ExpoDisc Pro White Balance Filter Portrait 77mm

ExpoDisc PRO is basically a filter for white balance on digital cameras, but can also be used in video, film and analog applications. By using special prisms, an extremely homogeneous light distribution and a transmission of exactly 18% is achieved. The filter can be used for both object and light measurement. The photographer can already see the improved neutralization of the color temperature on the camera display compared to the automatic white balance. The filter proves to be indispensable not only for subjects or situations in which no gray card can be used. It also speeds up the normal workflow in digital photography.

The principle of operation is simple: the ExpoDisc has a ball-snap system that allows it to be easily attached to a suitable lens, or (for small lens diameters) it can simply be held in front of it. The front looks like a reflector and is designed to ensure that the light is well dispersed before it falls on the rear ground glass. From the subject position, a manual white balance is now performed in the direction of the light source(s). In principle, the user is expected to recognize which light determines the scene, because only this is relevant for the correct white balance. In principle, the photographer always makes a reference exposure with the ExpoDisc filter set in front when the lighting situation changes. With this reference, he either sets all subsequent exposures to neutral or uses it for later batch processing in the image processing program.This way, all exposures of a lighting situation are color corrected at the same time.