Footnote
a ISO is the abbreviation for International Standards Organization; ASA, for American Standards Association. In parts of Europe, DIN (Deutsche Industrie Norm) is also used. A film listed as ISO 100/21 is ASA 100, or 21 DIN.
a ISO is the abbreviation for International Standards Organization; ASA, for American Standards Association. In parts of Europe, DIN (Deutsche Industrie Norm) is also used. A film listed as ISO 100/21 is ASA 100, or 21 DIN.