MobileSharp3 Color Pop Up Flash Diffuser for Canon 750D 760D 7D 5D Nikon Panasonic Pentax Use the diffuser by placing it flush against the front of the lens and exposing through it. Flash straight on if without our diffuser causes the light to go forward only and creates a harsh shadow behind the subject. It helps to reduce hard background shadows and eliminates the annoying red eye effect. The diffuser is used to create exposures of even density over the entire surface of film. High Quality and 100% Brand New