Crepuscular Ray Evening

Crepuscular rays emanate upward from behind the western horizon around 7:30 PM, Saturday, September 22, 2012 as seen from the grounds at Noelridge Christian Church in Cedar Rapids, Iowa. Sunset was at 7:03 PM. Clouds near the horizon can block sunlight from reflecting off air, making columns outward from the sun appear unusually dark. These images are 1/4-second exposures at f/10, 320 ISO and 18mm focal length.