ISO INTERNATIONAL STANDARD 19012-1 Third edition 2013-05-15 Microscopes - Designation of microscope objectives - Part 1: Flatness of field/Plan Microscopes - Désignation des objectifs de microscope - Partie 1: Planéité du champ/Plan Reference number ISO 19012-1:2013(E) ISO @ IS0 2013 IS0 19012-1:2013(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2013 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 the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax+41227490947 E-mail copyright@iso.org Web www.iso.org Published in Switzerland .ii IsO2013-All rights reserved IS0 19012-1:2013(E) Contents Page Foreword ..iv 1 Scope. .1 2 Normative references ..1 3 Terms and definitions ..1 4 Requirements. 4.1 Indication. .2 4.2 Definition of plan objectives. ..2 4.3 Determination of plan field number ..2 Annex A (informative) Depth of field in object space calculated by Berek's formula .4 Bibliography 7 .sn.2013..l rightsreserved ii