DESC: KODAK PROFESSIONAL TRI-X 400 Films are high-speed panchromatic films that are a good choice for photographing dimly lighted subjects or fast action, for photographing subjects that require good depth of field and fast shutter speeds, and for extending the distance range for flash pictures. TRI-X 400 Film (400TX) is available in 120 and 135 sizes and 35 and 70 mm long rolls. You can retouch the 120-size film on the emulsion side. TRI-X 400 Film is recommended for push-processing applications.