ASA number

(from the article `motion-picture technology`) The overall sensitivity for picture taking has been increased greatly, from below about 10 ASA before 1930 to several hundred and even several ... ...is ISO speed, written, for example, 200/24°. The first half of this (200) is arithmetic with the value directly proportional to the sensi...
Found on http://www.britannica.com/eb/a-z/a/109
No exact match found