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An ellipsoidal reflector. An adjustable lens tube containing the lens or lens train. Adjusting the tube by pushing it further in or pulling it further out of the unit allows changes to the focus (softness or hardness) of the beam of light projected by the unit. This results from changing the distance between the reflector and the lens train.
An ellipsoidal model describes only the ellipsoid's geometry and a normal gravity field formula to go with it. Commonly an ellipsoidal model is part of a more encompassing geodetic datum. For example, the older ED-50 (European Datum 1950) is based on the Hayford or International Ellipsoid. WGS-84 is peculiar in that the same name is used for ...
Ellipsoid. An ellipsoid is a surface that can be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a surface that may be defined as the zero set of a polynomial of degree two in three variables.
Double refraction in calcite. The systematic exploration of light polarization began during the 17th century. In 1669, Rasmus Bartholin made an observation of double refraction in a calcite crystal and documented it in a published work in 1670. [ 2] Later, in 1690, Huygens identified polarization as a characteristic of light and provided a ...
A Lekolite (often abbreviated to Leko) is a brand of ellipsoidal reflector spotlight (ERS) used in stage lighting which refers to the half- ellipsoidal dome reflector within which the instrument's lamp is housed. Introduced in 1933, [1] it was developed by Joseph Levy and Edward Kook, founders of Century Lighting, which eventually became a part ...
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 ...
The light from the lamp is efficiently gathered by the ellipsoidal reflector and sent forward through the gate, shutters and lens system. [1] A diagram of a Selecon Performance Lighting Pacific Zoomspot. The truncated conical ellipse allows better focusing abilities for the light.
A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis. The parabolic reflector transforms an incoming plane wave ...