Smartphone Camera Settings for Astrophotography: A Step-by-Step Guide

By Colin Foster

Updated November 2026

Smartphone camera settings for astrophotography come down to three things: switching to manual or pro mode, locking focus at infinity, and using long exposures on a steady support. With those set correctly, a modern phone can capture the Milky Way, the Moon and bright star fields that look nothing like a quick snapshot. This guide walks through the settings in the order you should change them.

Prepare the Phone and the Sky

Before touching any setting, get the basics in place. Light pollution matters more than any camera setting, so pick a site away from streetlights and check the Moon phase. A dark sky will do more for your image than any slider.

Shopping for one? See our guide: 5 Best Camera Settings for Astrophotography: Our Picks Compared (2026).

Turn off night mode and HDR if your phone has an automatic night mode you cannot fully control.
Clean the lens with a microfiber cloth. Night shots exaggerate smudges into hazy blobs.
Charge the phone fully, since long exposures and cold weather drain batteries quickly.
Mount the phone on a tripod or any firm surface. Use a timer or a remote shutter so you do not jiggle the phone.

Set Exposure, ISO and Shutter Speed

Switch to the pro or manual mode in your camera app. Most phones let you set shutter speed, ISO and focus separately. For the Milky Way, a useful starting point is a shutter speed of around 10 to 15 seconds and an ISO between 1600 and 3200, depending on how dark the sky is. Longer exposures brighten stars but also smear them if the sky is rotating quickly.

Keep the exposure compensation at zero when you start. If the image looks too dark, raise ISO before you lengthen the shutter, because very long exposures on a phone can introduce noise and star trails. Check the histogram and aim for a mostly dark frame where the sky background is not clipped to pure black.

Lock Focus at Infinity

Autofocus will hunt in the dark and often lock onto nothing useful. Switch to manual focus and move the focus slider until the stars look like the sharpest points of light. On many phones, zooming in on the screen helps you judge sharpness. Once focus is set, lock it, since most camera apps keep focus unless you tap the screen again.

Shoot in RAW and Edit Carefully

Enable RAW capture if your phone supports it. RAW files keep far more detail in the shadows, which is where the faint Milky Way lives. In editing, raise exposure a little, lift shadows, reduce noise moderately and adjust white balance until the sky looks natural. Avoid pushing sliders too far, since heavy noise reduction erases faint stars.

Choosing a White Balance

Auto white balance often turns a night sky orange or green. A setting between 3800K and 4500K usually gives a neutral look, though you should adjust it to the lighting around you.

Common Mistakes

Leaving autofocus on, which produces soft stars.
Using exposures so long that stars trail into streaks.
Shooting JPEG only, then running out of editing room.
Forgetting that a phone lens is small, so the Milky Way will look modest compared with a dedicated camera.
Pressing the shutter by hand on a shaky surface.

Recommended Gear

A small tripod keeps the phone steady through long exposures and is the single most useful accessory for this work.
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A clip-on phone mount lets you fit the phone to a tripod head quickly and adjust the angle toward the sky.
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A red-light headlamp preserves your night vision while you adjust settings in the dark.
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FAQ

What is the best ISO for smartphone night sky photos?

Most phones produce usable results between ISO 1600 and 3200 for the Milky Way. Darker skies allow a lower ISO, while light pollution may require a lower setting to avoid washing out detail.

Why are my stars blurry on my phone?

Autofocus is the usual cause. Switch to manual focus, set it near infinity and lock it before taking the shot.

Do I need an astrophotography app for my phone?

Not always. Many phones have a built-in pro or manual mode that covers what you need. Dedicated apps can add features like star-tracking or timelapse, but the core settings are the same.

Conclusion

Good smartphone astrophotography comes from dark skies, manual focus at infinity and carefully chosen exposure settings. Start with a 10 to 15 second shutter, a moderate ISO and RAW capture, then adjust from there. Practice on a clear night and your results will improve quickly.

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About Colin Foster

Colin Foster is part of our editorial team and reviews and edits our telescopes & stargazing guides, checking product details against manufacturer specifications and owner feedback.

About the author

Colin Foster

Colin Foster writes reviews and buying guides for Astronomy Site.