Many smartphone owners are convinced that an expensive SLR camera is needed to photograph the night sky, but modern technologies have stepped far forward. Astrophotography It has become accessible to the masses, turning from the domain of professionals into a popular hobby. Your pocket gadget can capture the majesty of the Milky Way if you know exactly what parameters need to be changed in the standard application.
The main obstacle for beginners is often the automatic mode, which tries to “brighten” the frame, turning the stars into noisy dots on a black background. To get a decent result, you need to take control of the exposure into your own hands. In this guide, we'll walk you through the step-by-step process of preparing, setting up, and processing your images so you can be proud of your first shots.
Before heading out into the field, it's worth understanding the physics of how the sensor works in low light. The light from distant stars is so weak that the sensor takes time to accumulate it. That is why long exposure is a key success factor. Without understanding this basic principle, even the most advanced artificial intelligence algorithms will not be able to create a high-quality image.
Necessary equipment and gadget preparation
Filming the starry sky is a process that requires stability. It is physically impossible to hold the device in your hands during an exposure lasting several seconds without blurring the frame. Therefore, the first and most important element of your equipment should be tripod. If you don’t have a special tripod, you can use a bag of sand or rest the phone on a stationary stone, but the risk of movement will remain high.
The second critical aspect is battery charge. Long exposures and screen operation in the dark quickly drain the battery, and cold night weather only speeds up this process. Always take an external battery (power bank) with you so as not to be left with a discharged device far from civilization. Also, do not forget to completely clear the memory, since files in RAW format take up a significant amount of space.
⚠️ Attention: A sudden change in temperature (going out of a warm room into the cold) can cause the lenses to fog up. Place the gadget in a sealed bag before leaving, give it 15-20 minutes to adapt, and only then take it out for shooting.
To remotely start shooting, so as not to touch the screen and not shake the device, a headset with a volume button or a smart watch is ideal. Many manufacturers offer their own remote control applications that allow you to control the shutter release process remotely via Wi-Fi or Bluetooth. This eliminates micro-shakes at the most crucial moment.
☑️ Checklist before going out
Choosing location and shooting time
Even the best camera will not be able to penetrate dense city traffic exposure. Light pollution from street lights and advertising creates a "dome of light" that hides faint stars. To obtain a high-quality result, it is necessary to move at least 30-50 kilometers away from large populated areas. Use specialized light pollution maps available as web services to find a dark place.
The second factor is the phase of the moon. The full Moon lights up the sky so brightly that it obscures the Milky Way and dim stars. The ideal time for shooting is during the new moon or when our satellite has not yet risen (or has already set). Follow the lunar calendar when planning a photo shoot.
It is also important to take into account the time of year and the position of the galactic center. In the northern hemisphere, the core of the Milky Way is best visible during the summer months, when it rises high above the horizon. In winter, our galaxy is less visible, but you can capture bright winter constellations and nebulae, such as Orion.
- 🌑 Use planetarium applications (SkyView, Star Walk) to find the direction to the galactic center.
- 🏙️ Avoid shooting in the direction of large cities, even if you are far from them.
- 🌫️ Check not only the cloudiness, but also the transparency of the atmosphere (visibility).
Setting up the built-in camera and modes
Modern smartphones often have a built-in “Night” or “Astro” mode, which automatically selects the parameters. However, to obtain maximum control, it is better to switch to PRO or Manualmode. Here you can independently set all three pillars of exposure: shutter speed, ISO and focus.
Start with focusing. Autofocus does not work well in the dark and often wanders. Switch the focus to manual mode (Manual Focus) and set the value to infinity (mountain symbol or ∞). On some phone models, for example Samsung Galaxy or Xiaomi, you need to move the slider all the way to the right, but sometimes you need to step back one step from the maximum so that the stars become dots rather than circles.
Shutter Speed is the most important parameter. To photograph stars without tracks (smears from the Earth's rotation), the "rule of 500" applies. Divide 500 by the focal length of your lens (for most smartphones this is approximately 24-28mm equivalent). The result will be about 20-25 seconds. Exceeding this time will result in the stars turning into short dashes.
| Parameter | Recommended value | Impact on frame |
|---|---|---|
| Shutter speed | 15-25 sec | Lighter/Darker, risk of blurring stars |
| ISO | 1600-3200 | Brightness and digital noise level |
| Aperture | Aperture lens | |
| Format | RAW (DNG) | Color depth for processing |
Shoot in RAW (DNG) format to preserve maximum light and color data that is lost when compressed to JPEG.
Use of third-party applications (GCam, etc.)
