Calculating Light RatiosOnline version In this quiz, you will be tested on your ability to calculate light ratios, also known as contrast ratios, in foot-candles and f-stops. by Denise Taylor 1 What is the stop difference between 500 fc and 125 fc? a 1 stop b 2 stops c 3 stops d 4 stops 2 The key light measures 240 fc and the fill light measures 30 foot candles. How much brighter is the key light to the fill light? a 2 time brighter b 4 times brighter c 8 times brighter d 16 times brighter 3 What is the stop difference in an 8:1 ratio? a 1 stop b 2 stops c 3 stops d 4 stops 4 Which of the following light ratios would be considered the most dramatic? a 1:1 b 2:1 c 4:1 d 8:1 5 How many stops are between f 2.8 and F 5.6? a 1 stop b 2 stops c 3 stops d 4 stops 6 A key light that is measuring at an f stop value of f 11 and a fill light that is measuring an f stop value of f 5.6 has a stop difference of 2 stops. How many times brighter is the key light to the fill light? a 2 times brighter b 4 times brighter c 6 times brighter d 8 times brighter 7 Which of the following ratios would best describe a key light that is twice as bright as the fill light? a 2:1 b 4:1 c 8:1 d 16:1 8 What is the stop difference in a ratio of 32:1? a 4 stops b 5 stops c 16 stops d 32 stops 9 An f-stop and a stop are the same thing. a True b False 10 Which light ratio is represented in this diagram? a 2:1 b 4:1 c 8:1 d 16:1
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