1、BRITISH STANDARD BS ISO 491:2002 Cinematography 35 mm motion-picture film and magnetic film Cutting and perforating dimensions ICS 37.060.20 BS ISO 491:2002 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Policy and Strategy Committee, was
2、 published under the authority of the Standards Policy and Strategy Committee on 20 August 2002 BSI 20 August 2002 ISBN 0 580 40290 8 National foreword This British Standard reproduces verbatim ISO 491:2002 and implements it as the UK national standard. It supersedes BS ISO 491:1995 which is withdra
3、wn. The UK participation in its preparation was entrusted to Technical Committee CPW/36, Cinematography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement internat
4、ional publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include
5、all the necessary provisions of a contract. Users are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiri
6、es on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank p
7、age, pages 1 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 491:2002(E)INTERNATIONAL STANDARD ISO 491 Sixth edition 2002-08-01 Cinematography 35 mm m
8、otion-picture film and magnetic film Cutting and perforating dimensions Cinmatographie Film cinmatographique et magntique de 35 mm Dimensions de coupe et de perforation BSISO491:2002BSISO491:2002iiIS:194 O2002(E) I SO 2002 All irthgs ersedevr iiiForeword ISO (the International Organization for Stand
9、ardization) 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. Each member body interested in a subject for which a technical committee has been established has the right
10、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 of electrotechnical standardization. International St
11、andards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an I
12、nternational Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent r
13、ights. ISO 491 was prepared by Technical Committee ISO/TC 36, Cinematography. This sixth edition cancels and replaces the fifth edition (ISO 491:1995), which has been technically revised. Annex A forms a normative part of this International Standard. Annex B is for information only. BSISO491:2002iii
14、INTENRATIONAL TSANDADR IS:194 O2002(E)I SO 2002 All irthgs ersedevr 1Cinematography 35 mm motion-picture film and magnetic film Cutting and perforating dimensions 1 Scope This International Standard specifies the cutting and perforating dimensions for 35 mm unexposed motion-picture film and 35 mm ma
15、gnetic film, and the types of perforations used. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publ
16、ications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to a
17、pplies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 554:1976, Standard atmospheres for conditioning and/or testing Specifications ISO 18906:2000, Imaging materials Photographic films Specifications for safety film 3 Conditions for the measurement of dime
18、nsions The dimensions and tolerances specified in this International Standard apply at the time of manufacture, measured under atmospheric conditions of (23 1) C and (50 5) % relative humidity, as specified in ISO 554 1) . A manufacturer may indicate other nominal temperatures and humidity under whi
19、ch dimensions apply. 4 Dimensions 4.1 Dimensions of motion-picture film The dimensions shall be as shown in Figures 1 and 2 and given in Table 1. They apply to unexposed motion- picture and magnetic film which conform to ISO 18906. These specifications apply at the time of cutting and perforating. 4
20、.2 Dimensions of magnetic film With regard to 35 mm magnetic films, the dimensions which apply are those specified in Table 1 under the designation “Type P” with a perforation pitch B and the length of any 100 consecutive intervals L. 1) All measuring instrument calibrations should be referred to a
21、temperature of 20 C (as specified in 1) and a relative humidity of 50 %. BSISO491:20021IS:194 O2002(E) 2 I SO 2002 All irthgs ersedevr Table 1 Dimensions in millimetres Dimension Type P Type N Type DH A 34,975 0,025 34,975 0,025 34,975 0,025 B 4,75 0,01 4,75 0,01 4,75 0,01 B 4,74 0,01 4,74 0,01 C 2,
22、794 0,010 2,794 0,010 2,794 0,010 D 1,981 0,010 1,854 0,010 1,854 0,010 E 2,01 0,05 2,01 0,05 2,01 0,05 F 28,17 0,03 28,17 0,03 28,17 0,03 G 0,025 max. 0,025 max. 0,025 max. H 2,08 nom. R 0,50 0,03 0,13 max. 0,33 0,03 L 475,00 0,38 475,00 0,38 475,00 0,38 L 474,00 0,38 474,00 0,38 NOTE 1 While curre
23、nt usage is that type N perforations may be used for camera and intermediate films and type P perforations for print films, the long-term objective should be for all 35 mm films to have type P perforations. NOTE 2 Dimensions L and L represent the length of any 100 consecutive perforation intervals.
