III Sensor – Specific sensor type with Linear Full-Well Capacity
• ARRIRAW – Uncompressed raw format (optional)
• ProRes 4444 – Codec with alpha channel, 12-bit color depth
• Log Curve – Logarithmic gamma characteristic
• PL-Mount – Lens mount standard
• ACES – Academy Color Encoding System
• DCI Compliance – Digital Cinema Initiatives standard
• Color Grading – Color correction in post-production
• Large Format (LF) – Sensor family for larger image area
• Light Flicker Elimination (LFE) – Anti-flicker technology

Status: 2024 | Valid for: ARRI Alexa Classic to Alexa 65