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C
CONCAVE
Lens shape. Edges are wider than the center of the lens. Useful to remember that "caves" go inward.
CONDENSER LENS
Loosely applied to any spotlight lens which condenses diverging rays into a beambut more correctly to the short focus combination of two or more lenses in a jacket used for illuminating a slide or effect disc. Also used in some profile lanterns and followspots to produce a smoother light (especially for gobo work).
CONDUIT
Metal or plastic pipe used to carry electrical conductors as part of a permanent electrical installation.
CONNECTOR
- Device that allows fast convenient connecting and disconnecting of electrical equipment.
- A plug. A device that allows the fastsafeand convenient connection and disconnection of electrical equipment. There are many types of connectors used for entertainment lighting purposes. Some common types include Camlock for feeder cable and dimming rackspin connector for stage cableand XLR connector for control cable.
CONSOLE
Any theatrical control device capable of storing cues for playback at a later time.
CONTACTOR
A device for repeatedly opening and closing electrical circuits. Electricallyrelays and circuit breakers also fulfill the same function.
CONTROL CABLE
- Cable that carries control single between electrical or electronic equipment.
- A term describing any cable which carries control signals or protocals between electrical or electronic devices. This signal can be as simple as a low voltage analog signal or as complex as a bi-directional digital protocol. Increasinglyperformance electronics are utilizing computer ether-net protocols over thin-netor fiber-optic network cables.
CONTROL CHANNEL
A lighting control concept analogous to a control slider or fader. On manual or preset controllers this may refer to an actual fader or slider. On a computer memory console a channel may only be represented by a number which is assigned by the system to control any number of physical dimmerscolor scrollersor other devices. Generally a control channel represents the smallest easily divisible set of controls a designer has over groups of lighting instruments. A soft patch or pin patch is used to assign dimmers or groups of dimmers to individual control channels.
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