sony doesn't have a diffusser, the only one is the bounce reflector V from Minolta... not sure if sony have it for the flash thou.
you can either get a lightsphere or a stofen omnibounce. be sure to test before you buy cos the flash have a clip on the bottom, so if there isn't a gap for the nib, your diffuser wouldn't hold itself in place.
Called... they spoke about Lightsphere C3. How does that compare with the Stofen 5600? I'm venturing into portrait and event photography. Which would you recommend? Sorry, i'm abit of a blur when it comes to this..