NSL Photography's™ Glossary of Photographic Terms - U

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UD
Ultra Low dispersion lens, pls refer to ED, LD sections.

Ultra-wide angle lens
Extra wide angle lens are 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, dark slide, dark image, or muddy-looking print.

Unipod (Monopod)
A one-legged support used to hold the camera steady.

UV
The ultra violet light. This is beyond the visible spectrum i.e. it's invisible electromagnetic radiation of the sunlight.

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