Instructions
Turn off all of the equipment, including the camera body and the SB-800 flash unit.
Remove the plug guards. There are two which need to be removed for the SD-8A to connect to the SB-800. Then remove the cover from the three-hole power socket located on the front of the SB-800. This exposes three adjacent holes with metal pins inside. Remove the rubber plug guard from the PC socket on the side of the flash unit.
Insert the power cord of the SD-8A into the power socket on the front of the SB-800. Be sure the connection is secure.
Attach the PC cord to the PC socket on the side of the SB-800.
Power on the camera and the flash to begin using the SD-8A.