1781 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPTAHW3AUMA NO CTAHAAPTW3ALWW·ORGANISATION INTERNATIONALE DE NORMALISATION Cinematography - Projector usage of 8 mm Type S motion-picture film for direct front projection Cinematographie -- Utilisation du film 8 mm type S, dans le projecteur pour la projection frontale directe Second edition - 1983-12-15 UDC 778.55 Ref. No. ISO 1781-1983 (E) ISO 1781-1983 ( matography. pictureprojectors picturefilm photographic images,position(location),orientation,camera speed. Price based on 2pages No reproduction or networking permitted without license from IHS Not for Resale Foreword ISO(the International Organizationfor Standardization)is a worldwide federation of national standards bodies (iSO member bodies). The work of developing International Standards is carried out through IsO technical committees. Every member body interested in a subject for which a technical committee has been authorized 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 1781 was developed by Technical Committee ISO/TC 36, Cinematography This second edition was submitted directly to the Iso Council, in accordance with clause 6.11.2 of part 1 of the Directives for the technical work of ISO. It cancels and replaces the first edition (i.e. ISO 1781-1973), which had been approved by the member bodies of the following countries : Austria India Switzerland Belgium Italy Thailand Canada Netherlands Turkey Czechoslovakia Romania United Kingdom Egypt, Arab Rep. of South Africa, Rep. of USA France Spain USSR Germany, F.R. Sweden The member body of the following country had expressed disapproval of the docu- ment on technical grounds : Japan International Organization for Standardization, 1983 Printed in Switzerland CopyrihtIntenatinal Oorganizatin for Standardization No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD ISO1781-1983 (E) Cinematography - Projector usage of 8 mm Type S motion-picture film for direct front projection Scope and field of application NOTES This International Standard specifies the emulsion orientation, In silent projectors having a fixed rate of projection, the rate shall be 18 frames per second with a tolerance appropriate for its intended use. the rate of projection and the position of the image area for Silent projectors having manually adjustable speed shall be capabie of 8 mm Type S motion-picture film as used for direct front pro- reaching a projection rate of 18 frames per second. jection. 2 It is recognized that under certain conditions, silent material Characteristics 5 Bibliography The emulsion orientation of sound orsilent releaseprints shall be toward the projection lens when the film is threaded for Iso 1787, Cinematography - Camera usage of 8 mm motion- direct front projection, as shown in the figure. picture film perforated Type S. NOTES IS 3645, Cinematography - Image area produced by 8 mm 1This recommendation is feasible since an intermediate optical or TypeSmotion-picturecameraapertureandmaximumproject contact step,necessary for quantity reproduction, can be arranged to ableimagearea-Positionsand dimensions. produce prints with the recommended orientation.A common emul- sion orientation facilitates intercutting among 8 mm Type S release prints and reversal original 8 mm Type S material. Film transport claw 2 It is recognized that some users will require contact reversal prints -2 from original 8 mm Type S, particularly in the amateur field, but since these would not be intercut with commercial prints, picture focus should not be a problem. Reversal reduction prints c