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A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
Fresnel lenses can be placed close to the light source and are inexpensive to produce. In film lighting lenses range in size from 2 to 24 inches, and lamp power between 150 W and 24,000 W. Fresnels use a spherical reflector, with the filament of the lamp at its focus point. This effectively doubles the light delivered by the fixture, as all ...
Colour frames are placed directly outside the fixture, immediately in front of lens assembly. Most fixtures include an integrated holder for the frame. Some accessories designed to mount in the gel frame holder, such as Barn Doors, occasionally include an integrated replacement slot for frames.
Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, an electrical ballast or power supply, and a shade to diffuse the light or direct it towards a workspace (e.g., a desk lamp).
However, 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" lens and a focal length of 9" (creating an approximately 37° beam angle). This nomenclature was used because traditionally a larger lens directly equated with more light output.
A VRB-25 at Highland Light Side view of a six-lens VRB-25. For outdoor use, bird spikes are added to the top For outdoor use, bird spikes are added to the top The VRB-25 is a lighthouse optical system designed and built by Vega Industries Ltd. in Porirua , New Zealand .