SMPTE 59-1998

This standard specifies the dimensions of the camera aperture images and the relative positions of the vertical and horizontal centerlines 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 standard specifies the image dimensions resulting from three styles of apertures used for the following purposes:
Style A: Nonanamorphic sound motion pictures
Style B: Anamorphic sound motion pictures
Style C: Instrumentation photography and special processes
This standard also specifies the position of the photographic emulsion and the frame rate for 35-mm motion-picture cameras.