Filmtype: Black&White; Film Format: 35 mm; Speed: ISO 400/27°; Length: 30,5 Meters / 100 ft. The Delta line is Ilford's flagship film. T-grained emulsion results in the finest grain at higher sensitivities. Good negative characteristics. Produces a softer, finer negative as the FP4. Fine-grain loves and 35mm photographers know to appreciate the benefits of this film. Large-format photographers, who don't need to worry about grain, tend to choose the tried-and-true HP-5 emulsion (also due to the price).