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
ThunderCatsRead more in this article about some frequently asked questions and fun facts related to our definitions.
What Does “Wag the Dog” Mean?If you aren't immersed in politics on the daily, through social media, the news, or just casual conversation, you might not be aware that the phrase wag the dog has become pretty poignant political jargon. But, how did it end up in the political lexicon and where did this seemingly innocent-sounding idiom come from?
Word Origin for ISO rating
C20: from I nternational S tandards O rganization
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012