Measurement of a camera's tonal range from darkest to brightest recordable detail.
Technical Details
Dynamic range is measured as a logarithmic ratio between the brightest and darkest recordable signal. For example, an ARRI Alexa 35 achieves over 17 stops, while the RED V-Raptor reaches 16.5+ stops. Each additional stop doubles the recordable brightness span: 10 stops correspond to a contrast ratio of 1:1024, and 14 stops reach 1:16,384. Usable dynamic range is typically 1-2 stops below the theoretical maximum, as noise floor and clipping define the practical limits.
History & Development
Kodak's Vision3 250D film established the analog standard in 2007 with 13+ stops. The digital revolution began in 2010 with the ARRI Alexa (13.3 stops), followed by RED's Dragon sensor (16.5+ stops) in 2013. Sony's Venice first achieved over 15 usable stops in 2017. The latest generation, with the ARRI Alexa 35 (2022) and RED V-Raptor (2021), broke the 17-stop barrier through improved sensor architectures and Dual-ISO technologies.
Practical Application in Film
Roger Deakins utilized the ARRI Alexa's 14 stops in "Blade Runner 2049" for extreme contrast scenes between neon light and deep shadows without additional lighting. Emmanuel Lubezki shot "The Revenant" with natural light, where the high dynamic range enabled snow-sky contrasts without overexposure. HDR workflows require at least 12 stops for PQ encoding (Dolby Vision). With lower dynamic range, cinematographers must compensate with graduated ND filters or bracketing.
Comparison & Alternatives
The human eye simultaneously captures approximately 10-14 stops but can adapt to 20+ stops through adaptation. Standard monitors (Rec. 709) display only 6-7 stops, while HDR displays reach 10-12 stops. Log recording (S-Log3, V-Log) utilizes the full sensor range, whereas standard gammas limit it to 6-8 stops. Tone mapping compresses high dynamic range for standard displays, while HDR mastering preserves the original light information until final playback.