I spent two years thinking long exposure was something you needed expensive gear for. A proper ND filter, a cable release, a fancy tripod with a bubble level. Turns out most of that is optional ( except the tripod, you need the tripod ).

Long exposure is just keeping the shutter open longer than normal. That's it. The camera collects light for seconds instead of fractions of a second, and anything moving turns into a smooth blur. Water goes silky. Car lights become streaks. Clouds stretch across the sky like brushstrokes.

What You Actually Need

Not much, honestly:

  • A camera with manual mode ( or shutter priority )
  • A tripod. This is non-negotiable. Handheld at 2 seconds = blurry mess
  • An ND filter ( nice to have, not mandatory for night shoots )
  • Patience ( mandatory )
Forest with soft light
This is what 30 seconds of exposure does to moving clouds. No filter, just time.

Shutter Speed: Start Here

Set your camera to shutter priority ( S or Tv mode ) if you're nervous about full manual. Start at 2 seconds and go from there. For waterfalls and streams, 1-4 seconds gives you that smooth, milky look. For city light trails, 8-15 seconds. For star trails, you're going minutes ( but that's a different game ).

The catch: longer shutter = more light hits the sensor. If you're shooting during the day, 2 seconds will blow out your image completely. That's where ND filters come in. Think of them as sunglasses for your lens. A 6-stop ND filter lets you shoot at f/11 for 4 seconds in broad daylight without overexposing.

At night, you don't need an ND filter. The dark is already doing the work for you. Just close down your aperture ( f/8 to f/11 ), keep ISO low ( 100-200 ), and let the shutter stay open.

The Aperture Trick Nobody Mentions

Most long exposure guides tell you to set f/11 and forget it. That works for landscapes, but it's not the only option. If you want light trails with creamy bokeh in the background, shoot at f/4 or f/2.8. The car headlights become big glowing orbs instead of thin lines.

City lights at night
City at night. Wide open aperture + long shutter = this kind of chaos. ( Love it. )

My typical night settings: f/8, ISO 100, 10-15 seconds on a tripod. If I want more ambient light in the scene, I open up to f/5.6 and shorten the shutter. If I want longer trails, I stop down to f/11 and go 20-30 seconds. There's no single right answer, just the answer that gives you the photo you want.

Avoiding the Common Disasters

Camera shake is enemy number one. Even on a tripod, pressing the shutter button can introduce blur. Use a 2-second timer or a remote shutter release. If your camera has mirror lock-up ( DSLRs ), enable it. The mirror slapping around inside the camera at 1/500s is invisible. At 10 seconds with a tiny vibration at the start? It shows.

Wind is the other problem. A cheap tripod in wind at 15 seconds will give you a slightly soft image. Sandbags on the tripod legs help. Or just shoot on calm nights.

Focus. Autofocus at night is useless. The camera can't find edges in the dark. Switch to manual focus, set it to infinity ( or slightly before infinity for sharper results ), and take a test shot to verify. Zoom into the preview. If it's soft, adjust. Repeat until sharp.

Night sky with stars
Stars at 20 seconds. Any longer and they start trailing. Any wider aperture and the foreground goes soft.

ND Filters: Worth It or Not?

If you only shoot long exposure at night, skip the ND filter. You don't need it. The darkness is your filter.

If you want silky waterfalls in daylight or ghostly clouds over landscapes at 2pm, you need an ND filter. I use a 6-stop circular ND ( about $40 from K&F ) and a 10-stop square filter for extreme situations. The 6-stop handles 90% of what I shoot.

Don't buy the $200 variable ND filters. They create cross-shaped artifacts at higher settings. Fixed-stop filters are cheaper and better. End of rant.

My Go-To Settings

Starting points. Adjust from here:

Night city ( light trails )
  f/8, ISO 100, 10-15s, tripod

Waterfall ( daylight + 6-stop ND )
  f/11, ISO 100, 2-4s, tripod

Coastal ( silky water )
  f/11, ISO 100, 4-8s, tripod

Star trails ( advanced )
  f/2.8, ISO 800, 20s per frame, stack later

Clouds over landscape ( daylight + 10-stop ND )
  f/11, ISO 100, 30-60s, tripod
Nature landscape with soft light
The whole point of long exposure: making something ordinary look like this.

The Weekend That Convinced Me

A few months ago I was stuck in Montevideo on a Saturday with nothing to do. The rambla was empty, it was overcast, and I had my Fuji and a cheap tripod. Figured I'd try some long exposure shots of the water.

First attempt: 4 seconds at f/11, ISO 100. The Río de la Plata turned into a flat grey sheet. Not great. Opened up to f/8 and went 8 seconds. Better. The water smoothed out, the clouds started stretching. 15 seconds and suddenly it looked like a painting.

I shot for two hours. Got maybe 3 keepers out of 40 frames. That ratio is normal for long exposure. You bracket, you experiment, most of it goes in the bin. But the ones that work? They look like nothing else.

Processing Tips

Long exposure RAW files need processing. Straight out of camera they look flat. In darktable ( my go-to ) or Lightroom:

  • Pull up the shadows. Long exposures collect a lot of shadow detail. Use it.
  • Recover highlights. Night shots with light sources almost always clip. Pull the highlight slider down.
  • Add contrast. Flat RAW files need a contrast boost. Clarity or the tone curve, pick one.
  • Noise reduction. Long exposures at high ISO are noisy. If you kept ISO at 100-200, you'll be fine. If you pushed it, apply luminance noise reduction carefully.

That's it. Long exposure isn't complicated. Set up, point, wait, check. The hardest part is standing still for 30 seconds in the cold. Everything else is just settings.