6728 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAA OPTAHM3AWA NO CTAHAAPTW3ALWMORGANISATION INTERNATIONALE DE NORMALISATION Photography - Camera lenses - Determination of sO colour contribution index (lSO/CCl) Photographie-Objectifs photographiques-Determinationde I'indiceiso de contributiona la couleurdes images (iso/ccl) First edition - 1983-07-01 )672B-1983(E) UDC 771.351:681.7.013 Ref.No.1SO6728-1983(E) Descriptors : photography, cameras, photographic lenses, determination, coloursensitivity CopyrightInternational Organization for Standardization Noreproductionor networking permited withoutlicensefrom IHS Not for Resale, 12/17/2015 06:25:16 MST INTERNATIONAL STANDARD ISO6728-1983 (E) Photography - Camera lenses s - Determination of IsO colour contribution index (lSO/CCl) 0 Introduction values obtained through the use of this International Standard cannot be compared to those obtained with other methods The overall colour balance of a photographic film camera image prior to 1980. The use of the notation 0/5/4 rather than 5-0-1 depends on the spectral characteristics of the film/process combination,the illuminant,and the optical system.These national Standard. three elements are made by a large number of manufacturers throughouttheworld,butareexpectedtoworkinter- The annexes provide additional information on this subject. eitherintheformoftransparenciesorprints.Forthisreason commonstandardsoraimshavetobeestablishedforproducts 1 Scope and field of application and variability has to be tightly controlled. This International Standard describes a method for determining This International Standard is concerned with the optical com- and specifiying the contribution of camera lenses to the colour ponent of the photographic system which, in most cases, is the of a photograph. The procedure can also be applied to other lens. It describes the spectral characteristics of an IsO standard optical elements in the camera. camera lens and a method for determining the contribution of spectrally selective lenses to the colour of the final camera film image. The method is based on the assumption that the film 2 References will have the spectral sensitivity of an average colour film and be exposed to "photographic daylight" illumination. Spectral Iso 5/1, Photography -Density measurements -- Part 1: transmittance values of an Iso standard camera lens are sug- Terms,symbols andnotationsforreflectionandtransmission gested aims for lens manufacturers. density. 1) Previous to this International Standard, the colour contribution ISO2 2239, Photography Light sources for use in sen- of lenses was determined using the procedure based on den- sitometricexposure-Simulationofthespectraldistributionof sity, while the procedure in this International Standard is based daylight. on log transmittance. This International Standard also updates the average spectral sensitivity values for the latest colour films. ISo 3028, Photography-Camera flash-Determinationof For the above reasons, the colour contribution indcx (CCl) ISO spectral distribution index.2) 1 At present at the stage of draft. 2) At present at the stage of draft (Revision of ISO 3028-1974.) mational Organizatio n for Standardizatior Noreproductionor networking permited without license from IHS ded by IHS t Not for Resale, 12/17/2015 06:25:16 MST ISO6728-1983(E) ClEPublicationNo.15(E-1.3.1),Colorimetry,OfficialRecom considered in evaluating its colour contribution to the photo- mendations of the International Commission on llumination. graphic result. This International Standard has been developed on the assumption that the lens is the only element in the optical system, since this is the case for most types of cameras. If additional elements are used, the combined spectral effect of Definitions all components has to be considered. 3 The spectral transmittance of the lens over the wavelength in- 3.1 photographic response: The effective response of a terval to