Sunday, March 29, 2009

Exposure.....An Introduction

Most people put their camera in Auto mode and are content with the results. Some people would like to have better looking images. One of the ways to accomplish that is by selecting some or all of the exposure parameters that the camera has available.

The exposure of an image is controlled by three parameters.
  • The size of the lens opening.
  • The length of time the shutter is open.
  • The sensitivity the image sensor is set to, known as ISO

In the first two installments we saw that light is first captured by the lens, controlled by the lens opening or aperture, then the shutter controls how long the light falls on the image sensor.