Entertainment / Photography Glossary

Atmospheric Perspective: Alternative term for aerial perspective.

Audiovisual: Materials such as filmstrips, motion pictures and overhead transparencies which use audio backup for visual material.

Autochrome: Early commercial color photography process in which the principles of additive color synthesis were applied.

Autofocus: Device used in certain cameras, projectors and enlargers that focuses the image automatically.

Automatic Aperture: Lens aperture mechanism that stops down to s preset size just as the shutter is fired, afterwards returning to the maximum aperture again for focusing and composing the next image.

Automatic Exposure Control: System of exposure setting in a camera, in which the electric current produced or inhibited by the action of light on a photoelectric cell operates a mechanism that adjusts the aperture and/ . . . View Full Definition

Automatic Iris: Lens diaphragm which is controlled by a mechanism in the camera body coupled to the shutter release.

Automatic Lens: Lens which remains at full aperture whatever working aperture is set, until the shutter is released. This allows optimum focusing, without affecting metering. Also referred to as automatic aperture.

Autowinder: Film wind-on mechanism which moves the film on one frame each time the shutter is released.

AV: See audiovisual.

Available Light: Term applying to light normally occurring in a scene, not supplemented by illumination intended specifically for photography.

Axis Lighting: Light pointed at the subject from a position close to the lens.

Azo Dyes: Compounds forming colors of great strength and purity. Used in camera filters and integral tripack dye-bleach materials.

Back Focus: Distance between the back surface of the lens and the image plane, when the lens is focused at infinity.

Back Printing: Information printed on the back of a picture by the photofinisher. The system standard requires the printing of frame number, film cassette number and processing date automatically on the ba . . . View Full Definition

Back Projection: Projection system often used to create location backgrounds in the studio.

Back-Lighting: Light coming from behind the subject.

Background: Area shown behind the main subject in a picture.

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