Quitz of the day ( 4 )

choose the correct formula


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Jed

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Jan 19, 2002
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#2
Eh, your formulas all very complicated lah. I can tell you the answer and it doesn't involve more than simple multiplication. No division, brackets, curly brackets, squares, square roots, cubes, cube roots, etc...
 

erwinx

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Jan 18, 2002
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#3
yah so cheem, guesstimate can already:


84 x 1.4 x 1.4 x 1.4 = 230.
 

shawntim

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Feb 13, 2002
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#4
what are you guys talking about ? what is a guide number?
 

ninelives

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Jan 16, 2002
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#5
If the guide number for an ISO 100 film is 84, the guide number for an ISO 800 film would be ??

answer is GN2 = GN1*(SQUARE ROOT OF ISO2/ISO1)

:


800/100 = 8

square root of 8 = 2.83

84*2.828 = 238

GN2=200.

the iso 800 guide number will be 238.
 

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