The MF-14 Data Back (2-MS76) is designed specifically for the F3 and F3HP cameras and can be used with MD-4 motor drive attached. Data back imprints the year, month, day or frame number. Information can be imprinted between the frames leaving the image unaffected. Number imprinting range from -2 to 2000; the year programmed to the year 2100; and daily alarm. Manual ISO film speed setting range: 25-400. The back displays a low battery warning and requires two SR44 batteries.