Analysis of information sources in references of the Wikipedia article "Super 8 film" in English language version.
After several years of research, Kodak offered super 8 format film in Instamatic cartridges in 1965.
The sound cartridges are bigger than the silent ones, so they won't fit silent cameras (though silent cartridges fit sound cameras) and they cost about $1.75 more than their silent equivalents. For professional applications, Kodak also plans a 200-foot cartridge that will fit through a trap-door in the top of one of its Ektasound cameras; other cameras for this cartridge will soon be available.
In April of 1965, this revolutionary new format was introduced...
