Data Memory Back 90: For use with T90. Automatically records up to 16 types of data and exposure controls. Data Function options include: date (up to year 2099), day/hour/minute in 24 hour format, and frame counter up to 4 digits. Memory Function exposure information options include: shutter speed, aperture, shooting mode, metering mode, flash, film speed and 10 others including the date and frame counter. Standard mode records 16 types of information for up to 156 frames. Reduced mode records 6 types of data for up to 338 frames. Data displayed on LCD monitor panel.