ISO INTERNATIONAL STANDARD 11421 First edition 1997-09-15 Optics and optical instruments -- Accuracy of optical transfer function (OTF) measurement Optique et instruments d'optique -- Exactitude du mesurage de la fonction detransfertoptique (OTF) This material is reproduced from Iso documents under International Organization for Standardization (Iso) Copyright License number IHS/ICC/1996. Not for resale. No part of these iso documents may be reproduced in any form,electronic retrieval system orotherwise,except as aliowed in the copyright lawof the country of use, or with the priorwritten consentofIso(Casepostale56,1211Geneva20,Switzerland,Fax+4122 7341079),JHsortheIsoLicensor'smembers. ISO Reference number ISO 11421:1997(E) Copyright Intermational Organization for Standardization No reproduction or networking permitted withoutlicense from IHS Not for Resale ISO 11421:1997(E) Contents Page 1 Scope 1 2 Normative reference 1 3 Definitions and symbols 1 4 Sources of inaccuracy in measuring equipment .. 3 5 Methods of assessing levels of accuracy.... 10 6 Calculation of overall accuracy of a measurement . 18 7 Specifying a general equipment accuracy . 19 8 Routine performance.evaluation ..... 22 Annexes 24 Accuracy of PTF measurement. B Determination of rate of change of MTF various parameters .... 25 C Example calculation of NAV 27 D Bibliography 30 @1ISO1997 All rights reserved.Unless otherwisespecified, no part ofthispubtication maybe reproduced or utilized in any fom or by any means, electronic or mechanical, including photocopying and microfilm, without permission in witing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; s=central Printed in Switzeriand No reproduction or networking perm Not for Resale @ ISO ISO 11421:1997(E) Foreword ISO (the International Organization for Standardization) is a world- wide federation of national standards bodies (lsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established 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. IsO collaborates closely with the International Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. circulated to the member bodies for voting. Publication se an International Standard requires approval by at least 75% of the member bodies casting a vote. Intenationai Standard ISO 11421 was sprepared by Technical CommitteeIsO/Tc 172,Optics and optical instruments,Subcommittee SC 1 Fundamental standards. Annex A forms an integral part of this International Standard. Annexes B, C and D are for information only. ili Copyright International Organization for Standardization mitted without license from IHS Not for Resale