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1、INTERNATIONAL STANDARD IS0 5800:1987 TECHNICAL CORRIGENDUM 1 Published 2001 -06-1 5 I INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXQYHAPOnHAR OPrAHM3MFI no CTWWPTM3A4MH ORGANISATION INTERNATIONALE DE NORMALISATION I Photography - Colour negative films for still photography - Determination of IS
2、0 speed TECHNICAL CORRIGENDUM 1 Photographie - Films ngatifs couleur pour prise de vue - Dtermination de la sensibilit IS0 RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to International Standard IS0 5800:1987 was prepared by Technical Committee ISO/TC 42, Photography. Page 3 Subclause 5.5 Delete
3、the text beginning with “These conditions are designated:“ and ending with “at least 1 mm from the edges of the exposures.“ and replace it with the following text: “Readings shall be made in a uniform area of the image, typically at least 1 mm from the edges of the exposures.“ ICs 37.040.20 Ref. No.
4、 IS0 5800:1987/Cor.l:2001 (E) O IS0 2001 -All rights reserved Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 20:46:54 MDTNo reproduction or networking per
5、mitted without license from IHS -,-,- 5800-87 I4t353703 0042737 I c fL 35-4 INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPTAHM3AlJMR IO CTAHAAPTM3AlJMM Photography - Colour negative films for still photography - Det
6、ermination of IS0 speed Photographie - Films ngatifs couleur pour prise de vue - Dtermination de la sensibilit IS0 IS0 5800 Second edition 1987-1 1-15 Reference number IS0 5800 : 1987 (E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Te
7、chnical Standards 1/9972545001 Not for Resale, 04/26/2007 20:46:54 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 Foreword I IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of p
8、reparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental
9、, 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 IS0 Council. They are approved in accordance with IS0 procedures requiring a
10、t least 75 % approval by the member bodies voting. International Standard IS0 5800 was prepared by Technical Committee ISO/TC 42, Photography. This second edition cancels and replaces the first edition (IS0 5800 : 19791, of which it constitutes a technical revision. Users should note that all Intern
11、ational Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. O International Organization for Standardization, 1987 Printed in Switzerland Copyright International Organization for Stan
12、dardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 20:46:54 MDTNo reproduction or networking permitted without license from IHS -,-,- 5800-87 4 4853703 oo42q37 r INTERNATIONAL STANDARD IS0 5800 : 1987 (E) Photography - Colour
13、negative films for still photography - Determination of IS0 speed O Introduction Satisfactory prints can generally be obtained from colour negative films over a significant range of exposure provided that suitable adjustments are made in the printing operation. The underexposure latitude is approxim
14、ately one camera ex- posure value unit (camera stop or E,) when film speed is deter- mined using this International Standard. Overexposure latitude of a colour negative film can be as large as 3E,. In other words, if a colour negative film has a speed of IS0 100, it may give satisfactory results if
15、it is exposed anywhere from IS0 12 to IS0 200. Photographers, on the average, tend to underexpose film, par- ticularly in simple cameras,) as a result of their desire to record events under cloudy conditions or in the shade. Some camera- cartridge systems are designed to take advantage of the overex
16、posure latitude of colour negative films to improve results when pictures are taken under these circumstances. This is accomplished by overexposing the film under sunlight conditions to increase the underexposure latitude of the system. For example, a 126-size cartridge containing film with ah IS0 s
17、peed of 100 may be coded for IS0 4 speed. This International Standard is a revision of IS0 5800 : 1979 to update the format of presentation and to reference new IS0 standards which more precisely describe illuminants and den- sitometry specified for use. No differences in speed values should result
18、from the changes made to the International Stan- dard. i Scope and field of application This International Standard specifies the method for determin- ing the IS0 speed of colour negative camera films for pictorial still photography. It is assumed that the colour negatives obtained with these fims w
19、ill be used to make reflection-type colour prints primarily but may also be used to make colour transparencies. The speeds obtained by application of this International Standard are intended for practical use with exposure meters, exposure calculators, and exposure tables. This International Standar
20、d does not apply to colour negative films for motion-picture and aerial photography or for making intermediate negatives. 2 References IS0 5, Photography - Density measurements - Part 1: Terms, symbols and notations. Part 2: Geometric conditions for transmission density. Part 3: Spectral conditions.
