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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.