35mm film remained the standard for photography for decades until digital photography. The film is important because it enabled the miniaturization of cameras.
Background
The Houston brothers invented roll film and sold the rights to George Eastman. Eventually, Thomas Edison purchased 70mm roll film from Eastman to make movies. Subsequently, Edison employee William Dickson sliced it in half, creating 35mm roll film.
Cameras at the time typically used 70mm or larger film. Consequently, they were large, lumbering things, not easy to carry around.
In 1913, the “American Tourist Multiple” became the first 35mm still camera available for purchase. However, it cost $175, just under an average year’s wages. Needless to say, it never caught on.
In 1913, Oskar Barnack, a Leica employee, began to develop a mass-produced 35mm camera. WWI interfered with the development and commercialization effort. However, Leica introduced the wildly popular company Leica I in 1925. Markedly, The small size was a dramatic departure from prior cameras.
35mm Cassette Fim
In 1934, Kodak released preloaded 35mm cassettes that dropped into a camera. Prior to that innovation, photographers had to load film into their cameras in darkrooms.
In 1936, the inexpensive Argus A 35mm camera was introduced. Combined with Kodak’s easy loading film, 35mm photography exploded in popularity. Subsequently, that same year, the Single Lens Reflex (SLR) camera was introduced, allowing photographers to see the exact image the film would record.
By the 1960s, SLR cameras with interchangeable lenses dominated the market. In the 1980s, Kodak release single-use cameras pre-loaded with film. Users took pictures and brought the entire camera, not just the film for developing. Kodak had invented and patented the digital camera a half-decade before, in 1975, but ignored the invention.
Digital Dominates
In 1997, Kodak sold over a billion rolls of film. Twelve years later, on June 22, 2009, announced the cessation of Kodachrome film after 74 years of production. The company declared bankruptcy in January 2012. Digital photography now dominates imaging. However, in 2019, the company still produces a limited line of traditional films for professional photographers.