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These filters have a transparency which increases gradually from the center to the edges of the filter where it reaches full transparency.
Graduated Center Filters have been designed to compensate transparency that reaches to the edge.
When working with ultra-wide-angle lenses, the falloff of illumination towards the corners is sometimes disturbing.
Use of Center Filters in combination with the Schneider Super-Angulon can open new areas of wide-angle photography in black-and-white and color.