Shutter speed

A camera has a little door.

This door lets in light. It can open very fast or very slow.

Fast shots freeze things in place. You can catch a bird in the air.

Slow shots let in more light. This helps in dark places. But slow shots can make things look blurry.

Moving things look like a blur in slow shots. You can even make water look like fog.

If you hold the camera, it might shake. This makes the whole picture look blurry. Use a stand to keep it still.

A camera uses a part called a shutter. The shutter is like a little door. It opens to let light hit the sensor. The sensor is the part that records the image.

Shutter speed is how long that door stays open. We call short times "fast" shutter speeds. We call long times "slow" shutter speeds.

Fast speeds help freeze motion. You can catch a bird in mid-flight. This makes the subject look very sharp.

Slow speeds let in more light. This helps when it is dark. But slow speeds can make things look blurry.

If you move a subject during a slow shot, it leaves a trail. This is called motion blur. You can even make moving water look like white fog.

If you hold the camera by hand, you might shake. This shake can make the whole photo blurry. To fix this, use a tripod. A tripod is a three-legged stand that keeps the camera still.

Shutter speed is a very important part of taking a photograph. It is the amount of time that light hits the film or the digital sensor inside a camera.

This time is also called exposure time. Shutter speed helps control how much light reaches the camera. If too much light enters, the image looks too pale. This is called over-exposure. If too little light enters, the image looks too dark. This is called under-exposure. Getting the right amount of light makes every detail in the scene easy to see.

How shutter speed works depends on how long the shutter stays open. A fast shutter speed means the shutter opens and closes very quickly. A slow shutter speed means the shutter stays open for a longer time.

You can use fast speeds to freeze a moving subject in place. This is great for sports like catching a bird in flight. Slow speeds allow more light to enter the camera. This is helpful when you are in a dark place. However, slow speeds can also make things look blurry if they move.

In the early days of photography, things were not very organized. Shutter speeds were not standardized, which means there were no set rules. People used different sequences like 1/10, 1/25, 1/50, 1/100, 1/250, and 1/500 of a second. Soon, experts created a standard way to choose settings. They used a 2:1 scale for shutter speeds. This means each step either doubles or halves the amount of light. This makes it easier for photographers to balance their settings.

There are many specific speeds used for different jobs. A very fast speed like 1/4000 or 1/8000 of a second can freeze fast objects. This is used for planes or athletes. A speed of 1/60 is a common guide for holding a camera by hand. If you use a slower speed, you might need a tripod to stay still.

A tripod is a three-legged stand that prevents camera shake. Some cameras even have a "Bulb" setting. This keeps the shutter open as long as you hold the button down. Other cameras have a "Time" setting that stays open until you press the button again.

Shutter speed can also be used to make art. You can use a slow speed to create motion blur. This makes moving objects look like they are flowing. For example, running water can look like white fog.

You can also try a technique called a zoom burst. This is when you change the lens zoom during a long exposure. This makes the center look sharp while the edges blur. These tricks help tell a story through a single picture. It turns a simple moment into something much more interesting to look at.

Shutter speed, also known as exposure time, is a fundamental setting in photography. It refers to the specific duration that a camera's film or digital sensor is exposed to light. This happens during the interval when the camera's shutter is open.

The amount of light reaching the recording surface is directly proportional to this time. If the exposure is too long, the image becomes overly pale, a state called over-exposure. Conversely, if the exposure is too short, the image becomes overly dark, known as under-exposure. Achieving a correct exposure ensures all details in a scene remain legible.

Shutter speed functions as one part of a larger system to control light. The total exposure is determined by the interaction between shutter speed, the aperture (or f-stop), and the luminance of the scene. Once the light sensitivity of the sensor is set via ISO, photographers adjust the aperture and shutter speed to balance the light.

For example, doubling the exposure time doubles the light, which subtracts one Exposure Value (EV). Because these settings are linked, adjustments to the aperture must be compensated for by changing the shutter speed to maintain the same exposure level. Multiple combinations of these settings can result in the exact same exposure value.

Beyond controlling light, shutter speed dictates how motion appears in a photograph. Photographers categorize speeds as "fast" for short exposure times and "slow" for long ones. Very fast shutter speeds can freeze a fast-moving subject, such as an athlete or a bird.

In contrast, slow shutter speeds are used to intentionally create motion blur. This can be done by panning the camera to follow a moving object, which blurs the background while keeping the subject relatively sharp.

Extremely long exposures can even capture brief flashes of light that are otherwise invisible to the eye.

In the early history of photography, shutter speeds and apertures were not standardized. Different manufacturers used various sequences, such as 1/10 to 1/500 of a second, and multiple national standards existed for film sensitivity. To solve this inconsistency, a standardized 2:1 scale was eventually adopted. This scale ensures that each increment either doubles or halves the amount of light entering the camera. This standardization allows for a predictable relationship between aperture stops and shutter speed steps. This mathematical consistency is vital for modern photographic accuracy.

When shooting handheld, photographers must choose the slowest possible shutter speed to avoid blur from camera shake. A common rule for 35 mm photographers is to use a shutter speed numerically closest to the lens's focal length. For instance, a 50 mm lens might suggest a speed near 1/50 or 1/60 of a second. For a 200 mm lens, the recommendation is to avoid speeds below 1/200 of a second. To use even slower speeds without blur, photographers use supports like tripods, monopods, or image stabilization technology.

Image stabilization can allow for exposures that are 8 to 16 times longer than usual.

Specialized settings exist for extremely long exposures. The "B" or Bulb setting keeps the shutter open as long as the release button is held down. The "T" or Time setting keeps the shutter open from the first press until the button is pressed again. These are useful in fields like astrophotography.

Photographers also use creative techniques like the "zoom burst." This involves changing the focal length of a zoom lens while the shutter is open. This creates a radial blur that draws the viewer's eye toward the center of the image.

In cinematography, shutter speed is closely tied to the frame rate and the shutter angle. Traditional film cameras use a rotating shutter that is synchronized with the film moving through the gate. For a standard 180-degree shutter angle at 24 frames per second, the exposure time is 1/48 of a second. This relationship is expressed by the formula E = F * S, where E is the shutter speed, F is the frame rate, and S is the shutter angle. While electronic video cameras often allow direct time settings, professional models still allow selection via shutter angle to manage light interference from artificial sources.