Shutter speed is your time machine

Shutter speed is simply how long your camera's sensor is exposed to light, measured in fractions of a second. It is the single most powerful control you have over how motion appears in your photographs. A fast shutter speed freezes a moment so briefly that a running child looks suspended in mid-air; a slow one gathers light over time, turning a rushing stream into silk or a city street into ribbons of light. Understanding this one setting transforms your everyday pictures from snapshots into something with feeling.

Freezing the moment: fast shutter speeds

When you want sharpness and stillness, you need speed. For a person walking towards you, 1/250sec is usually enough. Children running? Aim for 1/500sec. A dog shaking itself dry, or a cyclist speeding past, needs 1/1000sec or faster. Birds in flight and splashing waves often demand 1/2000sec. On a bright day this is easy, but British weather being what it is, you may need to raise your ISO to 800 or 1600 to keep that shutter speed high. Use shutter priority mode (often marked Tv or S) and let the camera handle the aperture. Set your drive mode to continuous and gently pan with your subject as you fire a short burst.

Painting with time: slow shutter speeds

Slower speeds are where you get creative. At 1/30sec to 1/60sec you can pan with a passing cyclist or runner, keeping them relatively sharp while the background streaks into blur. Drop to 1/4sec and moving traffic becomes luminous trails; hold for 2 to 4 seconds and the effect is even more dramatic. For water, 1/2sec gives a gentle silkiness to a stream, while 1/15sec retains texture and splash. Always use a tripod for these longer exposures, and consider a neutral density filter if you want slow speeds in daylight. In a city at dusk, a tripod on a bridge over the Thames turns buses into red and white rivers of light.

The handholding rule and when to ignore it

There is a classic guideline: keep your shutter speed at least as fast as one over your focal length. So a 50mm lens on a full-frame camera wants 1/50sec or faster; a 200mm lens wants 1/200sec. On a crop-sensor camera, multiply by 1.5 or 1.6. Modern image stabilisation buys you three to five stops, letting you handhold at 1/10sec or slower with care. Tuck your elbows in, breathe out slowly, and lean against a wall or railing. But remember this is a guideline, not a law. When you deliberately want motion blur, you must break it — and that is when a tripod or a steady surface becomes your best friend.

• 1/1000sec or faster: sport, birds, pets shaking
• 1/500sec: running children, cyclists
• 1/250sec: walking people, gentle movement
• 1/60sec: panning, handheld limits for standard lenses
• 1/15sec to 1/4sec: traffic trails, panning with tripod
• 1/2sec to 4sec: silky water, light trails, tripod essential

Shutter speed for UK weather and locations

Our climate offers wonderful opportunities. Overcast days are perfect for slow shutter work because the soft light lets you use longer exposures without blowing highlights. Head to a wooded gorge in Wales or the Lake District after rain, and use 1/4sec to 2sec for rushing water. Coastal winds are ideal for blurring grasses and waves: try 1/8sec at a place like the Cornish coast or a Norfolk beach. At dusk, city centres come alive — London's South Bank, Manchester's Northern Quarter, or Edinburgh's Royal Mile all reward a 4-second exposure on a tripod. For rain, use 1/500sec to freeze individual droplets against a dark background. For snow, 1/250sec keeps falling flakes crisp; 1/60sec turns them into soft streaks.

Putting it into practice

Next time you are out, try a simple exercise. Pick a busy street or a local park and photograph the same scene at 1/1000sec, 1/250sec, 1/60sec, 1/15sec and 1/4sec. Review the results on your computer, not just the camera screen. You will quickly see which speeds suit which subjects — and you will start to predict the outcome before you press the shutter. Carry a lightweight tripod in your bag, or learn to improvise with a wall or a bench. Most of all, experiment without fear: the best shutter speed is the one that tells the story you want to tell.