Fotga 40.5mm Super Slim UV Ultra Violet Filter Lens Protector Circular Glass for Canon Nikon Sony DSLR Camera Lens Fits for 40.5mm lens, slim and exquisite design. Block ultraviolet radiation, but let visible light through. Reduce haziness and take clearer scenic shots. Used mainly for lens protection in the same way as clear filters. Provide both-side thread, so you can attach other accessories on it.