Have you ever used filters?!
Originally Posted by Doremus Scudder
It's not a matter of transmitting or absorbing. It is a matter of scattering the light. The sky is blue simple because whatever is in the sky scatters blue rays more.
Go up on an elevated area such as a really tall building or a mountain and then take a landscape picture with some fine grain film with a deep red filter (3 stops of compensation). Then take the same picture without the filter. You will be able to see a lot more detail with the red filter. Once you filter out the scattered blue light you will get the more direct red light. Now take the picture with the blue filter. Details will be obscured.
I read about red filters cutting through haze but I didn't realize how dramatic the effect was until I tried it for myself. I took the pictures on a clear bright day and you could still see a difference. Try it with a red filter AND a polarizer. It's even more dramatic. Bring a tripod and cable release.
The benefits of a red filter particularly a strong red filter cannot be duplicated with a digital camera or photoshop. It really is one of the unique tools of analog photography.