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FOG MACHINE
A machine that creates a cloud of smoke to enhance lighting effects.
FOG MACHINE (FOGGER)
A device which creates fog by vaporizing a fluid into a fine atmosphere through a heat exchange system. Some fog machines use oil- based fluids while other fluids are water or glycol based. The type of machine and fluid used affects the quality of the atmosphere produced. Fog can be very light and rise quickly in the slightly heated air, or can be very heavy and dense and tend to hang in large clouds. Fog machines can create effects similar to haze machines, dry-ice or liquid nitrogen foggers, oil crackers, etc, but are best at producing large volumes of dense atmosphere quickly.
FOLLOW-ON CUE / FOLLOW CUE
A cue that happens so soon after a previous cue, that it doesn't need to be cued separately. The follow-on can be taken by the operator once a previous cue is complete, or a lighting or sound cue can be programmed to happen a specific time after a previous cue. Fly follow-on cues are often taken as soon as the operator has completed a previous cue. Often abbreviated to F/O.
FOLLOWSPOT
- Designed to cast light on a performer or moving objects, most followspots contain a built in iris to adjust the spread of light, and a color boom to change colors.
- A manually operated lighting fixture specially designed for following performers as they move about the stage. Most followspots employ some method for manual control of iris, shutter, dowser, as well as a color boomerang.
- Usually, a powerful profile lantern usually fitted with its own dimmer, iris, color magazine and shutters mounted in or above the auditorium, used with an operator so that the light beam can be moved around the stage to follow an actor. Sometimes a beam light or other lantern may be used in the same way.
- Powerful followspots use discharge lamps which cannot be dimmed, so these followspots have mechanical dimming shutters to dim the light output.
FOOT
- The action of bracing the bottom of a ladder while a colleague climbs it (e.g. "Can you foot this for me please? I'll only be a couple of minutes").
- Holding the bottom edge of a flat with your foot while a colleague raises the top of it to a vertical position.
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
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.
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