Can the ExpoDisc be used in conjunction with other filters?
Yes. The ExpoDisc can be used in conjunction with other filters such as polarizing, skylight, ultraviolet, and color balancing filters when you keep the following caution in mind. A color cast can be introduced if: 1) you set a custom white balance with a filter (other than the ExpoDisc) on the lens and then remove the filter; or, 2) you set a custom white balance without a filter on the lens and then add a filter to the lens. Example: If you set a white balance with a Wratten 81A filter on the lens the camera will assume that the source light is too warm and will add blue. As long as the 81A filter is still on the lens the blue that is added by the camera will be negated by the warmth of the filter. If you now remove the filter, the camera will still add the blue but there is no additional warm light to offset, therefore your pictures will have a blue cast. Note: If you want to use a color balancing filter such as a Wratten 81A on your camera to “warm” up your picture, make sure you a
