What Is Long Exposure Photography?
Long exposure photography uses slow shutter speeds to capture motion over time. Instead of freezing a moment, you record the path of moving elements — flowing water, drifting clouds, streaking car headlights, or spinning star trails. The result is an image that shows time passing in a single frame, creating effects invisible to the naked eye.
Shutter speeds for long exposure work typically range from half a second to several minutes, depending on your subject and the effect you want. A 2-second exposure smooths a waterfall. A 30-second exposure turns ocean waves into mist. A 20-minute exposure paints star trails across the night sky. The technique transforms ordinary scenes into something extraordinary with nothing more than patience and the right settings.
Essential Gear for Long Exposure Shots
Tripod — Your Most Important Tool
A sturdy tripod is non-negotiable for long exposure photography. Any camera movement during a multi-second exposure ruins the shot with blur. Invest in a tripod rated for at least 1.5 times your camera and lens weight. Carbon fibre tripods offer the best balance of stability and portability, though quality aluminium models work well for tighter budgets. Look for a model with a hook underneath the centre column where you can hang your camera bag for extra stability in windy conditions.
Remote Shutter Release or Timer
Pressing the shutter button by hand introduces vibration. Use a wired or wireless remote release, or set your camera’s built-in 2-second self-timer. For exposures longer than 30 seconds (Bulb mode), a remote with a lock function is essential since you need to hold the shutter open manually.
ND Filters for Daytime Long Exposures
Neutral density (ND) filters reduce the amount of light entering your lens, letting you use slow shutter speeds even in bright conditions. Without an ND filter, a daytime long exposure would produce a completely white, overexposed image. Common strengths include ND8 (3 stops), ND64 (6 stops), and ND1000 (10 stops). A 10-stop ND filter turns a 1/125s exposure into an 8-second exposure — enough to smooth choppy water into glass.
Variable ND filters offer convenience by combining multiple strengths in one filter. Fixed NDs generally deliver better image quality with fewer colour casts. Brands like NiSi, Hoya, and K&F Concept offer reliable options across price ranges available in South Africa.
Camera Settings for Long Exposure Photography
Getting your settings right before the shoot saves frustration. Here is a step-by-step approach that works reliably across camera brands and subjects.
Step 1: Switch to Manual Mode
Set your camera to Manual (M) mode for full control over shutter speed, aperture, and ISO. Aperture Priority mode can work, but Manual gives you the consistency long exposures demand.
Step 2: Set Your Aperture
Use f/8 to f/11 for the sharpest results with most lenses. This sweet spot avoids the softness of wide-open apertures and the diffraction that appears at f/16 and beyond. For landscape long exposures where you want front-to-back sharpness, f/11 is ideal.
Step 3: Drop ISO to Base
Set ISO to your camera’s base value — usually ISO 100 or ISO 200. Lower ISO means less noise and a cleaner image, which matters especially for exposures where sensor heat can introduce noise over time.
Step 4: Choose Your Shutter Speed
This is where the creative decision lives. Use these starting points for common subjects:
- Silky waterfalls: 1–5 seconds
- Misty ocean waves: 15–30 seconds
- Light trails from traffic: 10–30 seconds
- Cloud movement: 30 seconds – 2 minutes
- Star trails: 15–30 minutes (or stacked shorter exposures)
Step 5: Focus Before Attaching the ND Filter
Dark ND filters make autofocus impossible. Focus on your subject first using autofocus, then switch your lens to manual focus so the camera does not try to refocus when you press the shutter. Mark your focus point mentally or use tape on the focus ring to prevent accidental shifts while mounting the filter.
Calculating Exposure Time with ND Filters
When you add an ND filter, you need to recalculate your shutter speed. The formula is straightforward: multiply your base exposure time by the filter factor.
For a 10-stop ND1000 filter, multiply your base shutter speed by 1000. If your correct exposure without the filter is 1/125s, then with the ND1000 your new shutter speed is 1000/125 = 8 seconds. If your base exposure is 1/30s, the filtered exposure becomes roughly 30 seconds.
Free smartphone apps like “ND Filter Calculator” or “Exposure Calculator” make this maths instant in the field. Just enter your base shutter speed and filter strength, and the app returns your new exposure time.
Best Subjects for Long Exposure Photography
Long exposure works best when your scene combines stationary elements with moving ones. The contrast between sharp, static objects and blurred motion is what makes these images compelling.
Waterfalls and Rivers
South Africa offers spectacular locations for waterfall long exposures. The Drakensberg region has dozens of accessible falls, from the 948-metre Tugela Falls to intimate cascades along hiking trails in Royal Natal National Park. The Sabie area in Mpumalanga features several waterfalls within a short drive of each other, including Lisbon Falls, Berlin Falls, and Mac Mac Falls. Use 1–5 second exposures to create that classic silky water effect.
