Sto-fen Omni-Bounce £17, $11
The Omni-Bounce is a translucent cap which outputs light in all directions. With your flashgun’s head angled at about 45°, some light is fired forward, but is also bounced off surrounding walls and ceilings to soften the illumination without using a bulkier modifier. It’s effective indoors, but not so useful outdoors – plus you might want to avoid leaving it fitted all the time, as there is a significant amount of light loss.
The Sto-Fen range is flash gunspecific, and the plastic cap simply push-fits onto your flashgun in an instant. This is a great time-saver, but it does mean you’ll need to purchase a new diffuser for each model when upgrading flashguns. That’s no big hardship given the relatively low price, although even this seems a bit much for such a basic piece of plastic.
The Omni-Bounce is a faff-free way to softer flash lighting, though it’s far from the softest