This has to be one of the best purchases i've made for my Nikon D40. When I purchased the SB-400 flash the only concern I had was not being able to take portrait/horizontal pictures. (you know where you take pictures turning the camera turns on its side). With the Sto-Fen Omni-Bounce on I'm able to turn the camera on its side, and get comparable warm lighting results similar to the effect of bouncing the SB-400 flash when the camera is in a vertical or upright position. I assure you that you're gonna love this small but highly effective addition to your external flash kit!