We photographers think we see everything; we're alert and watchful, we record what everyone else misses. But even the most sharp-eyed of us can't see infrared radiation (those unable to leap tall buildings in a single bound, that is). Certain films capture infrared, and it can add an air of menace to a stark architectural picture, spookiness to a shot of a lone figure, or a touch of ethereal romance to an outdoor portrait, with all the trees and grass taking on a heavenly glow.
