Omni-Bounce 3 Color White Blue Yellow Diffuser Box Cap fits Nikon SB-900 SB-910 This diffuser is used to create exposures of even density over the entire surface of film.Use the diffuser by placing it flush against the front of the lens and exposing through it. The flash with our diffuser installed and tilted at 45 degrees gives a nice soft wrap around of light with a soft shadow behind the subject. This fits cleanly over the head of your existing flash, no need for cumbersome attachments, hooks. It helps to reduce hard background shadows and eliminates the annoying red eye effect. With our Blue Yellow White diffusers, you can develop your lighting creativeness, resulting in different image effect.