Hi,i have Nikon d5000 and sb700 flash unit. I can trigger the sb700 remotely using the Nikon d5000 built in flash. But I don't know what is triggering the sb700 flash.I tried shooting in another room so that the built in flash cannot reach (see) the sb700 but it still fires. Now I use this system as so that I cover the built in flash with my hand.Is there a better option and as i said..what is triggering the sb700 in su4 mode?thanks

The forum with users familiar with your Nikon camera and speedight ishttp://forums.dpreview.com/forums/forum.asp?forum=1034&/nikon-d90-d40-d7000-d3000-forum/alyowrote:Hi,i have Nikon d5000 and sb700 flash unit. I can trigger the sb700 remotely using the Nikon d5000 built in flash. But I don't know what is triggering the sb700 flash.I tried shooting in another room so that the built in flash cannot reach (see) the sb700 but it still fires. Now I use this system as so that I cover the built in flash with my hand.Is there a better option and as i said..what is triggering the sb700 in su4 mode?thanks