Phot r pop up flash diffuser for canon and nikon white provides a large frosted shield that uses a textured finish to soften the light from your pop up flash the diffuser mounts via a canon or nikon hot shoe and features a rail system for adjusting the height of the shield to your camera 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 the light that passes th