ISO

The ISO scale indicates chemical film sensitivity to light:

ISO 100 – Low sensitivity, good for bright conditions, static scene, wide aperture and slow shutter.

ISO 1600 – High sensitivity, good for low light, dynamic scenes, small aperture and fast shutter.

Digital cameras exhibit similar noise at high grain levels.

This picture was used from google.

iso-triangle

Camera modes:

  • Program mode (P) – Complete control of the ISO, camera will choose the shutter speed and aperture.
  • Shutter speed (S) – Complete control of the shutter, camera will choose the aperture.
  • Aperture priority¬†(A) – Complete control of the aperture, camera will chooses the shutter speed.
  • Manual mode (M) – Complete control of the aperture and shutter speed.
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