Ilford 400 delta professional is a fast fine grain black and white film ideal for pictorial and fine art photography prints made from 400 delta professional film exposed at iso 4002 7 have very fine grain and outstanding sharpness a iso 400 high speed film giving images with extraordinary depth and dimension delta 400 professional provides an almost unrivalled combination of speed and sharpness with a width of tonal range that retains subtlety and detail the liberating speed of delta 400