Omni-Bounce Diffuser OMEW For The Canon 430 EX 430EX The Omni-Bounce creates a Diffused Bare Bulb Effect, giving even coverage across the entire frame with lenses from 15mm to 200mm in the 35mm format. The Omni-Bounce is easy to use and goes onto and off of your flash in seconds with custom fitting, except UNI, and No Velcro.