Theatrical Fixture with adjustable lens 150 W through 1500 W.
(pronounced "Fre-nell") A type of lantern which produces an even, soft-edged beam of light through a Fresnel lens. The lens is a series of stepped concentric circles on the front and pebbled on the back and is named after its French inventor, Augustin Jean Fresnel (1788-1827).
Pattern of a special form of condenser lens consisting of a series of concentric stepped rings, each ring a section of a convex surface which would, if continued, form a much thicker lens. Used on focusing screens to distribute image brightness evenly over the screen.
Pronounced "fra-nell". Traditional stage lighting instrument with fresnel lens and barn doors for fine tuning. They are rarely used in live touring situations. Submitted by Karl Kuenning RFL from Roadie Net.
A spotlight with a soft-edge lens.
A lighting instrument with a graduated lens that throws a soft, generally defocused beam of light. Most fresnels allow for some control over the focus of the beam by means of a sliding mechanism.
lantern producing a soft-edged beam of light. The diameter of the beam can be varied by varying the distance between the lamp and the lens. The name comes from the French physicist who invented the lens shape used. The lens is a series of stepped rings, each with the curvature that a plano-convex lens of the same diameter would have at that radius. In addition to softening the beam edges, this has the effect of increasing light transmission through the lens (more so prev iously, when lens materials were not as good as today).
French physicist who invented polarized light and invented the Fresnel lens (1788-1827)
a flat lens consisting of a number of concentric rings that reduces spherical abnormalities
a particular kind of lighting instrument
(frah-NELL) a type of focusing system made up of hundreds of prisms which amplify and focus the light from a lighthouse into a narrow beam so that it can be seen miles away. Invented by Augustin Jean Fresnel of France.
A kind of spotlight in which the light is concentrated by a fresnel lens (a lens with concentric ridged rings). Projects a variable angle soft-edged beam. Sometimes called a frĂȘnel and given the French pronunciation.
A wash light utilizing a stepped lens and a adjustable base position.
A standard stage lighting instrument. The Fresnel produces a characteristically soft edged beam created by the pebbled surface on the back of the Fresnel lens. Since the Fresnel is used extensively in film and television production there are a vast range of types available. Fresnels can range in size from 3/" in diameter to several feet and in wattage from 150 watts to 10 kilowatts or more.
Wash luminaire using Fresnel lens; modifying the spacing between the lens and the lamp/reflector assembly can change field angle, named after French inventor, Augustin Jean Fresnel (1788 - 1827).