Entertainment / Photography Glossary

Acid Hardener: Substance used in acid fixer to help harden the gelatin of the emulsion.

Acid Rinse: Weak acid solution used after development and before fixation. By neutralizing alkaline developer left on the photographic material it arrests development.

Actinic: The ability of light to cause a chemical or physical change in a substance.

Actinometer: Early type of exposure calculator.

Acuity: Subjective term for the visual sharpness of an image.

Acutance: Objective measurement of image sharpness.

Adapter Ring: Circular mount, available in several sizes, enabling accessories such as filters to be used with lenses of different diameters.

Additive Color: See additive printing.

Additive Printing: Color printing method which produces an image by giving three separate exposures, each filtered to one of the three primary color wavelengths, blue, green and red.

Additive Synthesis: Method of producing full-color images by mixing light of the three primary color wavelengths, blue, green and red.

Advanced Photo System (APS): Consumer photography developed by kodak and four other companies - canon, fuji, minolta and nikon . It is based on a new film format and photofinishing technologies.

Aerial Perspective: The distance or depth effect caused by atmospheric haze. Haze creates a large amount of extraneous ultra-violet light to which all photographic emulsions are sensitive.

AF Lock: Stops autofocus operation once the subject is in focus. Useful when shooting a subject outside the focus area in the viewfinder. The photographer should first lock the focus with the subject . . . View Full Definition

AF Sensor: The sensor used to detect focus.

Afocal Lens: Lens attachment that alters the focal length of the camera lens without disturbing the distance between the lens and the film plane.

Aftertreatment: The treatment of negatives and prints to correct certain faults in exposure and development, or to create special effects.

Agitation: Method by which fresh solution is brought into contact with the surface of sensitive materials during photographic processing.

Air Bells: Bubbles of air clinging to the emulsion surface during processing.

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