I biked to Millenium Park this afternoon. The place was very crowded. While was taking some photographs I tried stacking two circular polarizers and one linear polarizer in order to cut light so I could take photographs at very slow shutter speed (and blur out the people). I was surprised to see that this combination of polarizers acts almost like an Infra Red filter. The shutter speed had to be slowed down to 30 seconds. I bought a Hoya 72 IR filter earlier today for real Infra Red photography. Until then I will experiment with this polarizer combo.
Infra Red photography is not for everyone. It involves a fair bit of Photoshop editing to balance the colors.
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