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<blockquote data-quote="Revet" data-source="post: 229402" data-attributes="member: 17612">I get that f stops are not linear, but isn't it so that increasing your f value by one stop (ie. 5.6 to 8) is halving the light.&nbsp; So although the f scale is not linear, it is linear if you think of it in stops, Correct?Maybe another way to put it.&nbsp; I had to read over the &quot;Four Fundamentals We Must Know&quot; to make the whole thing pretty simple.&nbsp; Here is what I got out of it; When you are talking in terms of stops, you are essentially either halving or doubling the light by by changing one stop in either ISO, shutter speed, aperture, or flash power.&nbsp; What is different is when you try to use distance.&nbsp; Then you have to take into consideration the inverse square rule in that if you double or half the distance, it is actually 2 stops (or use a guide number when using flash which makes the inverse square law easy).If this is all correct which I think it is,&nbsp; the statement in the &quot;Four Fundamentals&quot; in the section on &quot;Converting Guide Number for Iso&quot; is Incorrect.&nbsp; It says, and I quote, &quot;Doubling ISO doubles distance range, or doubles f/stop number, which is two more stops.&quot;&nbsp;&nbsp; To me, doubling ISO would be going from 200 to 400 and this is one stop, not two as it states.What am I missing here or is that a typo or maybe I am not reading it correctly.</blockquote>

[QUOTE="Revet, post: 229402, member: 17612"] I get that f stops are not linear, but isn't it so that increasing your f value by one stop (ie. 5.6 to 8) is halving the light. So although the f scale is not linear, it is linear if you think of it in stops, Correct? Maybe another way to put it. I had to read over the "Four Fundamentals We Must Know" to make the whole thing pretty simple. Here is what I got out of it; When you are talking in terms of stops, you are essentially either halving or doubling the light by by changing one stop in either ISO, shutter speed, aperture, or flash power. What is different is when you try to use distance. Then you have to take into consideration the inverse square rule in that if you double or half the distance, it is actually 2 stops (or use a guide number when using flash which makes the inverse square law easy). If this is all correct which I think it is, the statement in the "Four Fundamentals" in the section on "Converting Guide Number for Iso" is Incorrect. It says, and I quote, "[COLOR=#000000][FONT=verdana]Doubling ISO doubles distance range, or doubles f/stop number, which is two more stops." To me, doubling ISO would be going from 200 to 400 and this is one stop, not two as it states. What am I missing here or is that a typo or maybe I am not reading it correctly. [/FONT][/COLOR] [/QUOTE]

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