Understanding shutter speed, both slow and fast.

What is shutter speed?

Shutter speed is exactly what it sounds like: It’s the speed at which the shutter of the camera closes. A fast shutter speed creates a shorter exposure — the amount of light the camera takes in — and a slow shutter speed gives the photographer a longer exposure.

Challenges that come with adjusting shutter speed.

When adjusting shutter speed, consider light and motion. If you leave the shutter open a longer amount of time to capture more light, motion will affect the photo — maybe in ways you don’t like.

“The problem is that when the shutter is open longer, anything that moves in the frame during that time gets blurrier,” photographer, writer and teacher Ben Long says of camera shake. “Another problem is when the camera shutter is open for a long time and you move the camera. You can’t help but do that because you’re a living human being.”

A slow shutter speed can help you illuminate a darker scene, as it brings more light through the lens. But with a faster shutter speed, the lens is open for a shorter length of time, so less light enters the lens. That makes low light a challenge and demonstrates the importance of a well-lit scene. Be mindful of this as you shoot or you could end up with very dark photos that miss what you want to capture.

Properly setting your shutter speed is crucial when it comes to not missing the moment, especially with fast-moving subjects.

“A couple months ago, I was photographing cheetahs that were hunting,” animal photographer and New York Times best-selling author Carli Davidson tells us. “You can’t just say, ‘Hey, can you redo that? Can you slow down and do that again because my shutter speed wasn’t fast enough and the image is blurry?’”

Experimentation with shutter speed in advance of a shoot will help to give you a mastery of what you need and when you need it.

How different shutter speeds capture motion.

This shutter speed chart illustrates how different speeds capture motion.

Freezing time with a fast shutter speed.

When you don’t want motion blur — the effect caused by a subject or the camera moving during a long exposure/slow shutter speed shot — you can freeze time with a fast shutter speed.

“Two-year-olds are notorious for never standing still,” Carlson says. “You can set your camera to a higher shutter speed so they’re not blurry when you take that shot.”

But beyond simply avoiding motion blur, fast shutter speed gives photographers the almost magical ability to put a single moment in a time capsule.

“It goes back to your reason for taking the photograph,” photographer and designer Shawn Ingersoll explains. “Are you wanting to capture motion or a split-second in time where something is moving but it doesn’t look like it? Like a rock falling into a pond, so you see that split-second where the water flies up into the air.”

Water, an element that can be as still as a dewdrop or as powerful as a tsunami, showcases how shutter speed can tell two stories.

“If you’re looking at the ocean and it’s twilight, you might want a long exposure of 30 seconds,” Carlson suggests. “That can give you more light so that everything isn’t completely dark. It will smooth out all the waves and give you this really soft, glassy look for the water.”

And yet, that same ocean in a single snapshot at a quick shutter speed may showcase a rippling white cap or the roil of a choppy sea. It’s choices like these that give photographers creative options driven by technical adjustments.

Telling a story or capturing action that goes beyond a single moment is possible with slow shutter speeds. Sometimes, it’s even necessary.

“If I’m out at the race track and there’s a Formula One race car going by at 200 miles an hour,” Long relays “and I shoot it at 1/8000 of a second to perfectly freeze its motion, when I look at the final picture, it looks like a parked car. There’s going to be no sense of the reality of that scene. There’s going to be no sense that it was travelling quickly.

“If, instead, I use a slower shutter speed and time my camera to follow the car as it goes through the frame,” continues Long, “the car is going to have a little bit of blur, but the background is going to be totally smeared — it’s going to look like [the car] was going 200 miles an hour. That’s a creative choice I get to make at the time to impart a greater sense of the true reality in the scene.”

How do you choose a shutter speed?

Ask yourself, “What type of photo do I want to take?” Determining shutter speed is something that requires you to consider the end goal of your photo.

“If you take a waterfall picture at a regular shutter speed, the water freezes and you get all that texture,” Carlson says. “But you’ve also seen pictures of waterfalls where the water is smooth and silky. It’s a cool effect and it’s super easy to do. All you do is make sure that the camera doesn’t move and you shoot with a long shutter speed. All those little details of the water running down will blend together and give you that look.”

Shutter speed gives the photographer the ability to use motion — or to freeze motion — to tell a tale or capture a vibe. Whether you choose to take that split-second snapshot with a short shutter speed or to portray the motion of subjects in a slow shutter speed photo, you’re opening up narrative possibilities. Is it about capturing the moment as is or trying to portray how we perceive the moment? Or even to capture the energy of the moment instead of simply the visual details? Mastering shutter speed puts that power into your hands.

And while technical knowledge is helpful in seeking this mastery, it’s practice that inevitably will build this skill for any photographer.

“You could have academic knowledge of how photography works,” Davidson relays. “But you also need to have the practical knowledge of trying it and practising it all the time to put the two together.”