The Exposure Triangle

Exposure is the process whereby light reaches light-sensitive material to create a latent image (Ang, 2010). For analog cameras, that material is film. For digital cameras, it’s the sensor. Many digital cameras make it easy for users by automatically taking care of how much light makes it to the sensor or film. But even the camera’s computer have to work with the three elements of photographic exposure:

Exposure Triangle

  • ISO – the measure of a digital camera sensor’s sensitivity to light
  • Aperture – the size of the opening in the lens when a picture is taken
  • Shutter Speed – the amount of time that the shutter is open

This manual will be covering each parameter in greater detail in the next parts.