Make stars sweep across sky with these tricks
Ever wondered how to make stars sweep across the sky in photos? Tony Rice gives photographers tips.
Posted — UpdatedYou’ve probably seen photographs of stars in the night sky with what appear to be "light trails." Photographers create these trails depending on which direction the camera is facing: swooping arcs when they take long-exposure photos while the camera is aimed east or west, circles when the camera is aiming north or south.
- A camera capable of taking long exposures of at least 30 seconds (DSLRs are the most flexible here)
- A steady tripod
- Some way to trigger the shutter without touching the camera, like a remote shutter release or timer that takes multiple photos
- Fully charged batteries in both the camera and shutter remote, as the camera will be operating for an hour or more at a time
To take the photo, Christison recommends the following:
- Set the camera to manual mode
- Use the widest aperture (lowest f-stop number) possible on the camera
- Set an ISO of 400 to 800
- Pick a bright star to focus on or use the infinity mark on the lens as a guide (this setting availability varies depending on the camera and lens model)
- Take several test shots until the desired brightness and focus is met. If the image is too bright or grainy, reduce the ISO.
- A small hand towel secured over the camera and lens with a rubber band can help keep dew from creating problems
- Try shooting 30-second exposures one after another for about an hour. A fast memory card in the camera helps minimize the amount of time between shots and prevents gaps in the trails.
Once you get the hang of creating star trails, more creative possibilities open up, including positioning something of interest (buildings, trees, etc.) in the foreground. You can keep objects in the foreground dark for a silhouette effect or manually “paint” the object with light from a flashlight while the photo is being exposed to make it appear in the final image. Paring movement and stillness in a photo can also the stunning. Just don't forget to get out there and enjoy the night sky and be sure to share your images with us.
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