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Big Dipper & Arcturus at Waterton Lakes (Aug 30, 2013).jpg
The Big Dipper and Arcturus (at left) over the peaks of Waterton Lakes National Park, Aug 30, 2013. Taken with the 24mm lens at f/2.5 and Canon 5D MkII at ISO 3200 for 30 seconds. A faint aurora adds colour at right, and airglow adds the greenish tint to the sky.