Monday, May 25, 2015

Secret IR Window Reflections

Energy-efficient windows are treated to reflect infrared wavelengths and those reflections can be photographed using an infrared camera. To demonstrate this process, I returned to the Upjohn building on the University of Michigan's East Medical Campus to photograph this curved window wall. The infrared-reflecting windows in this facade act like a giant IR mirror.

The “secret” part revolves around that fact that the IR reflections are not visible in the viewfinder. When I was taking this photo I saw desks and boxes that were pushed up against the window. The IR reflection was only visible when I looked at the back of the camera. My focus point was on one of the mullions.

For this shot, I waited until the sun went behind the clouds and started shooting. Post-processing was done in Photoshop CS5 including the conversion to black and white. I converted to grayscale and then added a slight duotone treatment.

D90 (590nm SuperColor conversion), Nikkor 20mm f/2.8 AFD, f/5.6, +1.67EV, 1/200 sec, ISO 200, handheld.