135 (aka 35mm)

Kodak introduced the 135 film format in 1934 in a light-sealed metal cartridge with enough film for 12, 24, or 36 exposures per roll. This format is usually referred to as 35mm, which is the approximate width of the film, not the size of the exposed image. There are eight perforations, or sprocket holes, on both sides of every frame that are used to feed the film through the camera and rewind it before processing.

The first 135 film was black and white and introduced in 1934, followed by color in 1936. Slide film, also known as reversal or transparency film, is also produced. 135 film was the most widely used film in the world until the introduction of digital photography. The 135, 828, and 126 film formats are all the same width (35mm) but differ in how they are perforated and the size and arrangement of the frame exposure area.

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