The Bower 52mm Lens Adapter with Hood for PowerShot G10 from Canon screws onto the face of the Canon G10 around the lens and is required in order to attach optional accessories to the camera.
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact
In the Box
Bower 52mm Adapter Tube for the Canon Powershot G10