i love this lens hood! i wish i would have ordered it three years ago! i've been using lens hoods on all my big lenses, but hadn't ever gotten around to getting one on my 55--250mm is lens... what was i thinking?the lens hood came early, was the exact item i ordered and works marvelously! slipped right on first try, reverses perfectly as mentioned by others for storage. love it! i take a lot of photos in the early morning and late evening sun and this is just what i've needed. i shoot with a canon 100--400mm l is lens quite a bit and never shoot without it. i've recently started using this 55--250 is lens again quite a bit and man, i needed this lens hood. very, very pleased.some people may need to know that the lens hood does go on very easily if you put it on the correct way. when it's fitted properly, the canon name will be at the bottom. i've seen some people try to mount it with the letters starting to the right of the top, but they need to start from the left side of the top and twist down until it locks into place with the canon name on the bottom. no problem if you do that!great accessory, don't hesitate, it's just as promised!