Since Canon unfortunately the backlight or not Steulichtblende not mitliefert at the cheaper lenses, you have to then buy this from the accessories ..... This fits here like a glove and is doing what it should ....... prevent the light entering the lens. The tulip shape is to use but only for STM lenses, as they do not rotate forward during focusing. But that is indeed in the item description)
From me there 5 star and I would buy repays again.