21、 IS0 554, Standard atmospheres for conditioning and/or testing - Specifications. IS0 2720, Photography - General purpose photographic exposure meters (photoelectric type) - Guide to product specification. IS0 2721, Photography - Cameras - Automatic controls of exposure. IS0 7589, Photography - Illur
22、ninants for sensitometry - Specifications for daylight and incandescent tungsten. 3 Definitions For the purpose of this International Standard, the following definitions apply. 3.1 speed: A quantitative measure of the response of the photographic material to luminous energy for the specified con- di
23、tions of exposure, processing, density measurement, and analysis. 3.2 exposure (HI: The time integral of illuminance on the film, measured in lux seconds, and designated by the symbol H. Exposure is often expressed in loglo H units. 3.3 exposure value unit: A unit used for an exposure change by a fa
24、ctor of 2 or change of 0,30 loglo H units. To be in compliance with IS0 2720, this will be denoted as 1 E,. Changing exposure may be accomplished by changing exposure time, illumination level, or filters over the lens. 1) Such as those with one shutter speed and two aperture stops. 1 Copyright Inter
25、national Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 20:46:54 MDTNo reproduction or networking permitted without license from IHS -,-,- - _-_ 5800-87 1 4 8 5 3 9 0 3 0042920 II IS0 5800 : 1987 (E) 4
26、 Sampling and storage In determining the IS0 speed of a product, it is important that the samples evaluated yield the average results obtained by users, This will require evaluating several different batches periodically under the conditions specified in this International Standard. Prior to evaluat
27、ion, the samples shall be stored ac- cording to the manufacturers recommendations for a length of time to simulate the average age at which the product is nor- mally used. Several independent evaluations shall be made to ensure correct calibration of equipment and processes involved in determining f
28、ilm speed. The basic objective in selecting and storing samples as described above is to ensure that film characteristics are representative of those obtained by a photographer at the time of use. 5 Method of test 5.1 Principle Samples are exposed and processed as specified below. Den- sity measurem
29、ents are obtained from the resultant images to produce a sensitometric curve from which values are taken and used to determine IS0 speed. 5.2 Safelights To eliminate the possibility of safelight illumination affecting the sensitometric results, all films shall be handled in complete darkness to avoi
30、d exposing the emulsion to unintentional radi- ation during sample preparation, exposing and processing. 5.3 Exposure 5.3.1 Sample condition During exposure, the samples shall be at a temperature of 23 f 2 O C and in equilibrium with a relative humidity of (50 rt 5) %. 5.3.2 Type of sensitometer The
31、 sensitometer shall be a non-intermittent, illuminance-scale type. 5.3.3 Radiant energy quality The appropriate illuminant for the particular film type being ex- posed shall conform to the specification given in IS0 7589. IS0 speed may be determined using IS0 sensitometric daylight, studio tungsten,
32、 or photoflood illuminants. Since the speed of film/process combinations will depend on the type of illumi- nant used for determining IS0 speed, the illuminant should be specified in the instructions. 5.3.3.1 Filters IS0 speed shall be specified for use without a filter in front of the camera lens.
