Circular star trail photos are pretty easy once you know the basics. First, take your time, you only get one chance. Locate the north star then start looking for a foreground subject that will stand out against the spinning stars, such as trees and rock formations. Set up your tripod and camera, carefully frame your subject, set the focus to infinity and the aperture wide open, attach your cable release, then open the shutter. Close the shutter before sunrise.

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