17.5 mm film

Afterward, this format continued to be used primarily in developing countries such as India, or for projects where usage of regular 35 mm film would have been too expensive.

The British-American photographer and inventor Birt Acres split 35 mm film in half for his Birtac camera-projector in 1898.

[4] The pocket-sized, 800 gram, Kino 17.5mm used unperforated 35mm film sliced lengthwise with sprocket holes that ran down the centre.

It could be processed with a reversal development kit that Ernemann also provided, and the camera doubled as a projector when a lamp housing was attached.

In addition, he encouraged those who took it up to contribute their films to a catalogue of prints to which he added professional movies, and also Kretzschmar's, which could be purchased for home theatres.