33、If film is used with a colour filter in front of the camera lens, an “equivalent“ speed number can be used to determine the exposure of the film with the filter. IS0 speed does not apply to the filtered condition. 5.3.4 Modulation The total range of spectral diffuse transmission density with respect
34、 to the film plane of each area of the light modulator throughout the wavelength interval from 400 to 700 nm shall not exceed 5 % of the average density obtained over the same interval or 0,03 density, whichever is greater. In the interval from 360 to 400 nm, 10 % of this same average density, or 0,
35、M density, whichever is greater, is acceptable. If stepped increments are used, the logarithm to the base 10 of the exposure increment shall not be greater than 0,20. The width and length of a single step shall be adequate to obtain a uniform density within the reading aperture specified for densito
36、metry. If a continuous variable modulator is used, the logarithm to the base 10 of the change in exposure with distance along the test strip shall be uniform and not greater than 0,04 per millimetre. 5.3.5 Exposure time The exposure time shall correspond with the usage practice for the particular fi
37、lm tested. Since the speed of film may be dependent on the exposure time because of reciprocity law failure, the exposure time used for determining the IS0 speed should be specified when quoting values. 5.4 Processing . 5.4.1 Conditioning of samples In the time interval between exposure and processi
38、ng, the samples shall be kept at 23 f 2 O C and a relative humidity of (50 f 5) %. The processing shall be completed in not less than 5 days and not more than 10 days after exposure for general- purpose films, and not less than 4 h and not more than 7 days for professional films. 5.4.2 Processing sp
39、ecifications No processing specifications are described in this International Standard in recognition of the wide range of chemicals and equipment used. IS0 speeds provided by film manufacturers generally apply to the films when they are processed in ac- cordance with their recommendations to produc
40、e the photographic characteristics specified for the process. Process information shall be available from film manufacturers or others who quote IS0 speed. This shall specify the chemicals, time, temperature, agitation equipment, and procedure used for each of the processing steps and any additional
41、 information required to obtain the sensitometric results described. The values for speed obtained using various processing pro- cedures may differ significantly. Although different speeds for a particular film may be achieved by varying the process, other sensitometric and physical changes may also
42、 accompany the speed changes. 5.5 Densitometry IS0 standard Status M diffuse transmission densities of the processed images shall be measured using a densitometer com- plying with the geometric conditions specified in IS0 5-2 and the spectral conditions specified in IS0 5-3. 2 Copyright Internationa
43、l Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 20:46:54 MDTNo reproduction or networking permitted without license from IHS -,-,- These conditions are designated: DT(90 opal; SH: I O ; MI 5800-87 ,48
44、53903 0042921 3 IS0 5800 : 1987 (E) 5.6 Evaluation 5.6.1 Sensitometric cume or D T ( IOo; SH: 9 0 opal; M). A minimum aperture area of 7 mm2 should be used to minimize the effect of image non-uniformity. Readings shall be at least 1 mm from the edges of the exposures. The IS0 standard red, green, an
45、d blue Status M diffuse transmission density values are plotted against the logarithm to the base 10 of the corresponding exposure (H) expressed in lux seconds, to obtain three sensitometric curves similar to those il- lustrated in the figure. loglo N (H in lux seconds) In the figure above, the red
46、is the slowest and the formula becomes: Figure - Method for determining speed 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 20:46:54 MDTNo reproduction or networking permitte
47、d without license from IHS -,-,- - _ - 5800-87 Y 8 5 L O 3 0042922 5 IS0 5800 : 1987 (E) 56.2 Minimum densities The red, green, and blue minimum densities shall be deter- mined from an unexposed sample of the same film processed simultaneously with the film exposed for determining the sen- sitometri
48、c curve. 5.6.3 Determination of H, Speed is calculated from the exposures required to produce red, green, and blue densities that are 0,15 above the cor- responding minimum density values for each of the three curves. The exposure, H, is computed by the use of the formula : Hm = dHGreen HSlowest lay
49、er The exposure, H, represents the sensitometric parameter from which speed is computed. If the green layer is also the slowest, H, will equal H G . 6 Product classification 6.1 IS0 speed scale The speed scales given in the table are derived from the for- mulae: Arithmetic speed: S = - Hm Logarithmic speed: So =