![]() An alternative abbreviation might be "graphical optical black-out". ![]() Some lighting professionals believe that it is an acronym for "goes before optics" or, less often, "goes between optics". The term can be traced back to the cinema studios of the 1930s. It may be an American slang abbreviation of "go-between", or "go-before" (just as New York's " SoHo" signifies the area "South of Houston Street"). unknown origin, perhaps from go between", the exact derivation of gobo is unclear. The Oxford Dictionary gives three definitions (and others concur): "A dark plate or screen used to shield a lens from light (in a theatre) a partial screen used in front of a spotlight to project a shape shield used to mask a microphone from extraneous noise." Though the Oxford provides a possible "1930s . ![]() In theatrical lighting, however, the term more specifically refers to a device placed in "the gate" or at the "point of focus" between the light source, called a lamp, and the lenses (or other optics). The spacing of the gobo and the lens can be varied to alter the size and focus of the image.Ī gobo is an object placed inside or in front of a light source to control the shape of the emitted light and its shadow.įor studio photography purposes, the term "gobo" has come to refer to any device that casts a shadow, and various pieces of equipment that go in front of a light (such as a gobo arm or gobo head). The insert at lower right shows the pattern this device projects. In a theatrical unit, all three would be in an enclosure to prevent light spillage. Components from right to left are the lamp house, the gobo itself (a grid made of wires), and the focusing lens. A decorative lighting device that projects a gobo.
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