Earlier this year, it seemed to me as if I needed a circular polarizer for daytime shots. Last week at the 69th IETF meeting in Chicago, I think I proved myself right. Here are two photos of the Aon Center (I’m old enough that it will always be the “Standard Oil Building”) taken seconds apart. The shot on the right used a polarizer, and the reward is a deeper blue in the sky.
(Yeah, I know that neither of the two photos are well-composed. However, the couplet is the best illustration from all the photos that I took because the angle of the shot relative to the sun was in the best possible position for maximum effect of the polarizer.)