1、INTERNATIONAL STANDARD ISO 25 Second edition 1994-07-15 Cinematography - Camera usage of 16 mm motion-picture film - Specifications Cindma tographie - Emploi du film cinematographique 16 mm dans Ia Camera - Spkifica tions Reference number ISO 25:1994(E) ISO 25:1994(E) Foreword ISO (the International
2、 Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been est
3、ablished 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 (IEC) on all matters sf electrotechnical standardiz
4、ation. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 25 was prepared by Technical Committee
5、lSO/TC 36, Cinematography. This second edition cancels and replaces the first edition (ISO 253 976), of which it constitutes a technical revision. 0 ISO 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electr
6、onie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organkation for Standardkation Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland INTERNATIONAL STANDARD 0 ISO ISO 25:1994(E) Cinematography - Camera usage
7、 of 16 mm motion-picture film - Specifications 1 Scope This International Standard specifies the Position of the emulsion, the frame rate of exposure, and the orientation of the emulsion area being exposed for 16 mm silent and Sound motion-picture film perfor- ated along one or both edges. 2 Normati
8、ve references The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this Intern
9、ational Standard are encouraged to investigate the possibility of applying the most re- cent editions of the Standards indicated below. Members of IEC and ISO maintain registers of cur- rently valid International Standards. ISO 26: 1993, Cinematography - Projector usage of 16 mm motion-picture films
10、 for direct front projection - Specifica tions. ISO 69: 1990, Cinematography - 16 mm motion- picture and magnetic film - Cutting and perforating dimensions. ISO 466: 1976, Cinematography - Image produced by 16 mm motion-picture Camera aperture - Position and dimensions. 3 Specifications 3.1 The fram
11、e rate of exposure for film containing a Sound record or to be used in conjunction with a Sound record shall be 24 frames per second for both photographic and magnetic Sound. NOTE 1 A frame rate of exposure of 18 frames per sec- ond may still be found, especially for films without a Sound record. 3.
12、2 The frame rate of exposure for film not used for Sound shall normally be 24 frames per second, de- pending upon its intended use. NOTE 2 Special “no Sound” films may be photographed at any rate from time lapse to high Speed; the intended frame rate for projection should be noted. 3.3 Films intende
13、d only for television use may be run at a Camera Speed of 25 or 30 frames per second, depending on the television System in use. NOTE 3 A frame rate of 25 frames per second may be used for films intended for television Systems with a nom- inal 50 Hz field rate. A frame rate of 30 frames per second m
14、ay be used for television Systems with a nominal 60 Hz field rate. A frame rate of 24 frames per second may be used on either type System. 4 Position and orientation of the emulsion The Position of the emulsion and the orientation of the emulsion area being exposed shall conform to figure 1. ISO 25:
15、1994(E) c-0 1 0 0 I / / W-d / / 0 -O / 0 / / SW i ,/ & 39hll Image-forming light Direc tion of film travel l The film is shown as seen from inside the Camera, looking towards the lens with the photographic layer away from the observer, towards the /em. Figure 1 - Position and orientation of the emulsion This page intentionally left blank This page intentionally left blank This page intentionally left blank ISO 25:1994(E) ICS 37.060.10 Descriptors: cinematography, motion-picture film, motion-picture film 16 mm, specifications. Price based on 2 pages
