35mm Film

35mm is what a century of cinema was shot on, so it is the reference every other format is judged against. A frame on it reads as a film without anything else being done.

The reason is the highlights. Film keeps rolling as a bright area gets brighter, so a lamp, a window or a sky holds its shape where a video sensor would cut it flat.

The film is 35 millimetres wide with four perforations per frame, which is the standard set in the 1890s and kept ever since.

Grain is present but fine. It gives texture at normal viewing size and only becomes a pattern on a very large screen.

Colour comes from three layers of emulsion rather than a filter over a sensor, which is why the crosstalk between them renders skin the way it does.

Use it whenever the job is to look like a film rather than like footage, and for any period from the 1920s to now.

Skip it when you want the picture to look current and clean. A modern digital body renders sharper and reads as now.

A 35mm lens is a focal length, and it has nothing to do with this. One is the width of the film and the other is the distance inside the glass, so always say film stock when you mean the gauge.

16mm is a quarter of the area. Look at the grain: fine and even is 35mm, present and moving is 16mm.

35mm carried commercial cinema from the silent era into the 2010s and is still ordered for features that want it. Kodak and Fujifilm built whole stock ranges around it, and the way it handles a bright window is what people mean when they call a shot filmic.

The model reads the number as a lens and returns a moderate wide shot with nothing filmic about it. Write 35mm film stock, never 35mm alone.

The other failure is clipped highlights. Ask for highlights rolling off gently, because that rolloff is the clearest difference from video.