Can a flash be used to stop action?

• A. True
• B. False
• C. Sometimes
• D. Not at all

Answer: (A)

The key idea is that the flash’s light is emitted in a very brief burst, which can freeze motion. When the flash fires, the subject is illuminated for only a fraction of a second, so fast-moving details can be captured sharply even if the shutter is open longer to expose the scene. The shorter the flash duration (often achievable at lower power settings), the more effectively motion is stopped. This is why flashes are widely used for action and sports photography: the momentary light burst creates a sharp, “frozen” image of moving subjects. In practice, you can still balance ambient light with flash to stop action in a variety of lighting conditions.