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A continuous tone, panchromatic black-and-white negative film that is especially useful for photographing dimly lighted subjects, fast action, extended range flash pictures, and subjects that require good depth of field. This film is highly useful for scientific and biomedical work, especially when fluorescence photography is required. Its high speed (EI 400), very high sharpness, extremely fine grain, and high resolving power enable a high degree of enlargement. You can expose it at a speed of EI 800 with normal processing, or at EI 1600 with push-processing to obtain excellent results.