FOMA Fomapan 400 120 Medium Format FilmSensitivity: ISO 400 27. In the north Bohemian town of Hradec Kralove, Foma has been producing photo materials since 1921. The Fomapan 400 is a flexible, medium speed film which is relatively forgiving of errors in exposure. It tends to have a bit less negative density in the shadow areas. This is the least expensive ISO 400 27 Film which is available in all formats from 35mm to sheet film. Fomapan 400 is an excellent mid range film at a good price.