If the standard camera application does not provide the necessary control or does not work well with noise, it is worth considering installing Google Camera (GCam) ports. These are modified versions of Google's camera phone, adapted for other devices. GCam's HDR+ and Night Sight processing algorithms often outperform stock solutions, making stars brighter and skies clearer. Another powerful tool is the app. They provide an interface similar to professional DSLR cameras, with a real-time histogram. The histogram helps to accurately assess the exposure: if the graph is “pressed” to the left edge, the frame is underexposed, if it is to the right, it is overexposed
Another powerful tool is the application Camera FV-5 or ProCam X. They provide an interface similar to professional DSLR cameras, with a real-time histogram. The histogram helps to accurately assess exposure: if the graph is “pressed” to the left edge, the frame is underexposed, if it is to the right, it is overexposed
For owners of devices with Snapdragon processors, there are special modules that unlock support for the RAW format at the system level. This allows you to write “raw” data directly from the matrix, bypassing aggressive processor noise reduction. However, installation of such modules requires availability root access and can be difficult for an untrained user.
⚠️ Attention: Installing unofficial GCam ports (APK files from unverified sources) carries security risks. Download mods only from trusted resources, such as CelsoAzevedo, and check compatibility with your processor model.
What is stacking in mobile applications?
Some applications, such as NightCap (on iOS) or specialized modes in Android, make a series of 10-50 short frames and automatically stack them. This allows for a significant reduction in digital noise as the random noise is averaged out and the signal (stars) is amplified. This method is often more effective than one long exposure on small sensors.
Shooting technique: step-by-step algorithm
When the equipment is ready and the settings are set, it’s time for the process itself. Place the tripod on a hard surface. If the ground is soft, press the tripod legs deeper or place rocks under them to prevent the structure from wobbling in the wind. Turn on the delay timer for 3-5 seconds or use voice control to give yourself time to remove your hands from the device before releasing the shutter.
Take a test shot with a low ISO setting (such as 400) and a fast shutter speed to check composition and focus. Zoom in on the screen, find a bright star, and make sure it appears as a clear dot rather than a blur. Only after this set the final parameters: ISO 1600-3200 and shutter speed 20 seconds.
During exposure, do not touch the tripod or shine the flashlight towards the lens. Even weak light can blow out the frame. If you are shooting a series of frames to be put together later, try not to change the camera position between shots. To create panoramas of the Milky Way, take a series of vertical frames with an overlap of 30%.
- 📱 Turn off all notifications and put your phone in airplane mode so that a call does not interrupt the shooting.
- 🔦 Use a red flashlight, it has less effect on night vision and does not illuminate the frame as much as white light.
- 🧊 Watch out for condensation on the lens, especially near the sea or in foggy weather.
Basic image processing
The raw file (RAW) always looks paler and more contrasty than a JPEG, but it contains all the necessary information for the magic of post-processing. Applications Snapseed, Lightroom Mobile or Photoshop Expressare great for working on your phone. The first step is always cropping and leveling the horizon, since a littered horizon line in a photo of a starry sky is very noticeable.
Next comes work with exposure and contrast. Raise the exposure a little, but don't overdo it so the sky turns grey. Increase the contrast and blacks to make the background deep and rich. The Clarity or Texture tool will help highlight the structure of clouds or details of the Milky Way.
Color correction is the final stage. The starry sky should not be acid blue or purple. Try to keep the colors natural: cool blues for the sky and warm tones for the stars. Use the “Saturation” tool carefully, it is better to use “Vibrance”, which enhances only dull colors without affecting Optical stabilization (OIS) on many smartphones at shutter speeds longer than 1 second can have the opposite effect, introducing micro-blurs, so in professional astro modes it is often programmed turn off.
Use the Curves feature in Lightroom Mobile to spot lighten only the brightest parts of the Milky Way without affecting the dark sky.
Is it possible to shoot stars with a regular phone without a tripod?
Theoretically, yes, if you use the "c" mode hands" in night photography, which takes many short frames and stitches them together. However, the quality will be significantly lower: the stars may be less clear, and the detail of the Milky Way will be lost. For serious astrophotography, a tripod is a must.
Why is there a lot of colored noise in the photo?
This happens due to the high ISO value and heating of the sensor during prolonged use. To reduce noise, shoot in RAW and apply noise reduction during processing. Shooting at a lower ambient temperature also helps.
Which phone is best for shooting stars?
Flagships with large sensors (1 inch or more) and fast optics (f/1.4 - f/1.8) are best suited. The leaders are often models from Huawei, Xiaomi, Samsung (S Ultra series) and Google Pixel thanks to computational photography algorithms.