These are great articles, many thanks to TRLcam. I have been putting together a system based on this and have found that the ishoot slaves have possibly changed in recent times because they don't support the waking up of a flash that has the standby function. So the first time the camera fires, there will be no flash. From then on for the same sequence all is ok. I have had to move to the Yongnuo RF-603N II which works well with the SB-28 but I don't know how long they last in the field. Time will tell.