I find that I use these filters more and more with car commercials and on feature films where it is not so much about getting a bold blue polarized sky, but to cut through the reflections in windows so that you can see the actor in the car and vice versa. This is particularly useful when you have a stuntman in the car and you do not want to see him. You can use the polarizer to make the reflection more intense. I also use them to darken roads, intensify colors, especially greens. It dials the sky reflection out of the leaves and saturates them.