This is a 50 sheet box of 4 x 5" Fomapan 400 Action film.
FOMAPAN 400 Action is a panchromatically sensitized, black-and-white negative film designed for taking photographs under unfavorable light conditions or using short exposure times. The film meets high requirements for low granularity, good resolving power and good contour sharpness. FOMAPAN 400 Action has a nominal speed rating of ISO 400/27deg., but due to its wide exposure latitude the film gives good results even when overexposed by 1 EV (exposure value) (as ISO 200/24deg.) or underexposed by 2 EV (as ISO 1600/33deg.) without any change in processing, i.e. without lengthening the development time or increasing the temperature of the developer used. To make prints or enlargements, Fomabrom and Fomaspeed type enlarging papers are recommended; however, all sorts of black-and-white enlargement papers can be used.