ISO INTERNATIONAL STANDARD 2721 Second edition 2013-03-01 Photography Film-based cameras Automatic controls of exposure Photographie - Appareils de prise de vues a film - Commandes automatiquesde l'exposition Reference number ISO 2721:2013(E) ISO @IS02013 No reproduction or networking permitted without license from IHS Not for Resale IS0 2721:2013(E) COPYRIGHTPROTECTEDDOCUMENT @IS02013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved or networking permited without license from IHS Not for Resale IS0 2721:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 4 Specific requirements .2 4.1 Scales .2 4.2 Out-of-range indication .2 4.3 The sensors of exposure controls .2 5 Calibration of the exposure controls .3 5.1 Method of calibration. .3 5.2 Light source for calibration. 3 5.3 General test conditions. .3 5.4 Exposure in the focal plane 4 Acceptance angles of the photoelectric system .4 6 6.1 Specific acceptance angle. 4 6.2 Oblique acceptance angles. 4 Annex A (normative) Measurement of light exposure in the focal plane and calibration of measuring instrument. ..5 Annex B (normative) Size of measuring area .8 Annex C (normative) Performance test ..9 Bibliography ..11 ii se with ISt without license from IHS Not for Resale