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Aurora over Pyramid Mountain.jpg
An aurora display appears to the right of Pyramid Mountain and over Pyramid Lake, in Jasper National Park, Alberta on Oct 24/25, 2015. This is one frame from a 600-frame time-lapse sequence. Exposure was 15 seconds at f/4 and ISO 800 in the bright moonlight, with the Nikon D750 and 24mm Sigma lens.