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Exposure and Understanding the Histogram, Second Edition by Andrew S. Gibson

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The Exposure Triangle

The basics of exposure are quite simple. There are three settings on your camera that affect exposure—ISO, aperture, and shutter speed. Exposure is just a matter of deciding which setting to use for each one.

Image

ISO

ISO is the measure of the camera sensor’s sensitivity to light. One of the advantages of digital cameras, compared to film cameras, is that you have the freedom to change the ISO setting from photo to photo.

For most digital cameras, the lowest ISO setting is either 100 or 200. This setting gives you the best image quality. It is the setting you would use when image quality is a priority. It is what landscape photographers ...

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