Negative film shot at a moderate speed and in black and white With a fine, uniform grain structure, Ilford's Delta 100 Professional uses core-shell crystal technology to produce incredibly sharp results. It has a nominal sensitivity of ISO 100/21° when developed using standard black-and-white chemistry, but because of its wide exposure latitude, it can be rated between EI 50 and EI 200 without losing quality. This versatile film is ideal for use in fine art and pictorial work, as well as general applications requiring high-edge sharpness and unobtrusive grain.