sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system introduced in 1974. A closely
they are not yet published standards. DIN ISO 53438 List of EN standards List of IEC standards List of ISO standards DK 621.882.245 Deutsche Normen Dec
Press/Elsevier. p. 75. ISBN 978-0-240-80998-4. Jacobson 2000, pp. 306–309. "Basic Sensitometry and Characteristics of Film" (PDF). Kodak Cinema and Television: Technical