Digital Photography 101

Chapter 4: Exposure and how it works

4.4: The relationship between Shutter speed and Aperture

In any type of camera, light is focused by the lens, through an aperture and onto the focal plane. The size of the aperture controls how much light passes. In addition to controlling the brightness of the exposure, the aperture controls the depth of field in the image. By balancing the size of the aperture (as measured in f-stops) with the shutter speed you can trade off between varying depth of field, and or the ability to better-resolve fast motion.

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