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How to Photograph Star Trails with a Digital SLR (+ Video!)

A time exposure at Mauna Loa Observatory, lasting a little over an hour, produced star trails as Earth rotated. (Jonathan Kingston/Aurora Select for the New York Times)

 

What are Star Trails?

Simply stated, star trails are the streaks in a photograph left by stars during a time exposure as the Earth rotates.  Objects in the foreground of the photograph remain sharp as they are not moving relative to the camera, while the stars, depending on which cardinal direction the camera is facing, will form concentric circles or streaks in the sky.

Why does Photographing Star Trails require a different technique with a Digital SLR? Continue reading How to Photograph Star Trails with a Digital SLR (+ Video!)