The Graslon Insight Accessory Amber Flat Lens is an accessory designed exclusively for the Insight flash diffuser, which fits Canon, Nikon, Sony, Metz, Olympus, Pentax, Sigma and many other external flash units for cameras. The diffuser already comes with an interchangeable front lens, but this amber flat lens gives you another, and allows you to warm the flash. The lens' tint gives the flash's light a color temperature matching that of the tungsten lighting often found in banquet halls, ballrooms and similar venues. This helps your flash-lit subject to match the background context for a more natural look. This flat lens makes the flash more direct, compared to the dome lens, and is the one you'll want to have when using the flash as a fill light in no-bounce situations.