To focus in the dark, switch to manual focus, open live view, magnify the brightest star you can find, and turn the focus ring until that star shrinks to the smallest, sharpest point. Autofocus can't find contrast in the dark, so manual focus on a star is the dependable method. Here's how to do it every time.
In this guide
Why autofocus fails at night
Autofocus works by detecting contrast, and there's almost none in a dark scene. Point it at the sky and it hunts endlessly, then gives up. The solution isn't a better autofocus; it's taking control yourself.
The live-view star method
Set your lens to manual focus. Turn on live view, point at the brightest star or planet in the sky, and use the magnification button to zoom the display all the way in (not the lens, the on-screen preview). Slowly turn the focus ring back and forth; the star will swell to a bloated blob, then shrink to a tiny crisp point. That smallest point is perfect focus. Stop there.
If your camera has focus peaking, it can help, but the magnified-star method is the most precise. Once set, switch your lens to manual if it isn't already, and avoid bumping the ring.
Lock it down
Lenses drift, and a knocked focus ring ruins the next hour of shooting. Many photographers put a small piece of gaffer tape across the focus ring once it's set. Take a test exposure and zoom into the playback to confirm the stars are pinpoints before you trust it for the night.
When there's a foreground too
If you want a sharp foreground and sharp stars, focus on the stars and use a wide-angle lens at a moderate aperture (around f/4-f/5.6) so depth of field covers the foreground too. For the sharpest possible result, advanced shooters take two frames, one focused on the stars and one on the foreground, then blend them. But for most night scenes, one carefully focused frame is plenty.
Common questions
- How do you focus on stars at night?
- Switch to manual focus, open live view, magnify the on-screen preview on the brightest star, and turn the focus ring until the star is the smallest, sharpest point. Then take a test shot and zoom in to confirm.
- Why won't my camera autofocus in the dark?
- Autofocus relies on contrast, which is nearly absent in dark scenes, so it hunts and fails. Use manual focus on a bright star instead; it's the reliable method for night photography.
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