FOMAPAN 100 Classic is a panchromatically sensitized, black-and-white negative film designed for taking photographs. The film meets high requirements for low granularity, high resolving power and contour sharpness and a wide range of halftones. FOMAPAN 100 Classic has a nominal speed rating of ISO 100/21o , but due to its wide exposure latitude the film gives good results even when overexposed by 1 EV (exposure value) (as ISO 50/18o ) or underexposed by 2 EV (as ISO 400/27o ) without any change in processing, i.e. without lengthening the development time or increasing the temperature of the developer used.

For more info check here.