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Understanding Exposure: Virtual Camera

Exposure is the most important part of taking a picture. There are four basic variables of exposure:

• Light Level
• Aperture Size
• Shutter Speed
• Film Speed

If you change one variable, it always changes another. For example, the principle of halving and doubling describes the reciprocal relationship between shutter speed and aperture with a given film speed. For example, if you decrease the aperture by one stop, you half the amount of light coming through the lens in a given amount of time and must therefore double the shutter speed to maintain the same exposure.

You can explore these relationships using the virtual camera. It works like an aperture priority camera where you can choose film speed and aperture size, then it calculates the proper shutter speed. The settings are based on the light level of a clear, sunny day.

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