How to Photograph the Moon with a Smartphone

The Moon is the easiest object in the night sky to find and, for most people, the hardest to photograph well. You frame it, press the shutter, and end up with a small white disc with no detail at all, or a glowing blob with a strange halo around it. Nothing is broken. Phone cameras are built to expose for a whole scene, and a black sky with one brilliant object in it is the opposite of that. A few changes to how you shoot will get you craters.

Why phone cameras struggle with the Moon

Auto exposure averages the frame. With a mostly black sky, the camera decides the scene is dark and opens up the exposure, which turns the Moon into a featureless white circle. Digital zoom makes it worse. On most phones, zooming in isn't using a longer lens — it's cropping into the middle of the sensor and enlarging what's there. Camera shake, noise and softness all get magnified along with the Moon.

The good news is that the Moon is genuinely bright, far brighter than most people expect. Exposures of a fraction of a second are usually plenty, which means you don't need dark skies, long exposures or specialist gear.

Choose the right night and the right moment

A full moon looks dramatic to the eye but is the hardest phase to photograph. Sunlight hits it straight on, so there are almost no shadows, and the result is flat and harsh. Shoot a few days either side of first quarter or last quarter instead, when the terminator — the line between the lit and unlit parts of the disc — crosses the face of the Moon and craters throw long shadows. That's where the texture lives.

Timing matters as much as phase. When the Moon is low in the sky you're looking through a lot of turbulent air, and heat rising off rooftops and roads makes the image boil and shimmer. Wait until it has climbed reasonably high. Don't shoot through double glazing either; the glass adds distortion and reflections and gains you nothing. A still, cold, clear night generally gives steadier air than a warm, muggy one.

Settings that do the work

If your phone has a Pro, Manual or Expert mode, use it. Set the ISO as low as it will go — 50 or 100 on most handsets — to keep noise down. Then choose a shutter speed somewhere between 1/125 and 1/500 second and adjust while watching the preview. You're aiming for visible grey maria and crater detail, with no large areas blown out to pure white.

Focus manually if you can. Drag the focus slider to the far end, near infinity, then nudge it back slightly and check the preview. Autofocus often hunts when the subject is a small bright disc against black. For white balance, choose the Daylight preset; auto white balance tends to drift on a mostly dark frame and you'll end up with a yellow or blue cast.

If your phone only has auto mode

Tap and hold on the Moon until you see AE/AF Lock appear. Then drag the exposure slider — the small sun icon beside the focus box — downwards in small steps until the bright disc starts showing surface detail. Lock it there, and fire with a timer so you aren't touching the screen as the shot is taken.

Switch three things off: flash, HDR and night mode. Night mode is designed for dim scenes and will try to brighten the sky and stack frames; on a bright Moon it usually produces a smeared, overexposed result.

Keep the phone steady, and treat zoom with respect

A tripod is ideal, but a wall, a wheelie bin, a car roof or a stack of books all work. Resting the phone instead of holding it is the single biggest improvement most people can make.

• Use a tripod, mini tripod or phone clamp if you have one, or brace the phone against something solid.
• Set a 3- or 10-second timer, or use a voice or volume-button shutter, so your hand isn't on the phone at the moment of capture.
• Take a short burst and pick the sharpest frame — the air is rarely still for long.
• Keep your fingers clear of the lens, and remember that cold weather drains phone batteries quickly, so shoot sooner rather than later.

If your phone has a dedicated telephoto lens, often 2x, 3x or 5x, use it and stop there. Beyond the optical limit you're simply cropping, so it's usually better to shoot at the longest optical setting and crop while editing, where you can control the sharpening. If you own binoculars or a small telescope, you can hold the phone's camera up to the eyepiece — the afocal method. Focus the eyepiece first, then move the phone into position. It takes patience, and inexpensive phone-to-eyepiece brackets make it far easier.

Editing: from grey disc to craters

Keep it simple. Crop tight, then work on contrast. Pull the highlights down to recover the brightest areas, lift the shadows slightly to bring out the darker plains, and add a modest amount of clarity or texture. Sharpen gently; oversharpening creates glowing edges that look worse than a little softness.

Colour fringing

At high magnification, atmospheric refraction often leaves a blue or orange rim along one edge of the Moon. Converting to black and white hides it neatly, and for most lunar photographs it looks better anyway. Reducing saturation slightly is another option.

If you have an app that stacks multiple frames, even a handful of exposures averaged together will reduce noise and reveal more detail than any single shot. Take five or ten frames in the field so you have the option later.

A step-by-step checklist

1. Check the phase and aim for a few days either side of quarter.
2. Wait for the Moon to rise well above the horizon and for the air to settle.
3. Brace the phone or mount it on something stable.
4. Switch to Pro mode: low ISO, shutter around 1/125–1/500 second, daylight white balance, manual focus near infinity.
5. Lock exposure and fine-tune it until surface detail appears.
6. Use a timer and take a burst of shots.
7. Crop, adjust contrast, sharpen lightly, and consider black and white.

Practise across a lunar month

Photograph the Moon every few nights for a month and keep a note of the settings you used each time. You'll quickly find your phone's sweet spot, and you'll notice how much the phase changes the character of the shot. A sharp, well-exposed quarter moon taken from a back garden is a genuinely satisfying photograph, and the skills transfer: the same low-ISO, short-exposure, brace-the-phone approach works for bright planets and the brightest stars too.

Photo: Leolo212 / Pixabay