Vocabulary
- Shutter speed
- The duration of a photographic exposure.
- Aperture
- The lens opening controlling light passage, expressed with an f-number.
- ISO
- A camera setting affecting image brightness rendering and exposure choices; it does not admit more light through the lens.
- Motion blur
- Blur caused by movement during exposure.
Choose an intention
Decide whether you want moving water, leaves, or a passing subject to appear still or visibly moving. The important question is what the motion contributes to the story. Practice from a stable location away from moving traffic, water edges, and other hazards.
Change exposure duration
A shorter exposure generally reduces motion blur; a longer one records more movement. The exact result depends on subject speed, direction, distance, and framing. There is no single shutter speed that freezes every subject. Compare actual results at the scale you plan to display them.
Understand the other controls
At a given scene brightness and shutter speed, a wider aperture admits more light. Aperture can also affect depth of field. ISO influences the rendering and the exposure choices available; raising it does not replace photons that were never captured. Low-light, high-ISO images may show more visible noise, depending on the exposure and camera.
Adapt to your device
If manual controls are available, try two shutter speeds and note what the camera changes automatically. If using a phone without such controls, compare normal capture with an available motion mode and describe the mode honestly. Computational processing can combine frames, so do not assign an invented exposure method.
Practice
Create or plan a two-picture motion comparison. Record the controls or modes actually used, the desired effect, and what you would change next.
Worked example
One frame shows distinct moving leaves; another records streaks. The comparison explains the exposure choices instead of claiming that one setting works for every breeze.
Check your understanding
Why can the same shutter speed produce different motion effects?
Review answer
Subject speed, direction, distance, framing, and camera movement all influence the appearance of motion.
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