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O
OBIE LIGHT
Compact light fitting designed to mount just above a film/stills camera lens for two reasons: firstly to create a characteristic glint in the eye of the subject of the photograph/film (it's known as the Eye Light), secondly to flatten out any lines/wrinkles in the face of the subject. The Obie Light is named after the actress Merle Oberon (known to friends as "Obie"). It was first used by her husband, cinematographer Lucien Ballard, in the 1940s to make lines and shadows disappear from her face which were due to scarring following a car accident. The Obie Light is normally heavily diffused.
OFFSTAGE
A movement towards the nearest side of the stage from the center. The area out of sight of the audience
OHM
The unit of electrical resistance.
ONSTAGE
- A movement towards the center of the stage from the sides.
- Stage layout diagram
OPALESCENT
Reflecting an iridescent light; having a colored smooth surface that gives the effect of cloudiness and diffusion due to the intentional presence of fissures, striae, and bubbles.
OPEN WHITE
Lighting with no color filter. Known in the US as NC (no color).
OPTICAL CONTROL
Optical control may be provided in a number of ways. All are applications of one or more of the following phenomena: reflection, refraction, polarization, interference, diffraction, diffusion, and absorption.
OPTICS
The lamp, lens, color, gobo and mirror system that produces a projected image.
OPTO ISOLATOR
An electronic device that electrically isolates two parts of a circuit but allows a signal to pass. A good example is in a dimmer pack where the DMX or 0-10v inputs must not be connected to mains. The Opto Isolator is used to separate the mains and 0-10v parts of the dimmers pack and to transfer a control signal to the triacs over the isolation.
OUTRIGGER
An extendible leg to increase the stability of access equipment (eg Tallescope, Scaffold tower).
OVERLAY
(Followspot term) The wider of two followspot beams covering the same performer.
(i.e. lamp one in a pink 'bust' (head-to-shoulder) and lamp two in a blue full-body overlay (head-to-toe).
Submitted by Bert Morris.
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