IS02939:2015(E) 5 Technicalcharacteristics Spaces between imagef frames,the image and the soundrecord and perforations shouldbe substantiallyopaque. Table1-Dimensionsofpictureimagearea Dimensions mm in A 7,87 +0,08 0,15 900°0 Bref 21,77 0,857 Cnom 18,75 0,738 Dmin 29,64 1,167 Hia 18,60 min. 0,732 min. H2b 16,00 min. 0,630 min. H3c 12,80 min. 0,504 min. Rmax 0,8 0,03 E=F ±0,25 ±0,010 K=L approximately equal approximately equal For wide-screen films with anamorphic pictures and aspect-ratios from 2,35:1 to 2,39:1. Forfilms with non-anamorphic pictures and an aspect-ratio of 1,37:1. For film with a non-anamorphic picture intended for projection with the picture masking and aspect ratio up to 1,85:1. @ IS0 2015 - All rights reserved tional Organization for Standardizatior IS02939:2015(E) 2 IMAGE Key location of axis ofintended image 1 reference edge 3 2 direction of lightbeam 4 directionoffilmtravel NOTE Thefilm is shown as it would be seen fromtheprojector light sourcelookingtowards thelens with the photographiclayertowardstheobserver. Figure1-Positionanddimensionsofpictureimagearea 3 led by IHS undor license with ISO 4001, User=trert, rtyrtyrty No reproduction or networking permited without license from IHS Not for Resale, 07/09/2015 01:26:50 MDT IS02939:2015(E) Annex A (informative) Compensationforslowspeedofsoundinair ISo 2939:1986, which is the second edition, specified a sound-to-picture displacement of screen requires a 1-frame advancement of sound relative to picture to compensate for the relatively slow speedof sound in air,and thatthis advancementis achieved when a leaderfilm,madein accordance withIs0 4241,is usedtoassist in the threading offilm so that theanalogue sound pickup is 20frames inadvanceofthepicturegate,i.e.21framesminus1frame. It hasbeenfound thatsuchcompensationhasnotbeenadoptedinthefield and thattypical international laboratorypractice hasbeen toimplementa2o-framedisplacementin spite oftheprovisions of previous editions of this International Standard.Ithas alsobeenfoundthatadvancement of sound causes early soundrelativeto imagewhen viewing distances arerelatively closeand that,because early sound is not a naturally-occurringphenomenon,this is found objectionablebymany cinema-goers.It is a natural phenomenon to experience,andthus tolerate,latesound relativeto image when viewing distances are greater.The need for compensation is,therefore,largely unnecessary and unwelcome. 4. @IS0 2015 -All rights reserved 1, Usortrert, rtyrtyrty se trom IHs IS02939:2015(E) Bibliography [1] Is0491:2002,Cinematography35mmmotion-picturefilmandmagneticfilm-Cuttingand perforating dimensions [2] Is02906:2002,Cinematography-Imageareaproducedbycameraapertureon35mmmotion- picturefilm-Positionanddimensions [3] [4] IS08567:2002,Cinematography-Maximumpermissibleareaforsubtitleon35mmand16mm motion-picturereleaseprints-Positionanddimensions organizasntorSandardzaon rights reserved 5 d by IHS undor licens so with ISC Licensee=University of Albe 001, Usortrert, rtyrtyrty tod without license from IHS No reproduction or networking permitte IS02939:2015(E) ICS 37.060.20 Price based on 5 pages Licansenveraiy f Abr/5966B401, Usortret, yy No reproduction or networking permitd without license from IHS IS02939:2015(E) ICS 37.060.20 Price based on 5 pages Licansenveraiy f Abr/5966B401, Usortret, yy No reproduction or networking permitd without license from IHS IS02939:2015(E) ICS 37.060.20 Price based on 5 pages Licansenveraiy f Abr/5966B401, Usortret, yy No reproduction or networking permitd without license from IHS