UD
Ultra Low dispersion lens, pls refer to ED, LD sections.
Ultra-wide angle lens.
Extra-wide angle lens, usually those with an angle of view greater than 90°. For 35 mm cameras the description usually applies to lenses of shorter focal length than about 24 mm.
Underexposure
A condition in which too little light reaches the film, producing a thin negative, a dark slide, or a muddy-looking print.
Unipod
Also refer as monopod.A one-legged support used to hold the camera steady. Also see "tripod".
UV
The ultra violet ray. This is beyond the visible spectrum i.e. it's invisible electromagnetic radiation of the sunlight. UV lenses is very expensive, only Nikon has a offering in its Nikkor lens line.
Variable-Contrast Paper
Photographic paper that provides different grades of contrast when exposed through special filters.
Variable focus lens.
Lens of which the focal length can be continuously varied between set limits. The lens must be refocused with each change in focal length.
Viewfinder.
Device or system indicating the field of view encompassed by the camera lens. The term is sometimes used as a description of the type of camera that does not use reflex or "straight-through" viewing systems and therefore has to have a separate viewfinder.
Vignetting
Underexposure of image corners produced deliberately by shading or unintentionally by inappropriate equipment, such as unsuitable lens hood or badly designed lens. A common fault of wide-angle lenses, owing to reflection cut-off, etc. of some of the very oblique rays. May be caused in some long-focus lenses by the length of the lens barrel.
Wide-Angle Lens
A lens that has a shorter focal length and a wider field of view (includes more subject area) than a normal lens.Also can explained as a lens whose focal length is shorter than the diagonal of the film frame; in 35mm photography, lenses shorter than 50mm; also referred to as a "short" lens.
WS
Watt per second. For flash mode, the measurement of electrical energy in the flash.
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