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O
OPTICS
The lamp, lens, color, gobo and mirror system that produces a projected
image.
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
OPEN WHITE
(o/w) Lighting with no color filter. Known in the US as NC (no color).
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.
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.
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.
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.
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