Cinematography Quiz 2

What are the functions of light?

• exposure

• creating depth

• guiding viewer’s eye

• creating symbolic connotation

What is the most important principle on any film set?

safety

What measurement is used to monitor the strength of an electric current?

amperage (amps)

What is amperage measured in?

amperes

What are amps used for?

expressing the flow rate of electric charge and describing the volume of potential electricity

What is the rate of energy transfer with respect to time?

wattage (watts)

What do watts describe?

the quantity of energy used per second

What is the difference in electric potential between two points?

voltage (volts)

What is the voltage in the US?

120 V

What is the relationship between amps, watts, and volts?

Amps = Watts/Volts

Why is amperage important?

if you draw more power than what the electrical circuit is designed to carry you will trip the breaker — this will cause lost power and lost time

What is the amperage on most circuits?

20A

What do we do to avoid popping the breaker?

rounding voltage down to 100 v instead of 120 v

What is the resulting amperage that has buffer room built in?

paper amps

What are lights measured in?

watts

What type of light uses 650 watts?

tweenie

What type of light uses 1000 watts?

baby

What type of light uses 2000 watts?

junior

What type of light uses 5000 watts?

senior

What choices need to be made when constructing lighting?

• angle

• height

• intensity

• color

• quality

What is the biggest light we can plug into household power?

2k (20 amps = 2000 watts / 100 v)

What is the equation to measure power distribution?

amperage = wattage / volts

What kind of circuits do we have on the SCA stage?

3 100A

Where do the power lines originate on the SCA stage?

distribution boxes

What cables carry additional energy flow from 100A lines?

100 Amp Bates cables

What is a distro box that has five 20 A circuits?

lunch box

What kind of outlets do lunch boxes have?

20A Bates circuits or 20A Edison circuits

What are lighting tools?

• lights

• stands (c-stands)

• flags (solid, net, diffusion)

• apple boxes

• sand bags

• bounce cards

What are lighting choices?

• angle (horizontal)

• height (vertical)

• intensity

• quality

• color

What is related to the definition of shadows created by a light?

quality of light

What determines quality of light?

the size of the source related to the distance of the subject

What ways can you make light softer?

• make the source larger

• move the source closer to the subject

What tools can be used to create soft light?

• diffusion

• bounce board

  • a combination of both

What is the set-up where light is bounced off a bounce card and then directed through diffusion?

book light

What is the practice of using lights in three different positions to create a sense of depth in an image?

• key light (exposure)

• fill light (contrast)

• back light (separation)

What is the difference in intensity between the key light and the fill light?

contrast ratio

What would the contrast ratio be if the key light were twice as bright as the key light (1 stop)?

2/1

What is the reflection of the light source in the eyes of the subject?

eye light