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Circumpolar Star Trails (July 5-6, 2011) (8mm 5DII).jpg
Circumpolar star trails taken from 11:45 pm to 3:30 am, July 5/5, 2011, using 8mm Sigma fish eye lens and Canon 5D MkII camera, for stack of 275 exposures, each 40 seconds at f/4 and ISO 1000. Stacked with Chris Schur's Photoshop Action. There are also noctilucent clouds and aurora in the scene, looking north from home in southern Alberta, latitude +51°.