Tutorial: Exposure

Perfect Exposure

The digital sensor in your EOS needs just the right amount of exposure to light to capture a perfect image.

This tutorial explains how your EOS measures light and converts these measurements into exposure settings, together with techniques to adjust exposure to capture the image exactly as you would like to see it.

• What is exposure made up of?
• Metering modes
• See the difference in Live View
• Exposure compensation
• Auto Exposure Bracketing (AEB)
• High Dynamic Range (HDR)
• Multiple Exposure

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Red Light, © Richard Craze 2012, Canon EOS 600D

What is exposure made up of?
Three factors affect photographic exposure.
Shutter speed: The length of time that light is allowed to fall on the sensor. It can be a very brief duration, such as 1/4000 second, or a much longer period, such as 30 seconds or more.
Aperture: The size of the hole in the lens through which light passes. A wide lens aperture, such as f/2.8 lets a lot of light through. A small lens aperture, such as f/16, blocks much of the light.
ISO value: The sensitivity of the digital sensor. A low ISO value, such as 100, gives low sensitivity. A high ISO value, such as 12,800, means that the sensor is much more sensitive to light.

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