Entertainment / Photography Glossary

Analyzer: Chart, grid or electronic instrument used to determine correct color filtration when making color prints.

Anamorphic Lens: Lens capable of compressing a wide angle of view into a standard frame.

Anastigmat: Compound lens which has been corrected for the lens aberration 'astigmatism'.

Angle Of Incidence: When light strikes a surface it forms an angle with an imaginary line known as the :normal,' which is perpendicular to the surface. The angle created between the incident ray and the normal . . . View Full Definition

Angle Of View: Is the maximum angle of acceptance of a lens which is capable of producing an image of usable quality on the film.

Angstrom: Unit of measurement used to indicate specific points of wavelengths within the electromagnetic spectrum. Visible light rays occur between 4000 - 7000 å.

Angular Field: The angle subtended at the lens by the diameter of the largest circle within which the lens gives an image of acceptable sharpness and even illumination.

Anhydrous: Dehydrated form of chemical. More concentrated, so that less weight is needed in a formula than the crystalline kind.

ANSI: Speed rating system for photographic materials devised by the american national standards institute.

Anti-Fogging Agent: Constituent of a developer that inhibits or reduces fogging during development.

Antihalation Backing: Dye used on the back of most films capable of absorbing light which passes straight through the emulsion. In this way it reduces the amount of extraneous light that can be reflected from the . . . View Full Definition

Antinous Release: Alternate term for a camera cable release.

Antiscreen Plates: Photographic plates containing dyes that reduce the blue sensitivity. Used unfiltered, they can give results similar to those obtained with yellow filtered orthochromatic plates.

Aperture: Circular hole in the front of the camera lens which controls the amount of light allowed to pass on to the film.

Aperture Priority Camera: Semi-automatic camera on which the photographer sets the aperture and the camera automatically sets the shutter speed.

Aperture Ring: Ring located on the outside of the lens usually behind the focusing ring, which is linked mechanically to the diaphragm to control the size of the aperture.

Aplanat: Lens which has been corrected for spherical aberration.

Apochromat: Lens corrected for chromatic aberration in all three primary colors.

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