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Exposure time

1/100

The exposure time is the time during which the shutter of the camera is open. The light-sensitive medium (sensor, film) is exposed during this period. In photography, it is specified in seconds, e.g. 1/125 or 2s.

Together with the Aperture and the light sensitivity (ISO), the exposure time determines the exposure of the photo. Both - exposure time and aperture - are directly related to each other. If I open the aperture wider, for example, I have to shorten the exposure time in order to achieve the correct exposure.

A long exposure time makes movements appear blurred, e.g. to show water flowing. A short exposure time freezes movement and is often used in sports and animal photography.

There is a risk of camera shake with long exposure times, so the use of a tripod is recommended.

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