Canon EOS Rebel T4i/650D Digital Field Guide

Glossary

Adobe RGB A common color space often used by printers.

AI Servo Focusing mode A focusing mode that follows the subject’s movement until the shutter button is pressed completely to expose the image.

ambient light Available natural or existing light that is not created by the photographer.

angle of view The amount of area seen through the viewfinder and measured in degrees. For example, telephoto lenses have a narrow angle of view.

aperture The opening in the lens that allows light into the camera.

Aperture-priority AE An exposure mode in which the photographer controls the aperture and the camera controls the shutter to create a proper exposure based on the camera’s metering system.

artificial light Light from a manmade source, such as a light bulb or flash.

aspect ratio The proportional relationship of a shape’s width compared to its height.

Autofocus (AF) Focusing mode in which the camera focuses on the subject using select points.

Automatic Exposure (AE) The camera selects all of the elements for proper exposure or the photographer selects some of them, and the camera selects the rest. For example, in Shutter-priority AE mode, the photographer selects the shutter speed and the camera selects the aperture.

Automatic Exposure Lock A button on the camera that locks the exposure setting so that the photographer can recompose the image, or point the camera in a different direction using the locked exposure.

backlighting When the subject is standing between a light ...