A special article in reply to many questions raised by readers of Flash Knowledge about the flash sync cord issue: When using a Prowave trigger, it must be connected to the flash. If the flash has a PC port, it needs to be connected with a PC-1 cord; if the flash does not have a PC port, then you need to purchase a PC-1 flash sync cord and a hot shoe adapter. Also, we would like to inform everyone that the popular Nikon AS-15 hot shoe to PC adapter can be purchased through the link on the Flash Knowledge website.