The short answer
Shutter speed, or exposure time, is the duration a camera keeps its shutter open to let light hit the sensor or film. Combined with lens aperture and scene brightness, it determines the total exposure. Mastering it lets you freeze rapid action or blur motion intentionally.
How it works
When you press the shutter release, curtains open inside the body to expose the medium. The light entering the camera is directly proportional to this duration. A setting of 1/500 of a second lets in half as much light as 1/250 of a second. Cameras use a standardized 2:1 scale where each step doubles or halves the light reaching the sensor.
Correct exposure means scene details are clear, avoiding dark shadows and blown-out highlights. Because aperture and shutter speed work together, you can trade one for the other. Opening the aperture by one stop while cutting the exposure time in half yields the exact same exposure.
Exposure time also changes how movement appears in the frame. Fast durations freeze motion, while long durations turn movement into a blur. Speeds range from fractions like 1/1000 second to full seconds, with bulb and time modes for very long exposures.
How to use it
- Handheld blur rule. Match your slowest handheld shutter speed to your lens focal length, such as 1/60 s for a 50 mm lens.
- Freezing fast motion. Use 1/1000 s or faster to capture fast subjects like birds, airplanes, or running athletes.
- Everyday movement. Select 1/500 s or 1/250 s to capture people walking or playing sports without blur.
- Panning technique. Use speeds around 1/60 s to 1/125 s while tracking a moving subject to keep it sharp against a blurred background.
- Landscape sharpness. Use speeds around 1/125 s or a tripod for sharp scenic views.
- Shutter priority mode. Switch your dial to S or Tv to set the exposure time while the camera picks the aperture.
Examples
A sports photographer tracking a runner might select 1/2000 s. This speed freezes all motion, capturing the athlete mid-stride in bright light.
A landscape photographer working near a stream might choose a two second exposure. This turns rushing water into a smooth fog while keeping surrounding rocks sharp.
A street photographer panning with a passing bicycle could set 1/60 s. Tracking the rider turns the background into motion streaks while the cyclist stays relatively sharp.
Common mistakes
- Handshake blur. Choosing a shutter speed slower than your lens focal length without support causes blurry photos.
- Overfreezing. Using an excessively fast speed can make a moving subject look stiff and lifeless.
- Ignoring stabilization. Forgetting that image stabilization lets you shoot at slower handheld speeds.
- Neglecting the tripod. Attempting long exposures handheld instead of using a secure mount.
- Mismatched reciprocity. Failing to adjust the aperture when changing shutter speed, leading to wrong exposure.
Quick checklist
- Check your focal length against the handheld speed rule
- Select shutter priority mode if you want control over motion
- Verify your ISO setting matches the lighting conditions
- Mount the camera on a tripod for slow exposures
- Engage image stabilization if shooting handheld in dim light
- Review test shots for unwanted motion blur or camera shake