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Functions include: imprinting the time, date (in any of three orders) consecutive numbers or fixed numbers. Imprint exposure is automatically set according to the film speed in use. The Program Back 70 is also capable of intervalometer operation as well as timed long exposures.
Starting time can be displayed up to 99 hours, 99 minutes. Automatic flash control turns the flash on just before its needed and off after each exposure. The back is powered by two 1.5v batteries.