Fireworks are one of the most rewarding subjects for long exposure photography, and one of the most frustrating to shoot with a phone. Point your iPhone at the sky in regular photo mode and you usually get a small, blown-out blob of light against a black frame. The burst that looked huge in person becomes a disappointing speck.
The fix is long exposure. Instead of freezing a single instant, you let the shutter gather light over several seconds, so each shell draws its full arc across the frame: launch, burst, and the falling trails. This guide covers where to stand, how to set up, and how to time your shots, whether you're heading out for July 4th or any fireworks show this year.
Why Fireworks Need Long Exposure
A firework is not a single moment. It's a streak of light that unfolds over time. A fast shutter slices out one thin moment of that streak, which is why normal photos of fireworks look sparse and underwhelming.
An exposure lasting a few seconds captures multiple bursts and their complete trails in one image. That's the classic fireworks photo: layered explosions with long, sharp light streaks filling the sky. The same principle behind light trail photography applies here; you're recording the path of a moving light source, not a frozen instant.
There's a catch with the iPhone's default camera, though. It doesn't let you set the shutter speed directly, and it tends to pick a fast shutter on its own. To get real control over exposure time, you need a third-party app.
Where to Stand
Position matters more than any setting. Two things to think about before the show starts:
- Stand far enough back. Fireworks fill more sky than you expect. From a distance, you can frame the full burst plus some skyline or water below it, which gives the photo scale and context. Too close and the bursts overflow the frame.
- Stay upwind. Fireworks produce smoke, and smoke drifts with the wind. If you're downwind, a haze builds up after the first few shells and every later burst looks muddy. Check which way the wind is blowing and put it at your back.
Bonus points if you can find water in the foreground. A river, lake, or harbor doubles every burst with a reflection.
Camera Settings for Fireworks on iPhone
If you're using a long exposure app like Lento, here's how to set up:
- Pick a light-trail style blend mode. Fireworks are bright lights against a dark sky, exactly what Light Trail mode is built for. It uses lighten blending, which keeps the brightest pixels from each frame, so the trails stay crisp instead of fading into an average.
- Keep ISO low. The night sky is dark but the fireworks themselves are intensely bright. A low ISO keeps the bursts from blowing out to pure white and keeps the sky clean. Lento lets you set ISO manually anywhere from 100 to 3200; start at the low end for fireworks.
- Set your exposure to a few seconds. A few seconds is enough to catch one or two complete bursts with full trails. Lento's duration runs from 1 second to unlimited, plus a Bulb mode if you'd rather start and stop the exposure by hand as shells go up.
- Lock focus before the show. Autofocus can hunt in the dark. Use manual focus on something distant (the launch area, a building) and leave it there.
Keeping the Phone Steady
Any camera shake during a long exposure smears the static parts of the frame: the skyline, the crowd, the horizon. A small phone tripod is the easy answer. No tripod? Brace the phone on a railing, a wall, or a bag, and use a timer (Lento has 3s and 10s options) so your tapping finger isn't shaking the phone when the exposure starts.
That said, frame-stacking apps are more forgiving here than traditional cameras. Because Lento captures a continuous 30fps stream and stacks the frames on the GPU, each individual frame is exposed normally, so handheld shots don't fall apart the way a single long exposure would. A tripod still gives the sharpest result, but don't skip a great burst just because you left the tripod at home.
Timing Your Shots
Timing is the part nobody tells you about. Two patterns to know:
Start the exposure at launch, not at the burst. If you wait until the shell explodes, you've missed the rising trail and half the bloom. Watch for the launch streak, start your exposure, and let it run through the burst and the falling sparks. Bulb mode is great for this: open when the shell goes up, close when the sparks fade.
Be careful during the finale. The finale fires many shells at once, and all that overlapping light piles up fast in a long exposure. The frame can wash out to a bright mess. Shorten your exposures during the finale, or embrace it and go for one deliberately wild, overlapping shot.
One advantage of a real-time stacking app: you watch the exposure build on screen as it happens, so you can see when a frame is getting full and stop before it overcooks.
Can You Use the Live Photo Trick for Fireworks?
Sort of. iPhones can convert a Live Photo into a long exposure effect in the Photos app, and it does work on fireworks. But it only uses about 3 seconds of footage, you can't choose when that window starts relative to the burst, and there's no RAW file to rescue blown highlights afterward. We cover that method, and where it falls short, in our full long exposure guide.
For a once-a-year show, you want control over timing, exposure length, and ISO. That's the difference between hoping a burst lands inside Apple's 3-second window and deciding exactly what your frame contains.
After the Show
If you shot in RAW, this is where it pays off. Lento exports 16-bit DNG files with P3 wide color, which gives you far more room to pull back bright bursts and lift shadow detail in an editor than a compressed JPEG would. Fireworks frames almost always benefit from a small highlight recovery pass.
And if you catch the long exposure bug after the show ends, the night sky has more to offer. Check out our guide to night photography with long exposure on iPhone for what to shoot after the smoke clears.
Frequently Asked Questions
Do I need a tripod to photograph fireworks on iPhone?
It helps, but it's not mandatory with a frame-stacking app. Because each frame is exposed normally before stacking, handheld shots hold up reasonably well. For the sharpest skylines and reflections, use a small tripod or brace the phone on something solid.
What's the best exposure time for fireworks?
A few seconds per shot is the sweet spot for catching one or two full bursts with complete trails. Go shorter during the finale, when many shells fire at once and the frame can blow out. Bulb mode lets you match the exposure to each shell by hand.
Can I shoot fireworks with the free version of Lento?
Yes. The free version of Lento includes the Light Trail mode with exposures up to 5 seconds, which is enough to capture a full burst. Pro removes the time limit and adds RAW DNG export, at $9.99 per year or $29.99 once for lifetime access. You'll need an iPhone XR or newer running iOS 18.