Singh Ray's Gold'nBlue polarizing filter made my day when photographing sunrise along Otter Cliffs in Acadia a few weeks ago. The light was clear, the sky void of clouds, and when dawn broke, there wasn't a whole lot of color to the sunrise. But there was some, and the Gold'nBlue filter enhanced what was there. It's a great filter and very powerful for enhancing colors in reflecting streams, for adding a hint more warmth or coolness to a scene, and for intensifying the cool and warm spectrum of colors.
Using filters like this can be tricky, but you see what you're going to get through the filter, just by holding it up to the scene and rotating it. For film, though, it might be too enhanced if using Velvia or Kodak's VS and you have to take that into consideration when deciding how much to turn the polarizer to enhance your colors.
I chose to use it carefully in this scene. You can see in the first image that the light was not as "sweet" as it can be. By using the filter, I was able to saturate colors a bit more and that helped alot, bringing up the pinks and warmer hues in the light.
I don't use a lot of filters, but there are times like this that the filter saved the morning. After all, getting up at 3:30 to drive there for sunrise ought to be reason enough!
Have a great day, all.