According to the classic compositional rules of landscape photography, the sky occupies three-fifths of the height above a real or imagined horizon. This creates a significant light intensity difference between the lower and upper parts of the image, which then balances out: thus avoiding a washed-out sky and an underexposed landscape. The gray graduated filters from Cokin: The neutral, more or less dark gray of these filters compensates for harsh lights. The sky is underexposed, making the landscape and architecture appear more vibrant in color and depth. They are essential for summer shots at the sea or in the mountains.