Definitions for "Fast Film"
Radiographic film which has inherent graininess characteristics of a coarse nature intended to increase the relative film speed.
Is film which has an emulsion that is very sensitive to light. These film have high ISO ratings.
Film with an emulsion that is very sensitive to light. Such films have high ISO ratings (i.e.: ISO1600). They are all, however, more grainy than there slower counterparts. (see Grain& ISO)