FODSLR 3pcs White Yellow Blue Color Puffer Pop-Up Flash Soft Diffuser Cover Dome for Speedlite Canon Nikon Pentax Camera DSLR The diffuser is used to create exposures of even density over the entire surface of film. 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. The flash with our diffuser installed and tilted at 45 degrees gives a nice soft wrap around of light with a soft shadow behind the subject This fits cleanly over the head of your existing flash, no need for cumbersome attachments, hooks. It helps to reduce hard background shadows and eliminates the annoying red eye effect.