In any case, a lens hood of photographic point of view as well as a must because of the protection of the lens. I once made the mistake of buying an expensive third-party panel. You hakelte and required each time a considerable use of brute force them up and stake out. No question in this Canon Aperture. Fits like a 1, engages smoothly - even at marked to attachment points - and makes no problems. This is also important because it can be really easily reversed plugging save space on the lens for storage and therefore is often set up and sold. The inside is even slightly rough, there to minimize any light reflections occurring, but the lens would then meet. How much the opposite not napped aperture brings to benefit concretely, I do not know. The panel as a whole does in any case very best services.