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F
FOOTLIGHTS
A compartmentalized batten sometimes recessed into the front edge of the
stage, used to neutralize shadows cast by overhead lighting. Modern lighting
equipment renders footlights virtually obsolete except for period/special
effects.
FRENCH FLAG
Film/Video term. A card or metal panel fitted to an adjustable arm used to
stop unwanted light from directly entering the lens of a camera.
FRESNEL
(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)
1) Every part of the theater in front of the proscenium arch. Includes foyer
areas open to the general public.
2) 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 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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