If you're a space geek like me, you know that this has been a great season. Not only did we get to witness the extraordinary transit of Venus across the sun in June,Carry Your Camera on Any Strap but we also enjoyed a spectacular annular solar eclipse in May. And more recently, NASA announced that one of the Voyager probes has finally left the solar system for interstellar space.
Such events turn my attention to astrophotography. Some time ago, I told you how to shoot the moon, and I've also explained the basics of shooting star trails by using very long exposures. This week, I'll focus on shooting star trails by taking lots of relatively short exposures and then combining the results.You have a lot of ways to capture the beauty of the night sky with a camera, but shooting star trails is among the easiest, mainly because you can do it with almost any camera.
To take a star-trail photo like this one, all you need is a camera with a manual exposure mode; such a camera will let you dial in the shutter speed and aperture setting independently. To make things easier, you'll want either a remote shutter release that you can lock (so that the camera takes photo after photo with no intervention from you) or an "intervalometer" mode, in which you can schedule the camera to take a set of photos automatically. Check your camera's menu or user guide to see whether it has such a mode.
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