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- Ultraviolet Photography
- Refers to taking pictures in invisible ultraviolet rays (wavelengths shorter than 400mm). For ultraviolet photography, a special lens, such a UV-NIKKOR, is required.
- Underexposure
- The result of the film or sensor receiving too little light.
- Unipod
- See monopod.
- Upload
- Transferring files or other information to the Internet from a computer or to one piece of computer equipment from another.
- USB
- Universal Serial Bus. A protocol for transferring data to and from digital devices.
- UV Filter
- A filter that eliminates invisible ultraviolet light, rendering pictures with higher contrast. This filter can be left on the lens as a lens protector.
- UV-NIKKOR Lens
- A lens specially designed for ultraviolet photography, it employs an optical material that transmits ultraviolet rays. Can also be used for visible-light photography.