24、NOTE 3 Dimensions B and L (short perforation pitch) are provided to fulfil the requirements of continuous sprocket contact printing. NOTE 4 See annex A for full information concerning the same dimensions expressed in inches. BSISO491:20022IS:194 O2002(E) I SO 2002 All irthgs ersedevr 3Figure 1 Dimen
25、sions of 35 mm motion-picture film Figure 2 Types of perforation BSISO491:20023IS:194 O2002(E) 4 I SO 2002 All irthgs ersedevr Annex A (normative) Dimensions in inches The same dimensions as those in Table 1 can be expressed in inch units. These dimensions shall be as shown in Table A.1. Table A.1 D
26、imensions in inches Dimension Type P Type N Type DH A 1,377 0,001 1,377 0,001 1,377 0,001 B 0,187 0 0,000 4 0,187 0 0,000 4 0,187 0 0,000 4 B 0,186 6 0,000 4 0,186 6 0,000 4 C 0,110 0 0,000 4 0,110 0 0,000 4 0,110 0 0,000 4 D 0,078 0 0,000 4 0,073 0 0,000 4 0,073 0 0,000 4 E 0,079 0,002 0,079 0,002
27、0,079 0,002 F 1,109 0,001 1,109 0,001 1,109 0,001 G 0,001 max. 0,001 max. 0,001 max. H 0,082 nom. R 0,020 0,001 0,005 max. 0,013 0,001 L 18,700 0,015 18,700 0,015 18,700 0,015 L 18,660 0,015 18,660 0,015 NOTE The notes to Table 1 apply. BSISO491:20024IS:194 O2002(E) I SO 2002 All irthgs ersedevr 5An
28、nex B (informative) Additional data B.1 Uniformity of perforating The uniformity of pitch, hole size and margin (dimensions B or B, C, D and E) are important variables affecting image steadiness. Variations in these dimensions within a roll from one perforation to the next are more significant than
29、variations from roll to roll. In fact, it is the maximum variation from one set of four perforations to the next within any small group of consecutive perforations that is the most important variable. B.2 Dimensional stability During its life, film can shrink or swell due to changes in temperature o
30、r to loss or gain in moisture content. In addition, triacetate-based film can shrink due to the loss of solvents or plasticizers. These changes may result in changes in the dimensions. The change is generally uniform through the roll. B.3 Definition of low-shrinkage film Low-shrinkage film is film w
31、hich shrinks no more than 0,2 % from its original dimensions at the time of cutting and perforating, after the film has been: a) kept in the manufacturers normal commercial packing for six months at recommended storage conditions; b) exposed; c) processed and dried as recommended by the manufacturer
32、; d) stored in roll form, exposed to air, for a period not exceeding 30 d at 18 C to 24 C and 50 % to 60 % relative humidity. The film is measured under the same conditions of temperature and humidity as defined in clause 3. B.4 Choice of longitudinal pitch The choice of different pitch (B: long pit
33、ch, and B: short pitch), for original and print motion-picture films, depends on the necessity of printing and the type of printer used. In the most common type of printer, the original and print films move continuously over a printing sprocket. Consequently, the original film must be shorter In pit
34、ch than the print film in the approximate proportion of the thickness of the film to the radius of curvature of the printing sprocket. With current printing sprocket design, the value for this pitch differential is 0,3 %, with experience showing that a tolerance of 0,1 % is acceptable. With “Iow-shr
35、inkage” film base, it is common manufacturing practice to set the aim for the pitch of original films at a value of 0,2 % shorter than that of the films on which they will be printed. The additional shrinkage that occurs in the original film, because of processing and ageing before printing, should
36、result in the desired (0,3 0,1) % shorter pitch. BSISO491:20025IS:194 O2002(E) 6 I SO 2002 All irthgs ersedevr B.5 Effect of humidity It is a common tendency of the film to expand when exposed to high relative humidity. Allowance should be made for this factor in equipment design. BSISO491:20026IS:1
37、94 O2002(E) I SO 2002 All irthgs ersedevr 7Bibliography 1 ISO 1, Geometrical Product Specifications (GPS) Standard reference temperature for geometrical product specifications BSISO491:20027BS ISO 491:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independ
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