A pre-dawn display of noctilucent clouds on the morning of June 23, 2014, two days after solstice. The NLC clouds are low in the northeast, in the twilight, but the entire sky is blue with perpetual twilight. The Big Dipper is at upper left, the Little Dipper and Polaris at top centre. This is a single 10 second exposure at f/2.8 with the 16-35mm lens at 16mm and Canon 6D at ISO 1600.
The Amazing Sky 