JJC LH-78F Lens Hood features a filter access window for easier adjustment of specialty rotating filters such as ND and CPL filters while the hood is in place. There is no vignetting with the hood on. It can also be placed backwards over the lens for a more compact storage solution. The hood allows you to put on a lens cap, too. JJC LH-78F lens hood replaces Canon EW-78F Fits Canon RF 24-240mm f/4-6.3 IS USM Lens