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Circumpolar Star Trails over Castle Mountain (15mm 7D).jpg
Circumpolar stars trails over Castle Mountain in Banff, Alberta. Taken July 23, 2010 from Castle Cliffs viewpoint on Bow Valley Parkway. A stack of 160 25-second exposures with Canon 15mm lens at f/4 and Canon 7D camera at ISO 640. Taken over 2 hours. Full Moon light provided the illumination.