The concept of this lens hood is strange and yet one wonders if because the engineer had break when it was designed. As described already in other posts, the handling is still not user-friendly. When the panel put on the supplied ring by pressing two buttons flexes the diaphragm, so it is a bit difficult, now get on Angular round lens. The tabs, which are used for locking are made even from plastic and have already after two months of normal use wear on. If Canon is not just what can make screwable?
