Based on earlier research work by Loyd Ancile Jones (1884–1954) of Kodak and inspired by the systems of Weston film speed ratings and General Electric film values, the American Standards Association (now named ANSI) defined a new method to determine and specify film speeds of black-and-white negative films in 1943. ASA Z38.2.1-1943 was revised in 1946 and 1947 before the standard grew into ASA PH2.5-1954. Originally, ASA values were frequently referred to as American standard speed numbers or ASA exposure-index numbers. (See also: Exposure Index (EI).) COUNT 5
QSN1 Who pioneered research that led to the new ANSI values? ANS1 Loyd Ancile Jones QSN2 What standards were the ANSI developed from? ANS2 Weston film speed ratings and General Electric film values QSN3 What types of film did the ANSI measure? ANS3 black-and-white negative films QSN4 When did the ANSI define its new measure? ANS4 1943 QSN5 What were ANSI values often called in the beginning? ANS5 American standard speed numbers or ASA exposure-index numbers