Thursday, 2 June 2011

Photo Glossary - 03 - Aperture

The aperture is a variable opening in the lens that controls the amount of light that reaches your camera’s sensor in a given time. .  It, in conjunction with the shutter speed and ISO setting, determines the exposure of the photo.  Given a consistent shutter speed and ISO setting a narrow aperture will let in less light and a wide aperture more light.

In addition the aperture affects the amount of the photo that is in focus, called the depth of field.  With a wide aperture only objects close to the focal point will be in focus (shallow depth of field) while with a narrow aperture objects further away from the focal point will be in focus (deep depth of field).

In automatic mode the aperture is controlled by the camera.

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