A Gobo (derived from Go 9L0-509 Between or Goes Before Optics) is a thin piece of metal, wood, or glass used to used to modify the shape of the projected light. It is generally used with Ellipsoidal Reflector Spots, which normally provide a specific slot for gobo use. Old soda cans make a cheap replacement for custom made metal gobos, but don't last as long as professionally made gobos.
Plastic gobos—which are generally custom made—are available when a pattern is needed in color and glass does not suffice. However, these thin plastic films generally need to be used with special cooling elements to prevent melting them. A lapse in the cooling apparatus, even for just a few seconds, can 9L0-402 cause an expensive gobo to be ruined.
Glass gobos can become very complex, and can make use of coloring, much like a stained glass window.
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