A photographic light diffuser includes a tubular body which is adapted to be mounted on a photographic light source and when so mounted is self-supporting without an internal or external supporting frame or without removably connected rigidly panels, the tubular body has pairs of opposed wall panels,...http://www.google.fr/patents/US5311409?utm_source=gb-gplus-shareBrevet US5311409 - Collapsible photographic light diffuser
