This standard specifies the orientation of the film emulsion layer used in 35mm movie cameras, the position of the picture and optical sound exposure area, and the shooting frequency. This standard applies to 35mm movie cameras. GB/T 4640-2000 Usage of 35mm movie film in cameras GB/T4640-2000 Standard download decompression password: www.bzxz.net
This standard specifies the orientation of the film emulsion layer used in 35mm movie cameras, the position of the picture and optical sound exposure area, and the shooting frequency. This standard applies to 35mm movie cameras.

ICS 37.060.20
National Standard of the People's Republic of China
GB/T4640\u20142000
eqv IS0 23: 1993
Camera usage of 35 mm motion-picture film2000-10-17 Issued
2001-03-01 Implementation
Issued by the National Quality and Technical Supervision Commission
GB/T4640\u20142000
This standard is a revision of the national standard GB4640-1984 based on the international standard ISO23:1993. This standard is the basic standard. In the revision process, in accordance with the principle of actively adopting international standards and foreign advanced standards, the "Technical Specification for the Usage of 35 mm Motion-picture Film in Cameras" was equivalently adopted. The technical content is consistent with the international standard 1SO23:1993 "Film-
Standard 15O23:1993", but the description of the standard clauses is different from the international standard IS023:1993. Therefore, the revised national standard is equivalent to the international standard. The International Organization for Standardization IS0/TC36 revised the international standard TS023.1976 in 1993. During the revision process, some technical contents in Article 4.2 and Article 5 of the original standard were modified. Therefore, when revising the national standard, in combination with my country's national conditions, the relevant technical contents were modified in accordance with the international standard TS23:1993 to make it more suitable for the needs of my country's actual situation. This standard was proposed by the State Administration of Radio, Film and Television. This standard is under the jurisdiction of the China Film Science and Technology Research Institute. This standard was drafted by the China Film Science and Technology Research Institute. The drafter of this standard: Wu Shuzhi.
This standard was first issued in 1984 and this revision is the first revision. This standard is entrusted to the China Film Science and Technology Research Institute for interpretation. GB/T4640\u20142000
ISO Foreword
[ISO (International Organization for Standardization) is a worldwide federation of national standards associations (ISO member groups) of various countries. The formulation of various international standards It is completed by the ISO technical committee. Any member group interested in the topics being studied and discussed by the existing technical committee has the right to send representatives to attend the meeting. Official and non-official international organizations affiliated with the International Organization for Standardization may also participate in this work. ISC) and the International Electrotechnical Commission (IEC) have close cooperation in the field of international electrotechnical technology. All draft international standards passed by the technical committee should be circulated to member groups for comments. At least 75% of the members must vote in favor for the standard to be approved.
International Standard ISO23 was developed by TSO/TC36 Film Technical Committee. This standard is the first edition, which cancels and replaces the first edition (ISO23:1976), and some technical contents in the second edition have been modified. Scope
National Standard of the People's Republic of China
Use of 35mm movie film in camerasCamera usage of 35 mm mution-picture filmGB/T4640\u20142000
eqv ISO 23: 1993
Replaces GB/T 4640\u20141984
This standard specifies the orientation of the film emulsion layer used in 35 mm movie cameras, the position of the surface and the optical sound exposure area, and the shooting frequency.
This standard is applicable to 35 mm movie cameras. 2 Reference standards
The provisions contained in the listed standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest version of the following standards IS 2906: 1984 Movie
35 mm Motion picture film storage Position and size of the image formed by the film window of the camera
GB/T4635-198435 mm Position and size of the image formed by the film window of the movie camera on the film (neqIS0 2906:1972)
3 Position and orientation of the film emulsion layer
Except for special purposes, the film emulsion layer must face the movie camera lens. The position of the image formed by the film window on the film refers to GB/T4635.
Photographic frequency
4.1 Except for special photographic methods such as high-speed photography, slow photography, etc., the photographic frequency of the movie camera is 21 frames/second. 4.2 For films used only for television systems, the camera's photographic rate is 25 frames/second. The horizontal relationship between the picture and the center line of the film During the printing process, if an optical sound track is to be printed on the film, the perpendicular midline of the camera window should be offset horizontally from the center line of the film to leave the position of the optical track in accordance with the provisions of GB/T4635. Approved by the State Administration of Quality and Technical Supervision on October 17, 2000, implemented on March 1, 2001
GB/T 4640\u20142000
Position of the picture and the optical sound track (see Figure 1)6
Direction of film movement
Direction of light
Image formation
The motion picture film shown in Figure 1 is viewed by an observer from inside the camera toward the camera lens, with the emulsion layer facing away from the observer and toward the lens.
People's Republic of China
National Standard
Use of 35 mm motion picture film in camera GB/T 4640 2000
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