The ExpoDisc 2.0 White Balance Filter (77mm) is a calibrated colored diffusion filter with a bias that forces the digital camera to add precise quantities of red and green color to a neutral balance. The filter is excellent for warming (or balancing) skin tones in indoor or outdoor portraits and scenery. It decreases color temperature; adds healthy skin tone to images shot in open shade or overcast conditions; slightly reduces the bluish cast on overcast days or at high noon; reduces excess blue from flash indoors or in daylight flash-fill; as well as warms sea sky and high altitude shots. The ExpoDisc 2.0 introduces user-selectable warming filters (gels) an improved mounting design and a new lower price. Compatible with standard step-up rings for use with lenses with different diameters.