What does film 8 mm 16 mm 32 mm mean? What is the difference?

We are talking about the specifications of the film. The width of standard film is 35mm, and there are perforations on both sides, so the film can be rolled. If you intercept a piece of film, it is a string of 35mm*24mm rectangles from top to bottom, with an aspect ratio of 3:2. Showing a film is what we often call a standard picture.

In addition to 35mm film, there is 70mm ultra-wide film, which is usually used to shoot movies with large scenes and ultra-wide screens. There are also 17.5mm and 8.75mm films, commonly known as 16mm and 8mm films (rounded), which are designed to simplify the projection equipment. The projection effect of these films is not as good as that of 35mm film, but the corresponding projection equipment is much lighter. For example, 8mm projection equipment can be carried by one person, and 35mm projection equipment needs a car to carry it.

However, the 8mm film is too narrow to leave the position of sound track on the film (all other films have sound tracks, which can play sound and image simultaneously), so the 8mm film is silent. If sound is needed, additional recording equipment should be provided.