Place your order by 4:00 PM Monday, Oct 12 and your order will ship the same day. For further details see delivery estimates in cart. All orders are subject to verification. International orders are processed the next shipping day.
The SD-800 adds a fifth AA battery to the flash. The SB-800 is designed to operate upon 6 volts of power, which is the output of 4 alkaline batteries. NiMh batteries, however, have a lower specified voltage which ideally requires 5 units to deliver ideal voltage to the SB-800.