The Digital Warm Balance Filter 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 portrait-based ExpoDisc was designed to effectively deliver a custom white balance reading with your flash system of choice: with the disc in place, simply base your white balance customization upon an exposure using your flash system.
The ExpoDisc can effectively be used with step-up rings, so if you use lenses with varying filter size specifications you can buy one ExpoDisc for your largest lens and appropriate step-up rings for your smaller-diameter lenses