In traditional film photography ISO (or ASA) was the indication of how sensitive a film was to light. In digital photography, ISO measures the sensitivity of the image sensor.

  • 100
  • 200
  • 400
  • 800
  • 1600
  • 3200

Higher ISO means the sensor is more sensitive to light which means the image will be brighter - this allows you to use your camera in darker situations. However, high ISO results in grain (noise) that may decrease the quality of an image.

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