The FilmTimer application for Apple IOS provides film photographers a tool for making long exposures accounting for reciprocity failure.
The application includes reciprocity failure tables from manufactures as well as tables contributed by well known photographers. The photographer selects his film and metered exposure time, the application then times the exposure to account for reciprocity using it’s built in timer. The photographer can enter their own reciprocity tables so they are not limited to those provided.
The included tables cover popular Black and White films including TMAX 100, TMX 400, TRI-X, Delta 100, and HP5 from several well known sources.