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A "Drop in Boomerang" is designed to mount into the color slot of a lighting fixture and provide the operator with several manually selected gels. Most often this accessory is seen in conjunction with the followspot yoke , when a fixture is being used as a small replacement followspot .
Most manufacturers now use field angle to indicate the fixture's spread typically in this series (5°, 10°, 19°, 26°, 36°, 50°, 75°, 90°). Older fixtures are described by the width of the lens x focal length of the instrument. For example, a 6x9 ellipsoidal would have a 6" diameter lens and a focal length of 9".
The field angle of an instrument is the angle of the beam of light where it reaches 10% of the intensity of the center of the beam. Most manufacturers now use field angle to indicate the spread that the fixture has. However, older fixtures are described by the width of the lens x focal length of the instrument. For example, a 6x9 ellipsoidal ...
Objective: The first lens or curved mirror that collects and focuses the incoming light. Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror.
Compact fluorescent lamp with GU24 cap. A GU24 lamp fitting is a bi-pin connector for compact fluorescent lamps (CFL) or LED lamps that uses a bayonet mount–like twist-lock bi-pin connector instead of the Edison screw fitting used on many CFLs, LED lamps and incandescent light bulbs.
Because of the sudden popularity of N scale model railroading around 1966, Bachmann entered the trains market by starting its N scale trains products in June 1968, [4] with cars packaged in white jewel cases. [5] However, problems of initial run led to a retooling the following year. [6] In 1970 Bachmann entered the HO trains market. [7]
A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.
Leica 60 mm Macro-Elmarit-R 1st version – 1972 – outside bayonet lens hood fitting Leica 60 mm Macro-Elmarit-R dn2 version Leica 75 mm f /2.0 Elcan-R code C-341 – extremely rare