Standing under a dark sky full of stars is unforgettable, and photographing it is one of the most rewarding challenges in photography. Modern cameras can record far more stars than your eyes can see, including the glowing band of the Milky Way. This lesson introduces night-sky photography: when and where to go, starting settings, how to keep stars sharp, and how to focus in the dark. Night landscapes, the Milky Way, star trails and astro workflows are covered in depth later in the Academy.
What is astro and night-sky photography?
Astrophotography means photographing objects in the night sky: stars, the Milky Way, the Moon, planets and, with specialised equipment, distant galaxies and nebulae. This lesson focuses on the most popular beginner form: wide night-sky images, often with a landscape in the foreground, sometimes called astro-landscapes.
Darkness and timing come first
| Factor | Why it matters | Tips |
|---|---|---|
| Light pollution | City light washes out stars | Travel away from cities; light pollution maps and the Bortle scale (1 = darkest) help |
| Moon phase | A bright Moon washes out faint stars | Plan around the new moon, or after moonset |
| Weather | Clouds, haze and dust hide stars | Check cloud and air quality forecasts |
| Milky Way season and position | The bright core is visible at certain times of year and night | Use a planning app for your location |
Choosing dark locations is covered in light pollution and location planning.
Starting settings
| Setting | Starting point | Why |
|---|---|---|
| Support | Sturdy tripod | Exposures of many seconds |
| Lens | Wide and fast, e.g. 14–24mm at f/2.8 or wider | More sky and more light |
| Aperture | Widest, or slightly stopped down for sharper corners | Collect as much starlight as possible |
| Shutter speed | Usually about 10–25 seconds, depending on focal length | Long enough for light, short enough for sharp stars |
| ISO | Often 1600–6400, depending on camera and sky | Brighten faint stars |
| Format and white balance | RAW; around 3800–4500K as a start | Natural-looking night sky colors |
| Shutter release | Self-timer or remote | Avoid shake |
These settings use the exposure triangle from exposure triangle at its limits. Noise is managed with good exposure and techniques from noise and stability in dark conditions.
Keeping stars as points: the 500 and NPF rules
Because the Earth rotates, stars slowly move across the sky. If the shutter stays open too long, they become short streaks. Two common rules estimate the longest shutter speed for point-like stars:
| 500 rule | NPF rule | |
|---|---|---|
| Formula | 500 ÷ (focal length × crop factor) = seconds | Takes into account aperture, pixel size and focal length |
| Example | 20mm full frame: 500 ÷ 20 = 25 seconds | Usually gives a shorter time than the 500 rule |
| Strength | Easy to remember | More accurate for modern high-resolution sensors |
Tip:The 500 rule comes from the film era, and on today's high-resolution sensors it often allows slight trailing that shows when you zoom in. Many planning apps calculate the NPF rule for you. Use them as starting points and check sharpness at 100% on the camera screen.
Deliberately long exposures that turn stars into circles or lines are covered in star trails.
Focusing on stars
- Switch to manual focus; autofocus usually cannot find stars.
- Use live view and magnify on a bright star or planet, as in manual focus and focus assistance.
- Turn the focus ring slowly until the star becomes the smallest, sharpest point.
- Tape the focus ring gently so it does not move.
- Take a test shot and zoom in to check.
Remember:The infinity mark on many lenses is not exact. Always check focus on a star rather than turning the ring fully to the end.
Safety and respect in the dark
- Scout locations in daylight and know your way back.
- Tell someone where you are going and bring warm clothes, water and a charged phone.
- Use a red torch to protect your night vision and others'.
- Respect private land, parks and other stargazers: avoid shining lights at others.
Warning:Remote night locations bring real risks. Safety is covered in wildlife and remote-location safety.
Common mistakes
- Shooting near cities or under a bright Moon: few visible stars.
- Relying on autofocus or the infinity mark: soft stars.
- Shutter too long for the focal length: trailing stars.
- No foreground interest: the image lacks scale and story.
Where to go next
Experienced night-sky photographers plan around moon phases, weather and the Milky Way's position, scout foregrounds in daylight and return at night. Many combine several frames to reduce noise or blend a separate foreground exposure. These advanced techniques are covered in the long-exposure and night course, including night landscapes, Milky Way and star photography and astrophotography workflow and stacking.
Practical examples
A first Milky Way photo
- Situation
- You drive 90 minutes from the city on a clear night near the new moon.
- What to do
- You use a 20mm f/1.8 lens at f/2, 15 seconds and ISO 3200 on a tripod, with manual focus on a bright star.
- Why it works
- Dark skies, a fast wide lens and a shutter short enough for a high-resolution sensor give bright, sharp stars.
- Result
- A clear Milky Way above a silhouetted desert rock.
Star streaks at 30 seconds
- Situation
- At 30 seconds with a 24mm lens, stars look like short dashes.
- What to do
- You reduce the shutter speed to about 13 seconds based on an NPF calculator and raise ISO slightly.
- Why it works
- The 500 rule allowed too long an exposure for your high-resolution sensor.
- Result
- Round, sharp stars.
Key points
- Night-sky photography needs dark locations, little moonlight and clear weather.
- Start with a tripod, wide fast lens, widest aperture, about 10–25 seconds and ISO 1600–6400, in RAW.
- The 500 rule is a quick estimate; the NPF rule is more accurate for modern sensors.
- Focus manually on a bright star using magnified live view.
- Plan safely and respect places and other people at night.
Frequently asked questions
What settings should I use to photograph stars?
What is the 500 rule?
Why are my stars blurry?
When is the best time to photograph the Milky Way?
Conclusion
Night-sky photography starts with darkness, planning and a few key settings: a wide fast lens, long but controlled exposures, high ISO and careful manual focus. Keep stars sharp with the 500 or NPF rule, add interesting foregrounds and stay safe. Next, you will explore long-exposure photography in daylight and at night.
Finished reading? Track your progress through Types of photography.