ISO INTERNATIONAL STANDARD 516 Fourth edition 2019-04 Camera shutters Timing General definition and mechanical shutter measurements Obturateurs d'appareils photographiques - Durée d'exposition - Définition générale et mesurages d'obturateur meécanique Reference number IS0 516:2019(E) so @ IS0 2019 IS0 516:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 516:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Symbols ..4 5 Required characteristics and their tolerances .5 5.1 Exposure time.. .5 5.1.1 Exposure time marking .6 5.1.2 Tolerances. ..6 5.2 Delaytime. .. 6 5.2.1 Front shutters. .6 5.2.2 Focal-plane shutters .8 6 Test methods. .9 6.1 General 9 6.2 Apparatus .9 6.2.1 Apparatus. 9 6.2.2 Detector .9 6.2.3 Time-interval meter .10 6.3 Front-shutter test .10 6.3.1 Test assembly 10 6.3.2 Procedure.... .10 6.4 Focal-plane-shutter test ..11 6.4.1 Test assembly ..11 6.4.2 Procedure. 7 Explanatory notes ..13 7.1 Tolerance. ..13 7.2 Test method .14 Annex A (normative) Graphic test methods. ..15 Bibliography .22 IS0 2019 - All rights reserved iii