Photo Glossary

Under-development

Reduction in the degree of development. It is usually caused by shortened development time or a decrease in the temperature of the solution. It results in a loss of density and a reduction in image contrast.

Underexposure

A condition in which too little light reaches a photosensitive material.

Unipod

A one-legged support used to hold the camera steady.

Uranium nitrate

Chemical used in toners and developers.

USB

Peripheral connector that allows items such as printers, scanners and digital cameras to be connected and unconnected to the computer.

UV (Ultraviolet)

It is a part of the electromagnetic spectrum from about 400nm down to 1nm. It is invisible to the human eye, but most photographic materials are sensitive to near UV bands down to 250nm. It records as increased haze, particularly in distant views and at high altitudes, and may give a blue cast in color images.

UV Filter

A colourless filter thats used to absorb UV light and reduce haze.