This Flash Bounce Diffuser for Nikon SB800 SB-800 SB-600 SB600 is used to create exposures of even density over the entire surface of film. Placing this diffuser on the front of the lens and exposing through it, you will find the light through the diffuser on the film creating an even density across the surface of the film.
Same then the expensive stuff, great
This diffuser works extremely well. I use the TTL mode on my flash so the camera adjusts the settings, and I have not had any problems or issues at all.
Half the price of a brand name, just as good, very happy with it.