The Ilford Delta 400 Professional is a high-speed black and white negative film, featuring Core-Shell Crystal technology for high sharpness with a fine, uniform grain structure. It has a nominal sensitivity of ISO 400/27°, is suitable for handheld photography, and performs well in challenging lighting conditions. Additionally, this versatile film boasts a wide tonal range and exposure latitude between EI 200 and EI 3200, which can be adjusted during photo development to maintain consistent contrast.