The Tiffen 2 x 2" Fog 1/4 Filter simulates the effects of natural fog or mist by creating a soft glow around highlights and lowering the overall contrast of the scene. There can also be a softening effect due to how the light interacts with the subject matter. The 1/4 density provides a greater amount of fog effect than the 1/8, but less than the 1/2, and requires no exposure compensation.