Long Exposure Photography: Silky Water, Light Trails, and Star Trails

Essential Gear for Long Exposure

• Sturdy tripod — absolutely essential. Any movement during the exposure ruins the image. Invest in a tripod that won’t shift in wind or on uneven terrain.
• Remote shutter release — pressing the shutter button by hand introduces vibration. A wired or wireless remote — or your camera’s self-timer — eliminates this.
• ND filters — neutral density filters are essential for long exposures in daylight. A 6-stop ND lets you shoot 3-second exposures in bright sun. A 10-stop ND opens up 30 seconds or more.
• Intervalometer — for star trails and time-lapse work, an intervalometer allows you to programme a sequence of exposures automatically.

Camera Settings for Long Exposure

• ISO 100 — always the lowest base ISO for maximum image quality and minimum noise over long exposures.
• Aperture f/8–f/11 — for landscapes and cityscapes. Use f/22 if you need an extremely long exposure without an ND filter, but be aware diffraction will soften fine detail.
• Bulb mode — for exposures longer than 30 seconds, switch to Bulb mode and use a remote to hold the shutter open for any duration you choose.
• Disable image stabilisation — optical IS looks for movement to compensate. On a tripod, it can actually introduce micro-movement. Turn it off.
• Shoot RAW — long exposures in difficult light produce challenging files that need careful editing. RAW gives you the latitude to recover them properly.

Silky Water: Waterfalls and Seascapes

Moving water is the most popular subject for long exposure photography. A shutter speed of 1/4 to 2 seconds produces soft, silky movement in waterfalls and streams while retaining some sense of the water’s power. Longer exposures — 5 to 30 seconds — flatten ocean waves into a smooth, ethereal mist that makes rocks and coastlines appear to float. Experiment with exposure length to find the aesthetic that matches the mood you want to convey: more texture and movement at shorter exposures, more abstraction at longer ones. For the full approach to shooting coastal and wilderness landscapes with intent, the Landscape Photography 101 guide is the ideal companion for in-field composition and settings.

Light Trails: Cities After Dark

Vehicle headlights and taillights during a long exposure produce the iconic red and white light trails that define urban long exposure photography. Find an elevated vantage point above a busy road or intersection. Set your exposure to between 10 and 30 seconds — long enough for multiple vehicles to pass through the frame. Frame the composition so the trails lead the eye through the image, curving around a corner or converging toward a vanishing point. Blue hour is ideal: the ambient sky light is still present and balances beautifully against the artificial trail colours.

Star Trails: Writing with the Night Sky

As the Earth rotates, stars appear to move across the sky — and a camera left open for long enough will trace those paths as sweeping arcs. Star trail photography requires a dark sky location away from city light pollution, clear skies, and a willingness to be patient in the cold. The two main approaches are a single very long exposure (15–30 minutes) or stacking many shorter exposures (25–30 seconds each) using software like Sequator or StarStaX. The stacking method reduces noise significantly and gives you more editing flexibility. For the full approach to processing these files in Lightroom — from import through to final export — the Post-Processing Workflow guide walks through every step. Point toward Polaris (the North Star) for circular, rotating trails; shoot away from it for longer, more directional arcs.

💡 Pro Tip: Use your camera’s Long Exposure Noise Reduction (LENR) feature for single exposures over 30 seconds. The camera takes a second “dark frame” exposure with the shutter closed immediately after your shot and subtracts hot pixels automatically. Be aware it doubles your shooting time — a 2-minute exposure takes 4 minutes total.

A Timeless Lens Perspective

Long exposure photography is a meditation on time. It asks you to choose a duration — to decide how much of the world’s movement to include in a single frame — and to sit with that decision while the shutter counts. In a photographic world obsessed with speed and instant reaction, there is something deeply satisfying about making an image that requires you to wait. The result is a photograph that could not have been made any other way, of a moment that does not exist outside of the camera’s patient eye.