TOOGOO(R) 3 Color Pop-Up Flash Diffuser Cover For Canon Nikon DSLR Camera D3000 D5000 D7000 The diffuser is used to create exposures of even density over the entire surface 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.