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F
FRESNEL
- Soft edge light that allow adjustment of the beam size from spot to flood by means of a sliding knob.
- (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). He developed the lens for French lighthouses so that they could be seen further out to sea and could achieve a longer focal length with a lot less glass than a standard plano-convex lens.
Types of lantern
FRONT OF HOUSE (FOH)
- Every part of the theater in front of the proscenium arch. Includes foyer areas open to the general public.
- All lanterns which are on the audience side of the proscenium and are focussed towards the stage.
The backstage areas of the theater are known as Rear of House (ROH).
FROST
A diffusing filter used to soften the edges of a light beam. Frosts are commonly used in profiles in front of house positions to achieve the same beam edge quality in all lanterns. Different strengths of diffusion frost are available from many color filter manufacturers.
FTP
File Transfer Protocol - a method of transferring files across the internet.
FULL RANGE SPEAKER
Produces high, mid, and low range frequencies.
FULL UP
A bright lighting state with general cover lanterns at "full" (100%) intensity.
FULL UP FINISH (FUF)
A shorthand note for manual desk lighting operators to bring all relevant dimmers to full for the end of a song / finale of a show to "draw the applause". Still applies for the snap build on the last beat of a song.
FUSE
Protective device for electrical equipment (E.g. dimmers). The fuse link will melt when excess current flows, preventing damage to people or equipment. Every piece of electrical equipment has at least one fuse in its associated circuit.
FUZZ LIGHT
A lamp with a revolving mirror and a colored plastic dome. Gives a "police light" effect. Usually 12 Volt or 240 Volt operation.
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