A composite of 233 images, taken with the Canon 5D MkII and 16-35mm lens, at Bow Lake in Banff, showing circumpolar star trails across the sky looking north over Num-Ti-Jah Lodge. Each image was 50 seconds, taken at 1s intervals at ISO 1250 and at f/4. Stacked in Photoshop using Chris Schur’s Photoshop Action.
The Amazing Sky 