Long Exposure

Long exposure is a photography technique that uses a slow shutter speed to keep the shutter open for an extended period. Moving elements blur into soft streaks while stationary objects stay sharp. Water turns silky, clouds stretch across the sky, and car headlights trace lines through a frame.

Common uses

Seascapes and waterfalls gain a smooth, glassy surface when waves blur together over several seconds. Night cityscapes show light trails from traffic. Star fields can record circular trails as the earth rotates, though very long star exposures often use a separate tracking mount.

Long exposure also separates moving subjects from still backgrounds. A person standing still amid a blurred crowd draws attention. Panning with a moving subject can blur the background while keeping the subject relatively sharp, a related but distinct approach to motion blur.

Essential gear

A sturdy tripod prevents camera shake during multi-second exposures. A remote shutter release or built-in timer avoids vibration from pressing the shutter button. In bright daylight, a neutral density filter reduces light so the shutter can stay open longer without overexposing.

Exposure settings

Shutter speed is the primary control: one to thirty seconds is typical for water and clouds, while traffic trails may need five to thirty seconds depending on traffic flow. A low ISO keeps noise down. Aperture choice balances depth of field with exposure time; f/8 to f/11 is common for landscapes.

Bulb mode holds the shutter open as long as the release button stays pressed, useful for exposures beyond the camera's timed range. Wind can still shake a tripod during long exposures, so shielding the setup or waiting for calmer conditions helps.

Frequently Asked Questions

Long exposure is a technique where the camera shutter stays open for an extended period, from about one second to several minutes. Moving elements blur into streaks or soft shapes while fixed objects remain sharp. Common results include silky water, stretched clouds, and light trails from vehicles at night.

A tripod is essential for most long exposures because handholding cannot keep the camera steady for seconds at a time. A remote shutter release or self-timer prevents shake from pressing the button. In daylight, a neutral density filter cuts light so the shutter can stay open long enough without overexposing.

A neutral density filter reduces the amount of light entering the lens without shifting color. It allows slower shutter speeds in bright conditions. A six-stop or ten-stop ND filter is common for daytime water scenes. Stacking filters increases the effect but can add vignetting at wide angles.

For flowing water and clouds, one to thirty seconds often works. Light trails from cars may need five to thirty seconds depending on traffic speed and distance. Test frames help find the right duration. Very long exposures in daylight require strong ND filtration and careful attention to wind shake.

Long exposure blurs all motion in the frame unless the subject stays perfectly still. Panning tracks a moving subject while blurring the background, keeping the subject relatively sharp. Both use slow shutter speeds, but panning requires following the subject during the exposure rather than locking the camera on a tripod.

A low ISO, such as 100 or 200, keeps noise low during long exposures. Higher ISO values brighten the image but add grain, especially in shadows. If the scene is too dark even at low ISO, widening the aperture or adding more exposure time is preferable to raising ISO first.

Bulb mode keeps the shutter open for as long as the shutter release stays engaged. It suits exposures longer than the camera's built-in timed range, which often tops out at thirty seconds. A remote release with a lock button makes bulb exposures easier without holding the button manually.

Wind can shake the tripod and blur stationary elements. Passing cars can vibrate bridges. Light pollution can wash out night skies. Condensation may form on the lens in humid conditions during long night exposures. Checking test frames early catches these problems before the best light passes.