Star trails with the Big Dipper and two Iridium flare satellite trails, July 12, 2013, taken from Reesor Ranch, SK. This is a stack of 11 images, each 30 seconds with the Canon 5D MkII at ISO 1600 and 24mm lens at f/2. Taken as part of a time-lapse sequence. A faint purple aurora is at right.
The Amazing Sky 