How to Safely Capture a Solar Eclipse with Your Smartphone

Solar eclipses are rare, awe‑inspiring events that attract photographers of every level. In 2026 a partial eclipse will be visible across Croatia, offering a perfect chance for enthusiasts to record the phenomenon using only a mobile phone. While modern smartphones have impressive sensors and computational photography capabilities, photographing an eclipse without proper precautions can damage both your eyes and the device. This guide walks you through everything you need to know—from safety basics to equipment, camera settings, and post‑processing—so you can produce a striking, safe record of the celestial show.

Why Safety Comes First

Looking directly at the Sun, even for a few seconds, can cause permanent retinal injury. Ordinary sunglasses do not provide sufficient protection because they are not designed to filter the intense ultraviolet and infrared radiation emitted during an eclipse. The same principle applies to your phone’s camera lens: the optics concentrate sunlight onto a tiny sensor area, and without a proper solar filter the sensor can overheat, leading to burned‑out photodiodes or permanent “dead pixels.”

To avoid these risks, always use a certified solar filter that complies with the ISO 12312‑2 standard. These filters are specifically engineered to block harmful wavelengths while allowing enough visible light to capture a clear image of the Sun’s disk.

Essential Equipment and DIY Filters

Professional solar filters are available for a modest price, but you can also create an effective filter from a pair of certified eclipse glasses. Follow these steps to assemble a reliable DIY filter for your phone:

• Find a pair of ISO‑certified eclipse glasses.
• Use a sharp utility knife to carefully cut a small square of the darkened lens material—about the size of your phone’s camera aperture.
• Secure the cut piece over the camera lens with clear, non‑reflective adhesive tape. Ensure there are no gaps or tears; even a tiny opening can let harmful rays through.
• Test the filter by pointing the phone at a bright indoor light source. The image should appear dim and evenly illuminated, never a bright spot.

Beyond the filter, a stable tripod is indispensable, especially if you plan to use the phone’s zoom function. A tripod frees your hands, reduces camera shake, and enables smoother framing. For the final shutter, a remote trigger—either a wired cable release with a few‑second timer or a Bluetooth remote—prevents any movement caused by pressing the on‑screen button.

Optimizing Camera Settings for the Eclipse

Automatic modes on most smartphones will treat the Sun as an overexposed light source, resulting in a blown‑out white circle. Switching to manual (often labeled “Pro” or “Manual”) mode gives you full control over exposure, focus, and ISO.

Follow this checklist to set up the camera:

1. Focus and Exposure Lock: Tap and hold on the Sun on the screen until a focus lock indicator appears. This prevents the camera from refocusing during the eclipse.
2. Reduce Exposure: Slide the exposure compensation down (usually a vertical bar) until the Sun’s disk becomes sharply defined. You may need to lower it by several stops.
3. ISO: Set a low ISO, ideally between 100 and 200, to keep sensor noise to a minimum.
4. Shutter Speed: Choose a fast shutter—around 1/1000 s or higher—to freeze the Sun’s movement and avoid glare.
5. Zoom: Use optical zoom if your device offers it; digital zoom degrades image quality and can introduce artifacts.
6. File Format: Capture in RAW (or the highest‑quality format available) rather than JPEG. RAW preserves the full spectrum of sensor data, giving you flexibility during editing.

When the eclipse reaches its maximum, the Sun will appear as a thin crescent or a small bright spot. Keep an eye on the live view and adjust exposure incrementally if the brightness changes suddenly.

Tips for Shooting and Post‑Processing

Even with perfect settings, the final image may need refinement. Here are practical steps to enhance your eclipse photo after capture:

• Convert RAW to a Editable Format: Use a mobile app such as Snapseed, Lightroom Mobile, or a desktop program like Adobe Lightroom to open the RAW file.
• Adjust Levels and Curves: Increase contrast slightly to bring out the solar limb and reduce any residual haze.
• Apply Noise Reduction: Low ISO values keep noise low, but a modest amount of noise reduction can smooth out any remaining grain.
• Sharpen the Image: A subtle sharpening filter emphasizes the delicate details of the Sun’s corona or the surrounding landscape.
• Crop for Composition: A tighter crop can focus attention on the eclipse, while including some foreground (e.g., a silhouette of a tree) adds context.

Remember to keep the original RAW file untouched; you can always return to it for further tweaks.

Common Mistakes and How to Avoid Them

Many beginners encounter the same pitfalls when photographing an eclipse. Recognizing them early helps you stay on track:

• Missing the Filter: Never point the phone at the Sun without a solar filter. Even a few seconds of unfiltered exposure can damage the sensor.
• Using Digital Zoom: Digital zoom merely enlarges pixels, reducing clarity. Opt for optical zoom or physically move closer if safe.
• Over‑relying on Auto Mode: Automatic exposure will invariably over‑expose the Sun, producing a washed‑out image.
• Hand‑Held Shooting: Even slight tremors blur the final photo. A tripod and remote trigger are essential for sharp results.
• Neglecting White‑Balance: Set white balance to “daylight” or “sunny” to maintain natural colours; many apps let you fine‑tune it later.

Conclusion

Capturing a solar eclipse with a smartphone is entirely feasible when you prioritize safety and follow a disciplined workflow. By obtaining a certified solar filter, stabilizing your device on a tripod, manually configuring focus, exposure, ISO, and shutter speed, and finally polishing the RAW image in post‑processing, you can create a memorable record of the celestial event without risking your eyesight or your phone’s sensor. Prepare your equipment ahead of time, rehearse the settings, and enjoy the awe of watching the Moon briefly veil the Sun—knowing you’ll have a beautiful, safe photograph to share for years to come.