The Tiffen 4 x 5.65" Blue 2 Soft Edge Graduated Filter is a soft-edged graduated color filter providing a bluish color across the image, giving a cooling effect for your photographs. The graduated filter design keeps a portion of the image neutral, resulting in a more realistic look while allowing for the sky or other bright areas to take on the color of the density. The 2 density provides less of a blue cast than the 3 density filter, but more than the 1 density.