Progressive graduation from the bottom to the top of the filter, same colour & tone than 121. According to the classic rules of landscape layout, the sky occupies 3/5 of the space above the line of horizon, whether real or imaginary. In photography, this is interpreted by major differences in luminosity between the sky and the rest of the image. COKIN Graduated Filters, by reducing the difference, re-balance the luminosity between the upper and lower part of the image. They put an end to disappointment from washed-out skies and underexposedlandscapes. Since the sky and the clouds are changeable and varied, Cokin Graduated Filters invite you to imitate them in your own interpretation of colours.