6516 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAR OPrAHW3ALWR HO CTAHAAPTW3ALMW+ORGANISATION INTE RNATIONALE DE NORMALISATION Photography - Photographic lenses - Distance scale markings Photographie -- Objectifs photographiques -- Marquage de I'échelle des distances de mise au point First edition -- 1980-05-01 UDC 771.351 : 77.022.8 Ref. No. ISO 6516-1980 (E) 6516-1980 (E) Descriptors : photography, photographic equipment, optical equipment, photographic lenses, marking, distance, measuring scales. SO Price based on 1 page CopyrihtInematinalOrganizationforStandardization ed without license from IHS Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso member bodies). The work of developing Inter- national 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 6516 was developed by Technical Committee ISO/TC 42, Photography, and was circulated to the member bodies in May 1979. It has been approved by the member bodies of the following countries : Australia Italy Switzerland United Kingdom Belgium Japan Canada Korea, Rep. of USA Czechoslovakia Libyan Arab Jamahiriya USSR France Poland Germany, F. R. Spain No member body expressed disapproval of the document. International Organization for Standardization,1980 Printed in Switzerland Copyright International Organization for Standardization from IHS Not for Resale INTERNATIONAL STANDARD ISO 6516-1980 (E) Photography - Photographic lenses Distance scale markings Scope.and field of application 1 reference plane other than that of the sensitized material is used to determine the object distance, or if an index mark coincident with the This International Standard specifies a series of preferred sensitized material may cause errors or not be feasible. :values for the distance scale markings of photographic lenses. 2 No index mark is required on a camera whose lens has only rough scales. 2 Distance scales The distance scales shall indicate the object distance measured Distance scale markings from the plane of registration of the sensitized material in the 4 camera to which the lens is fitted. 4.1 The following is a series of preferred values for scales NOTE - An alternative reference plane may be 'chosen where the indicating distance in metres : above may cause errors or not be feasible. This includes for example, a camera which has an optical path which is folded between the lens and 500 - 200 — 100 - 70 50 - 30 20 - 15 - 12 - 10 - the sensitized material. 1,5 - 1,3 - 1,2 - 1,1 - 1 - 0,9 - 0,8 - 0,7 - 0,6 - 0,55 - 0,5 - 0,45 - 0,4 - 0,35 - 0,3 - 0,27 - 0,25. 3 Index mark 4.2 The following is a series of preferred values for scales When an index mark is used for indicating the plane of the sen- indicating distance in feet1) : sitized material, it shall consist of a circle crossed by a line having a length of between two and three times the diameter of the circle, as shown below. The orientation of the line crossing 1 500 - 700 - 300 - 200 — 150 - 100 - 70 - 50 40 - 30 25 - 20 - 15 12 - 10 - 8 - 7 - 6 - 5 - 4.5 - 4 - 3.5 - 3 - 2.75 - 2.5 - 2.25 - 2 - 1.75 - 1.5 sitized material. 1.25 1 -- 0.75 - 0.5. 4.3 Infinity shall be indicated by the mathematical mark co. 4.4Distance scales in metres shall be designated by "m" and NOTES those in feet shall be designated by "ft". These designations 1 The index mark prescribed above should not be used when a shall be placed at the same end of the