Canon® EOS-1Ds Mark III Digital Field Guide

Glossary

AE (Automatic Exposure) lock

Enables the exposure to be locked until the shutter is released, allowing the camera to be reframed without the exposure changing.

AF (Autofocus)

The camera and lens automatically focus on the subject, using one of several choices set by the user, including single or multiple focus points, and single focus lock versus AI focus, where the camera automatically adjusts the focus point as it tracks the subject's movement towards or away from the camera.

AF lock

A camera mode that locks the focus until shutter release, allowing the image to be reframed.

Aperture Priority mode

The mode where the user manually selects the aperture while the camera's computer selects the exposure time.

AV (Aperture Value)

The number that represents how far open the aperture is, and thus how much light is being allowed through the aperture. The lower the number, the wider the aperture is and the more light is being let in. Also denotes Aperture Priority exposure mode on many cameras, including the 1Ds MkIII.

AWB (Automatic White Balance)

The color temperature setting that instructs the camera to automatically choose the proper white balance.

barrel distortion

A lens aberration that causes straight lines to bow outward towards the edges of the image.

bit depth

The number of bits per pixel, which determines how many colors and tones can be captured. The 1Ds Mark III utilizes 14-bit depth.

bokeh

The shape and quality of out-of-focus elements in the image. This is strongly affected by how ...