Wednesday, September 16, 2015

Cambridge in Color: Camera Exposure

  • A photograph's exposure determines how light or dark an image will appear when its been captured by your camera.
  • 3 camera settings determines exposure; aperture, ISO, and shutter speed.
  • These 3 settings are also known as the exposure triangle.
  • You cant control the natural light in your photograph but you can use the exposure triangle to make different combinations of exposure.
  • Aperture means depth of field. It controls the area over which light can pass through your camera lens. Its specified in terms of an f-stop value where the area of the opening increases while the f-stop decreases. Every time the f-stop value halves, the light collecting area quadruples.  
  • ISO speed means image noise. It determines how sensitive the camera is to incoming light.  
  • Shutter speed means motion blur. The faster the shutter speed the less exposure time. When the exposure time doubles, the amount of light entering the camera doubles. For example a shutter speed of 1-30+ seconds is typically used for night shots and low lit pictures on tripods. Which is much different from a shutter speed of 1/1000- 1/4000 which is used to freeze extremely fast and take an up close subject motion.       

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