Used MAC 500

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Date:	Saturday, February 4, 2012 at 4:28:40 AM
Script:	/item_2533

Used Martin

Dichroic - In optics, the term dichroic has two related but distinct meanings. A dichroic material is one which either causes light to be split up into distinct beams of different wavelengths (colours), or, one . Used . in which light rays having different polarizations are absorbed by different amounts.

The original meaning of dichroic (from the Greek dikhroos, two-coloured) refers to any optic. Used . al device which can split a beam of light into two beams with differing wavelengths. Such devices include mirrors and filters, usually treated with optical coatings, which are designed to reflect light over a ...

Achromatic - A lens arrangement designed to decrease chromatic aberration, for example: to set the same focal length for red and blue light at the focal plane. Also, a color having no chroma as in black, white and. Used . grays created by mixing black and white instead of other colors that are made of chromatic pigments.. Used . ...

Analog to Digital Converter - In electronics, an analog-to-digital converter (abbreviated ADC, A/D, or A to D) is a device that converts continuous signals to discrete digital numbers. Typically, an ADC converts a voltage to a di. Used . gital number. The digital to analog converter or DAC performs the reverse operation. . Used .

Fresnel Lens - A Fresnel lens is a type of lens invented by Augustin-Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large size and short focal length without th. Used . e weight and volume of material which would be required in a lens of conventional design.

The Fresnel lens (often pronounced FREZ-nell but usually the original fre-NELL in theatr. Used . ical and motion picture lighting applications) reduces the amount of material required compared to a conventional spherical lens by breaking the lens into a set of concentric annular sections known as Fresnel

Limelight - An early type of stage light in which an intense illumination is created when an oxyhydrogen flame is directed at a cylinder of lime, also called calcium oxide, which can be raised to white incandesce. Used . nce heat without melting to producing brilliant illumination. The limelight effect was discovered early in the nineteenth century by Goldsworthy Gurney. A Scottish engineer, Thomas Drummond. Used . , realized that the light would be useful for surveying and built a working version in 1826. Therefore, the light is sometimes known as the Drummond Light. The Limelights first theatrical use was in 1837 at ...

Used Moving Lights

Moving lights, or intelligent lighting as they are sometimes called, are basically a type of stage lighting that is able to move due to its integrated mechanical elements, which go beyond the moving parts that are found in more traditional, non-moving lighting. Automated lighting such as moving lights is highly valued by stage lighting technicians as through them, it is possible to create highly complex special effects that simply cannot be made using standard, non-moveable lights. It should be noted however, that when it comes to intelligent lighting, the real intelligence lies with the programmer of the show, rather than the lighting equipment or any operator. Moving head lights, also called moving head luminaires, are highly versatile lighting instruments capable of performing multiple lighting functions at once. They have largely superseded the use of multiple non-moving lights to create special effects, which required many lights and a large amount of skill on behalf of the operators. Moving lights are hooked up to a lighting control console and send data to it in one of three ways – through an Ethernet control (a relatively new technology), analogue control (now almost obsolete), or DMX, (which is now the industry standard). So long as they have been properly programmed, the optics of wiggly lights can be altered in many ways, allowing for the “personality” of the lights to be adapted almost instantaneously, depending on the requirements of the operator. Typically, moving lights will be pre-programmed before a production and controlled using simple commands, although some more experience operators may prefer to control them “live”, if they have the experience to do so.