Bolta film

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Bolta film is a variety of unperforated 35mm film with paper backing. The film advance can be controlled by a red window, so that cameras using Bolta film were simpler and cheaper than those using perforated 35mm film.

Bolta film was introduced in 1936 by the German company Bolta-Werk for its Boltavit model. The Bolta company was renamed Photavit and abandoned this special film after some time. A Japanese camera called Boltax introduced that film size in the country in the late 1930s. The Bolta-size cameras were quite popular in Japan until well into the 1950, such as the Start 35.

828 film and the film Konishiroku produced for the Konilette are two different formats that add a paper backing to 35mm film stock.