本国际标准规定了摄像机光圈图像的尺寸以及预期图像区域的垂直和水平中心线相对于35mm电影摄像机的参考边缘和底片穿孔的相对位置。 用于不同用途的电影摄影机需要不同的光圈大小。本国际标准规定了用于以下目的的四种类型的光圈产生的图像尺寸。 风格A:每帧四个穿孔的非对称声音电影。 风格B:每帧四个穿孔变形的声音电影。 风格C:每帧四个孔仪器摄影和全画幅电影。 风格D:每帧电影有三个穿孔。 本国际标准还规定了35毫米电影摄影机的感光乳剂位置和帧速率。

This International Standard specifies the dimensions of the camera aperture images and the relative positions of the vertical and horizontal centrelines of the intended image area with respect to the reference edge and the perforations of the camera negative film for 35 mm motion-picture cameras. Motion-picture cameras used for different purposes require different aperture sizes. This International Standard specifies the image dimensions resulting from four styles of apertures used for the following purposes. Style A: Four perforations per frame nonanamorphic sound motion pictures. Style B: Four perforations per frame anamorphic sound motion pictures. Style C: Four perforations per frame instrumentation photography and full-frame motion pictures. Style D: Three perforations per frame motion pictures. This International Standard also specifies the position of the photographic emulsion and the frame rate for 35 mm motion-picture cameras.