Photographers’ gobbledygook can be confusing! This photography dictionary will help you find the real significance behind that jargon.
Ultraviolet(UV)
A Band of wavelengths within the electromagnetic spectrum invisible to the human eye which are shorter than the blue end of the spectrum. All films are sensitive to some ultraviolet radiation. It shows as increased haze, particularly in distant views and at high altitudes, and may give a blue cast to a photograph.
Under exposed
A condition in which too little light reaches the film or sensor, producing a thin negative, a dark positive image or a muddy-looking print.
(see Contrast, Neg, Over exposed, Thin & Paper grade)
Under printed & Under development
A reduction in development which is usually caused by a shortened development time or a decrease in the temperature. It results in a loss of density and a reduction in contrast.
(see Contrast & Dev.)
Uprating (up rated)
A technique where the suggested film speed is deliberately exceeded. The photographer sets a higher film speed on the camera, so causing underexposure, which then is balanced by overdevelopment. Also known as "pushing". The opposite, shooting at an ISO rating below that suggested, and underdeveloping, is known as "pulling".
(see Pulled, Pushed & ISO)
USM
USM (Ultra Sonic Motor) is a Canon devised Autofocus SLR lens motor system. USM lenses are usually quicker to focus, more compact, with greater operational simplicity and virtually silent compared to their earlier 'Arc Form Drive'(AFD) cousins. USM lenses only work with the Canon 'EOS' camera system, introduced in 1987.
(see SLR & EOS)
UV filter
Filter which may be used to absorb UV radiation, to reduce its effect.
(see Ultraviolet)
Peter Ashby-Hayter, Bristol, U.K. Bristol Photographer
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