This is a genuine Canon lens hood. It blocks unwanted light from outside the angle of view, suppressing the occurrence of ghosting. Compatible lenses: EF-S10-22mm F3.5-4.5 USM EF16-35mm F2.8L USM EF17-40mm F4L USM Product condition: The exterior shows some minor scratches, but is generally in good condition. The flocking on the inside of the hood is also in good condition.