Entertainment / Photography Glossary

Apochromatic (APO): The ability to bring all colors of the visible spectrum to a common plane of focus, within close tolerances. It usually refers to a lens with such superior color correction.

Apodization: Lens treatment designed to cut down diffraction fringes that appear around the images bright points of light.

Aquatint: Etching technique allowing control of tonal areas to produce almost unlimited gradations from pale gray to black. Because of this it has also been used in photography as an alternative term . . . View Full Definition

Arc Lamp: Photographic lamp in which light is produced by passing an electric current through two carbon rods.

Archival Permanence Treatments: Various treatments given to prints to make them fade-resistant.

Argentotype: Mid-19th century silver print process, on which the kallitype and sepia paper processes are based.

Aristotype: Early commercial print type made on collodion-chloride or gelatin-chloride paper.

Artificial Daylight: Artificial light having a similar color temperature to daylight.

Artificial Light: All light not originating from a natural source - normally the sun.

Artificial Light Film: Color film balanced for use ion tungsten artificial light, usually 3200 k.

ASA: Original system of rating photographic materials, which was devised by the american standards association. The iso rating system is now used in place of the asa.

Aspect Ratio: Ratio of width to height in photographic prints. The ratio is 2:3 in 35 mm pictures which produces photographs most commonly measuring 3.5 x 5 inches or 4 x 6 inches.

Aspherical Lens: Lens with a curved, non-spherical surface. Used to reduce aberrations and enable a more compact lens size.

Aspherical Surface: Lens surface with more than one radius of curvature, i.e. The surface does not form part of a sphere.

Assembly Printing: Method of printing using image separations. Yellow, magenta, and cyan films are stacked to make a final, full color print.

Assignment: Definite ok to take photos for a specific client with mutual understanding as to the provisions and terms involved.

Astigmatism: Lens aberration making a single point light source impossible to focus as a true point.

ATA: Term used to describe a camera, which supports the electrical interface standard, defined by the pc card association (formerly pcmcia), known as ata (at attachment). This is the mobile compu . . . View Full Definition

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