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Same as 1/60 to 1/125. I just memorized the stops from 2.8 to 22, but I don't think I ever realized every one doubled the one 2 before it, that is helpful I guess. Thanks.
"Believe those who are seeking the truth; doubt those who find it." | |
It is based in some very sturdy and very practical math. It's no more complicated than working with guide numbers on flashes.
But it's nine in the morning, and my brain is mush. I'll just say that 1/3 of a stop above 8 minutes is 10 minutes, 4.7 seconds. Half a stop above 8 minutes is 11 minutes and 18.8 seconds.
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Yees... I explained, it's of the form 2stop.
KrMacGyver: the f/numbers are square roots of two; they're describing a doubling of area in the aperature, and of course to double the area of a circle (pi*r2) means a square-root of 2 multiplication of the radius or diameter. And it just so happens that the powers of the square roots of 2 are (rounded to 1 decimal place) 1, 1.4, 2, 2.8... yes they do double every other stop but powers of the square root of two are where the sequence has its origins.
[last edit 9/30/2004 4:54 PM by Servo - edited 3 times]
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Posted by Servo
Yees... I explained, it's of the form 2stop. |
Ah, you did. See, that's part of the brain mush thing.
I was trying to go more general than that, using antilogs and shit. No worries, yours is simpler.
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