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  2. Ellipsoidal reflector spotlight - Wikipedia

    en.wikipedia.org/wiki/Ellipsoidal_reflector...

    Ellipsoidal reflector spot (abbreviated to ERS, or colloquially ellipsoidal or ellipse) is the name for a type of stage lighting instrument, named for the ellipsoidal reflector used to collect and direct the light through a barrel that contains a lens or lens train. The optics of an ERS instrument are roughly similar to those of a 35 mm slide ...

  3. Stage lighting - Wikipedia

    en.wikipedia.org/wiki/Stage_lighting

    A profile is a spot light, but allows for precise focusing. This term is mostly used in the United Kingdom, Australia, and Europe, as profile spots in the United States and Canada are referred to as ERS, ellipsoidals, or just Lekos, from the original Lekolite created by Joseph Levy and Edward Kook, founders of Century Lighting, in 1933. Fresnel

  4. Stage lighting instrument - Wikipedia

    en.wikipedia.org/wiki/Stage_lighting_instrument

    From left to right: Lamp, Ellipsoidal Reflector, Shutter/Iris Assembly, Fixed Lens, Variable Lens. The opening is the gap in the housing from where the beam of light is intended to come. Many fixtures use a lens to help control the beam of light, though some, such as border or cyclorama lights, do not have any lenses or optics other than the ...

  5. Gobo (lighting) - Wikipedia

    en.wikipedia.org/wiki/Gobo_(lighting)

    A gobo is an object placed inside or in front of a light source to control the shape of the emitted light and its shadow. [1][2][3][4][5] For 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). [6] In ...

  6. Ellipsoid - Wikipedia

    en.wikipedia.org/wiki/Ellipsoid

    Ellipsoidal dome; Ellipsoidal coordinates; Elliptical distribution, in statistics; Flattening, also called ellipticity and oblateness, is a measure of the compression of a circle or sphere along a diameter to form an ellipse or an ellipsoid of revolution (spheroid), respectively. Focaloid, a shell bounded by two concentric, confocal ellipsoids

  7. Scoop (theater) - Wikipedia

    en.wikipedia.org/wiki/Scoop_(theater)

    Scoop (theater) In stage lighting, an ellipsoidal reflector floodlight (sometimes known by the acronym ERF which is often pronounced "erf"), better known as a scoop, is a large, simple lighting fixture with a dome-like reflector, large high-wattage lamp and no lens. It consists almost entirely of a lamp in the center of a big curved metal (or ...

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