9.5mm Film

9.5 mm film is an amateur film format introduced by Pathé in 1922 as part of the Pathé Baby amateur film system. It was conceived initially as an inexpensive format to provide copies of commercially made films to home users, although a simple camera was released shortly afterwards.

The format uses a single, central perforation (sprocket hole) between each pair of frames, instead of 8mm, which has perforations along one edge, and most other film formats, which have perforations on each side of the image. The single hole allowed more of the film to be used for the actual image, and the image area is almost the same size as 16 mm film. The perforation in the film is invisible to viewers, as the intermittent shutter blocks the light as the film is pulled through the gate to the next frame.