F-Number
Indicates the brightness of the image formed by the lens and controlled by the iris. A smaller f-number means a brighter image.
f-Stop
Indicates the speed of a lens. The smaller the number, the greater the amount of light that passes through the lens, thus allowing for better low light camera performance.
Fiber Optics
Flexible glass fibers used to conduct signals.
Field
One of the two equal parts into which a TV frame is divided.
Field Frequency
Number of fields transmitted per second in a TV system. The NTSC standard is 60.
Field of View
The horizontal or vertical picture size at a given distance from a camera to the subject.
Focal Length
The distance from the centerline of the lens to the camera pick-up device. It determines the size of the image and the angle of the field of view as seen by the camera through the lens.
Foot Candle (FC)
Unit of measurement of the intensity of light. 1 FC = 10 lux
Frame
One complete TV picture.
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