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F
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.
FOLLOWSPOT
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.
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.
F.B.O.
Abbreviation for Fade to Blackout.
FADE
A fade is an increase, diminishment or change in lighting or sound level.
FADE TIMES
On computerized memory lighting control desks, a lighting fade can have two
times - an up fade and a down fade. The Up fade time refers to the time it
takes dimmer levels to rise to their new positions. The Down fade time
refers to the time for dimmer levels falling to their new positions.
More about Fade Times
FADER
A vertical slider which is used to remotely set the level of a lighting or
sound channel.
FAR CYC
(US) Lighting instrument used to light cycloramas or drops.
FEED
A power supply to a piece of equipment or installation is termed a "feed".
Sound equipment and sensitive computer equipment should have a clean feed -
that is, a supply that is free from interference from other equipment. A
signal from one system to another is also known as a feed (for example, an
audio signal from the FOH desk to a TV company videoing a concert is known
as a feed.)
FEEDER
A main power cable to an installation is known as a feeder.
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