Seascapes and Coastlines
Ocean long exposures turn crashing waves into ethereal mist surrounding rocks and piers. The Cape Town coastline at locations like Llandudno, Camps Bay, and Bloubergstrand provides dramatic rock formations with mountain backdrops. Durban’s piers and uMhlanga’s lighthouse offer man-made structures to anchor your compositions. Exposures of 15–60 seconds work well for coastal scenes.
Light Trails and City Scenes
Urban long exposures capture the energy of city life through streaking headlights and tail lights. Johannesburg’s M1 highway overpasses, Cape Town’s foreshore, and Durban’s Golden Mile all offer elevated vantage points. Shoot during blue hour — the 20–30 minutes after sunset — when the sky retains colour and artificial lights glow warmly. Exposures of 10–30 seconds capture continuous light trails.
Star Trails and Night Sky
For star trails, point your camera toward the south celestial pole (for Southern Hemisphere shooters) to capture concentric circles. Dark-sky locations away from city light pollution work best — the Karoo, Cederberg, and Kgalagadi regions offer some of the darkest skies in Southern Africa. Use a series of 30-second exposures stacked in software like StarStax rather than a single very long exposure, which risks excessive noise.
Common Long Exposure Mistakes and How to Fix Them
Even experienced photographers run into issues with long exposures. Here are the problems you will encounter and their solutions.
Blurry images despite using a tripod: Wind vibration, a flimsy tripod, or mirror slap (on DSLRs) can cause subtle blur. Use mirror lock-up, a remote release, and shield your tripod from wind. Hang your bag from the centre column for extra weight.
Overexposed images: Your exposure is too long or your ND filter is not strong enough. Use a stronger ND filter, reduce your exposure time, or stop down to a smaller aperture like f/16 (accepting some diffraction softening).
Purple or green colour cast: Cheap ND filters introduce colour casts, especially at higher densities. Shoot in RAW format and correct the white balance in post-processing, or invest in higher-quality filters from brands like NiSi or Lee.
Light leaks appearing as bright streaks: Light can enter through the viewfinder on DSLRs during long exposures. Cover the viewfinder with the built-in eyepiece cover or a piece of gaffer tape. Mirrorless cameras do not have this issue.
Hot pixels showing as coloured dots: Long exposures generate sensor heat, producing bright pixels. Enable your camera’s Long Exposure Noise Reduction setting, which takes a dark frame after each exposure and subtracts the noise. Note this doubles your total capture time.
Post-Processing Long Exposure Images
RAW files from long exposures benefit from careful editing. Start with white balance correction — ND filters often shift colour temperature. Adjust exposure if needed, then work on contrast and clarity to bring out the smooth textures in water and clouds.
For star trail stacking, import your sequence into StarStax (free) or Photoshop. Use the “Lighten” blend mode to combine hundreds of frames into a single star trail image. This stacking method produces cleaner results than one ultra-long exposure.
Adobe Lightroom and Capture One both handle long exposure files well. Use the noise reduction sliders carefully — too much smoothing destroys the fine detail in your sharp elements. Apply noise reduction selectively using masking tools to target only the sky or smooth areas while preserving texture in rocks, buildings, and foliage.
Frequently Asked Questions
What shutter speed is considered a long exposure?
Any exposure longer than about 1/4 second is generally considered a long exposure, since hand-holding the camera produces visible blur at these speeds. Most long exposure photography uses shutter speeds between 1 second and several minutes, requiring a tripod for sharp results.
Can I do long exposure photography with a smartphone?
Yes, many modern smartphones support long exposure through built-in night modes or third-party apps like ProCam, Slow Shutter, or the manual mode on Samsung and Huawei phones. Results improve significantly with a phone tripod mount. The iPhone 15 and Samsung S24 series both produce usable long exposures up to about 10 seconds.
Do I need an expensive ND filter for long exposures?
For daytime long exposures, yes — you need an ND filter. However, you do not need the most expensive option. K&F Concept and Hoya Pro ND filters offer good optical quality from R300–R800 in South Africa. For serious landscape work, NiSi and Lee filters deliver superior colour neutrality but cost significantly more.
How do I avoid overexposure during daytime long exposures?
Use an ND filter strong enough for your conditions. Start with a 6-stop (ND64) filter for overcast days and a 10-stop (ND1000) filter for bright sunshine. Combine this with a narrow aperture (f/11–f/16) and base ISO (100). Check your histogram after each shot and adjust accordingly.
What is the difference between a single long exposure and photo stacking?
A single long exposure captures everything in one frame but risks more noise from sensor heat and cannot be adjusted after capture. Photo stacking takes multiple shorter exposures and combines them in software, offering lower noise, more flexibility in post-processing, and the ability to discard frames ruined by vibration or passing cars. Stacking is the preferred method for star trails and exposures exceeding 2–3 minutes.
