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Canon® EOS Digital Rebel XTi/400D Digital Field Guide by Charlotte K. Lowrie

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Glossary

If you're new to the language of digital photography, this list of commonly used terms should be helpful.

A-DEP (Automatic Depth of Field AE)

The camera mode that automatically calculates sufficient depth of field for near and far subjects within the coverage of the nine AF focusing points, such as when several people are sitting at various distances from the camera.

AE

Automatic exposure.

AE lock

Automatic exposure lock. This is a camera control that lets you lock the exposure from a meter reading. After the exposure is locked, the photographer can then recompose the image.

AF lock

Autofocus lock. This is a camera control that locks the focus on a subject and allows you to recompose the image without the focus changing. You can usually activate this feature by pressing the Shutter button halfway down.

Ambient light

The natural or artificial light within a scene. This is also called available light.

Angle of view

The amount or area seen by a lens or viewfinder, measured in degrees. Shorter or wide-angle lenses and zoom settings have a greater angle of view, while longer or telephoto lenses and zoom settings have a narrower angle of view.

Aperture

The lens opening through which light passes. Aperture size is adjusted by opening or closing the diaphragm. Aperture is expressed in f/numbers such as f/8, f/5.6, and so on. See also F-number.

Aperture priority (Av Aperture-priority AE)

A semiautomatic camera mode in which you set the aperture (f-stop), and the camera automatically sets the shutter ...

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