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Long exposures are one of the most popular, and stunning forms of photography, because they often embody a sense of motion in a single photograph. What if you combine long exposures (as in, very, very long) with astrophotography? Star trails are one of the most mesmerizing things you can photograph using just about standard equipment. Although the theory is very simple (you simply need to shoot a 30 minute exposure, right?), it is much harder to master in practice.