Banff Poles

Banff Poles 
Tunnel Mountain Campground, Banff Park, Alberta Canada, 17 Aug 1998 10:40pm
20mm f/4 Nikon lens, 1 hour exposure on E200 Ektachrome processed +2 stops (ISO 800)

While camping trips make great venues for photographing the sky, sometimes it is difficult to get a full view of it. But here is an opening in the canopy, the lodgepole pines framing the pole star. The camera was aimed at Polaris, and the shutter opened for an hour. The flickering campfires and lamps illuminated the boughs of the trees. 

A startrail picture like this is a powerful illustration of the Earth’s motion. The pole star shows almost no motion. The others show longer arcs the further away, but all of them make an equal arc: a one-hour exposure cuts 1/24th of a full circle.

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