... extending and shading the end of the lens. Another benefit of the lens' extension is some additional protection from accidental impact.The ... is designed to match the focal length of standard lenses (50mm). Double threaded to accept filters.Size: 49mm,52mm,55mm,58mm ... ,62mm,67mm,72mm,77mm,82mm rubber lens hood 49mm,52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm