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FFluorescent

The illumination produced from a gas-discharge lamp or tube is called fluorescent light. Electricity to the lamp stimulates the mercury vapor within the lamp creating the emission of electromagnetic radiation which produces the fluorescence. This type of lighting is typically found in office buildings, warehouses and industrial settings. The light produced is “green” or a cooler-than-daylight light balance. Setting a camera’s white balance to Fluorescent will correct for the green cast.

In terms of color temperature, fluorescent light generally falls between 4000 and 5000 degrees Kelvin.

Color Temperature

Light Source

1000-2000 K

      Candlelight

2500-3500 K

      Tungsten Bulb (household variety)

3000-4000 K

      Sunrise/Sunset (clear sky)

4000-5000 K

      Fluorescent Lamps

5000-5500 K

      Electronic Flash

5000-6500 K

      Daylight with Clear Sky (sun overhead)

6500-8000 K

      Moderately Overcast Sky

9000-10000 K

      Shade or Heavily Overcast Sky

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UDMA
Ultra Direct Memory Access. UDMA is a protocol developed by Quantum Corporation in conjunction with Intel that supports burst mode data transfer rates. UDMA rated memory cards are rated faster than non-UDMA memory cards. Find out more.
Upload
Transferring files or other information to the Internet from a computer or to one piece of computer equipment from another.
USB Flash Drive
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UTC (Coordinated Universal Time)
A global time standard used in the Global Positioning System (GPS); when a GPS device is connected to the camera, the UTC time is recorded separately from the time given by the camera's clock.
Unipod
See monopod.
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.
Underexposure
The result of the film or imaging sensor receiving too little light.
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.
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.
USB
Universal Serial Bus. A protocol for transferring data to and from digital devices.