Tutorial: Creative exposure

Taking control of exposure

Using your EOS camera in the Basic Zone modes, such as Landscape, Portrait or Full Auto (green square), is straightforward.

You select the appropriate mode, choose the composition of your photo, focus, press the shutter button and leave the camera to select the exposure settings.

This tutorial shows how to go beyond the Basic Zone and explores the Creative Modes on your EOS so that you can use the elements of exposure to influence your photos. It covers:

• The Exposure Triangle
• Selecting the lens aperture
• Selecting the shutter speed
• Selecting the ISO value
• Going manual

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Llyn Idwal, © Beverly Cash 2011, Canon EOS 5D Mark II

The three factors that make up exposure, shutter speed, aperture and ISO value can make a major difference to your photographs. The aperture restricts the amount of light that passes through the camera lens. The shutter speed determines the length of time this light has to create the image. The ISO value determines how sensitive the sensor is to light. None of these factors may sound like a creative control, but each can change the appearance of your images.

It is convenient to think of these factors as three sides of the Exposure Triangle. Change the value of one factor and you will need to adjust one or both of the others to maintain the same exposure.

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The Exposure Triangle

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