ABS reversible-design allows you to mount the hood in reverse for compact-storage. The EW-65C Lens Hood is designed to unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added of extra-protection from accidental In backlight-, side light or photography, it can the entry of non-imaging light and avoid-haze. for RF16mm F2.8 Lens;