According to the classic composition rules of landscape photography, the sky occupies three-fifths of the height above a real or imagined horizon. This creates a significant light intensity between the lower and upper parts of the image, which then comes back into balance: thus, you eliminate the blurred sky and underexposed landscape. The yellow gradient filters from COKIN are ideal for dramatic storm clouds, high-contrast clouds, or to match the sky to the main color of your subject.