How the Sto-Fen Omni works!
With Omni-Bounce on the Flash Unit
Flash with the Omni-Bounce installed and tilted to 45 degrees gives a nice soft wrap around of light with a soft shadow behind the subject.
Straight on Flash (Without the Omni-Bounce)
Flash straight on without the Omni-Bounce causes the light to go forward only and creates a harsh shadow behind the subject.