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LEP Dictionary Terms

zonal constant
A factor that, when multiplied by the average candlepower emitted by a light source in a specified angular zone, reveals the lumens in the zone.
subscriber loop
That portion of the telecommunications network that runs from a local central telephone to the subscriber premises.
virtual histology
Virtual histology refers to the use of digital technology and computational methods to simulate or recreate histological...
mirror lens
An image-forming system having curved mirrors in place of transparent glass components. Mirror lenses are commonly used for...
candlepower
The luminous intensity of a source of light expressed in candelas.
telephoto magnification
 telephoto lens
A compound lens so constructed that its overall length is equal to or less than its effective focal length.
telephotography
1. A method of photographing distant objects with a lens of long focal length. 2. The reproduction of photographs over a...
inverted telephoto lens
minimum object distance
Minimum object distance, often abbreviated as MOD, refers to the closest distance at which a camera lens or optical system...
reversed telephoto lens
telepresence
The use of head-mounted displays and body-operated remote actuators to control distant machinery. Provides a virtual...
telephoto ratio
In a telephoto lens, the ratio of the overall length to the focal length of the lens. It is generally about 0.8 to 0.9 in...
telephoto power
The ratio between the focal length of a lens having a longer focal length than that of the standard lens used with a camera,...
light-powered telephone
Technology that relies on a highly efficient photodetector that can detect incoming light signals at one frequency and...
beam candlepower
With relation to the equivalent beam candlepower of a searchlight, the candlepower of a bare source that would produce the...
telephotometer
An instrument used to measure the luminance (brightness) of a distant object. The object is viewed through a small...
Cooke objective
A telephoto lens form noted for its lack of distortion.
focal length
The focal length of a lens is the distance between the lens's optical center (or principal point) and the image sensor or...
facsimile machine
A device used to transmit and receive images that have been converted to electrical signals over regular telephone lines; it...
lepton
The generic term describing the class of light particles having no strong interactions.
wide-angle lens
A wide-angle lens is a type of camera lens that has a shorter focal length than a standard or normal lens, allowing it to...
quantum entanglement
Quantum entanglement is a phenomenon in quantum mechanics where two or more particles become correlated to such an extent...
retrofocus lens
Also known as reversed telephoto lens. A lens consisting of an ordinary objective with a negative component near its front...
optical microphone
Laser-powered telephone device for analog communications that employs a vibrating plastic membrane as a transmitter to...
FC connector
The fiber optic connector standard for Nippon Telephone & Telegraph (NTT) installations, developed with Nippon Electric...
telephotometry
The principles and techniques involved in the use of telephotometers to measure atmospheric extinction.

(27 results found)

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