These days most photography instructors will tell you that the only filter you need is a polarizing filter. That’s true as long as you aren’t shooting film. Since I was shooting black and white film last month, I was experimenting with a slight yellow filter, k2, on the Colorado State capital.
I think my next experiment will be with a red filter. The yellow filter did darken the sky slightly but not enough to notice.
The film I used here, Fuji Acros 100, was more for night photography, but I like the grain size in this shot.