ISO rating

noun

1. photog a classification of film speed in which a doubling of the ISO number represents a doubling in sensitivity; for example, ISO 400 film requires half the exposure of ISO 200 under the same conditions. The system uses identical numbers to the obsolete ASA rating

Word History and Origins

Origin of ISO rating¹

C20: from I nternational S tandards O rganization

Example Sentences

Additionally, I am not bringing enough flash power to accommodate such a low ISO rating.

From Los Angeles Times

But of all its impressive stats, the one most amateur photographers will probably value is its maximum native ISO rating—a measure of how well the camera can shoot in dark environments without sacrificing image quality.

From Wall Street Journal

DFD has a current ISO rating of 4 within the Duncan City Limits.

From Washington Times

While the 20.7-megapixel sensor appears unchanged, Sony’s raised its max ISO rating to an impressive 12,800 — the first among smartphones to reach that value.

From The Verge

Most cameras have a top ISO rating of at least 800, which is fine for normal indoor and outdoor use.

From Time