h2-0222 4851903 0013776.7 2720 NTERNATIONAL STANDARD .Tso F-15.05 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEKAYHAPOAHAA OPIAHW3ALIMH HO CTAHIAPTM3ALIMW.ORGANISATION INTERNATIONALE DE NORMALISATION Photography - General purpose photographic exposure meters (photoelectric type) -- Guide to product specification Photographie - Posemetres photographiques pour usage general (type photoelectrique) - Base de -spécification First edition - 1974-08-15 UDC 771.376.35 Ref. No. ISO 2720-1974 (E) Descriptors:photography,photographic equipment,photographic exposure meters,calibrating,testing conditions. Copyright Inte Price based on 7 pages 9 2L2ETO0 EO6T 2720-74 FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of national standards institutes (IsO Member Bodies). The work of developing International Standards is carried out through IsO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 2720 was drawn up by Technical ( Committee ISO/TC 42, Photography, and circulated to the Member Bodies in July 1972 It has been approved by the Member Bodies of the following countries : Germany Australia Spain Belgium Switzerland Italy Canada Japan Thailand Czechoslovakia Mexico United Kingdom Egypt, Arab Rep. of U.S.A. Romania France South Africa, Rep. of U.S.S.R. No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1974 PrintedinSwitzerland Copyright International Organization for Standardization No reproduction or networking permited without license from IHSs Not for Resale 48519030013778 0 h2-0222 CONTENTS Page 0 Introduction Scope and field of application 1 2 References 3 General requirements 4 Requirements for reflected light exposure meters 4 5 Requirements for incident light exposure meters 5 6 Nomenclature, calibration formulae and calibration constants 6 Copyright International Organization for Standardization ii reproduction or networking permitted without license from IHS Not for Resale