1、IS0 26 93 M 4851903 0535830 134 I NTERNATIONAL STANDARD IS0 26 Third edition 1993-05-1 5 Cinematography - Projector usage of 16 mm motion-picture films for direct front projection - Specifications Cinmatographie - Utilisation du film 16 mm dans le projecteur pour la projection frontale directe - Spc
2、ifications Reference number IS0 26:1993(E) IS0 26 93 485L903 0535833 070 IS0 261993(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out t
3、hrough 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, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 colla
4、borates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by
5、 at least 75 % of the member bodies casting a vote. International Standard IS0 26 was prepared by Technical Committee ISOflC 36, Cinematography. This third edition cancels and replaces the second edition (IS0 26:1985), of which it constitutes a technical revision. Annex A of this International Stand
6、ard is for information only. O IS0 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. International Organization for Stand
7、ardization Case Postale 56 CH-1211 Genve 20 Switzerland Printed in Switzerland ii IS0 2b 93 m 4853903 0535832 TO7 m INTERNATIONAL STANDARD IS0 26:1993(E) Cinematography - Projector usage of 16 mm motion-picture films for direct front projection - Specifict ions 1 Scope This International Standard sp
8、ecifies the emulsion orientation, the rate of projection, the position of the projected image area and the relationship between picture and sound in the projector, intended for direct front projection of 16 mm motion-picture films with photographic and magnetic sound records and 16 mm silent motion-
9、picture films. 2 Normative 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 agreeme
10、nts based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 490:-”, Cinematography - Magnetic stripes and ma
11、gnetic recording head gaps for sound record on 16 mm motion-picture film perforated along one edge (Type I) - Positions and width dimensions. IS0 4243:1979, Cinematography - Picture image area and photographic sound record on 16 mm motion-picture release prints - Positions and dimen- sions. 3 Emulsi
12、on orientation For 16 mm film, the emulsion position is dependent on the process of preparation and either emulsion-to- light source or emulsion-to-objective lens orientation can be encountered. The actual emulsion position should be indicated by a clear statement or diagram on the leader and on the
13、 label of the film container as recommended in IS0 5768 and IS0 8400. 4 Rate of projection The rate of projection shall be 18 frames per second f 1 frame per second (preferred) or 16 frames per second $1; frames per second for silent motion- picture films and 24 frames per second f 1 frame per secon
14、d for sound motion-picture films. NOTES 1 Silent projectors having manually adjustable speed should be capable of reaching projection rates of 16 and 18 frames per second. 2 When a sound film is used in television in areas where the mains electricity supply is a.c. at 50 Hz, a rate of pro- jection o
15、f 25 frames per second applies. 5 Position of projected image area The projected image area shall be located in the ver- tical direction so that the horizontal axis of the pro- jected area passes through the middle of the distance between the film perforations, as shown in figure1 (dimension A). It
16、is recommended that projectors be provided with a framing adjustment of 0,5 mm (0,020 in) minimum above and below the nominal position. 6 Relationship between picture and sound record in the projector The sound record as located in the film path of the projector shall precede the centre of the corre
17、spond- ing picture by the distances specified in IS0 490 and IS0 4243. 1) To be published. (Revision of IS0 490:1978) 1 IS0 26 73 W 4851703 0535833 q3 IS0 26:1993(E) NOTES 4 Picture/sound displacement for prints with magnetic sound is specified in IS0 490 as 28 frames f 1 frame, and 3 Picture/sound
18、displacement for prints with photographic preferably 28 frames f 0,5 frame. sound is specified in IS0 4243 as 26 frames f 1 frame, and preferably 26 frames f 0,5 frame. Light beam The film is shown as seen from the light source in the projector looking towards the projector lens. Figure 1 2 IS0 26 9
19、3 4853903 0535834 BBT IS0 26:1993(E) Annex A (informative) Applications The rate of projection, 24 frames per second (see clause 41, is primarily intended for professional appli- cation of 16 mm sound motion-picture prints. For striped and a magnetic sound record added. non-professional applications, films may be shot at the rate of 16 to 18 frames per second, magnetically 3 IS0 26 93 = 4851903 0535835 7Lb IS0 26:1993(E) UDC 771.531.352:778.55 Descriptors: cinematography, motion-picture film, motion-picture film 16 rnrn, projection, specifications. Price based on 3 pages
