Now for the BIG question....WHY do we have to know all of this???? 
Naturalist Adrift on a lonely vast sea 5,769 posts Likes: 1251 Joined May 2007 More info | Now for the BIG question....WHY do we have to know all of this????
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Primm Senior Member  787 posts Joined Aug 2007 Location: I come from the land Down Under More info | Oct 09, 2007 21:49 | #17 Buggered if I know - I just plugged the numbers! Ruth.
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ibdb TD's worst nightmare!  6,484 posts Likes: 7 Joined Jan 2006 Location: Puyallup -- Don't worry. Nobody else can pronounce it either. More info | SkipD wrote in post #4096851  I think you will find the answer in this article . I am not about to try to paraphrase it, though .I even found a conversion calculator for you.I did find the right place to look! Karl C wrote in post #4097072 Thanks for the links. My brain now needs a drink or two or ten to recover from reading that. I just found a likely place for him to find an answer. I made no claim about knowing what it was I was finding. I used the calculator, found an answer, and I know no more about the whole process, or the end result, than I did before I started. Reminds me a lot of college. -David
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DavidEB Goldmember  3,117 posts Joined Feb 2005 Location: North Carolina More info | Oct 09, 2007 22:35 | #19 as I understand it, a foot candle measures the intensity of light given off in all directions by a standard source at a standard distance, while a candela measures the intensity of light given off in a defined solid angle (steradian) by a different standard source. So they measure different things, much as pressure is force per unit area, so a candela is proportional to foot-candles per unit solid angle. The conversion factor is given in the citation by Primm (which also indicates the division by steradians). But also as I understand it, a candela is a monochromatic light and a foot-candle is integrated over wavelengths (total luminosity) so if the color spectrum of the source changes, the conversion changes also. David
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cdifoto Don't get pissy with me  34,090 posts Likes: 44 Joined Dec 2005 More info | Oct 09, 2007 22:45 | #20 DavidEB wrote in post #4097665 So they measure different things So it's kinda like comparing the phrase "I don't give a crap" with "I need an Excedrin"...am I not correct? Did you lose Digital Photo Professional (DPP)? Get it here
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KarlC Goldmember 1,953 posts Likes: 1 Joined Apr 2006 Location: Now: N 39°36' 8.2" W 104°53' 58"; prev N 43°4' 33" W 88°13' 23"; home N 34°7' 0" W 118°16' 18" More info | Oct 10, 2007 06:41 | #21 For the next time you're using candles as lighting... Gear: Kodak Brownie and homemade pin-hole cameras. Burlap sack for a bag.
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Thanks for the feedback. I'm sending a link to this thread to my bro-in-law. Hopefully he'll find something useful here. I'm not short. I'm concentrated awesome!
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1]  More info | Oct 10, 2007 10:56 | #23 The topic seems to generally not be well understood. In a book written by instructors at Rochester Instititute of Technology, they cover the topics of candela and footcandles, but artfully skirt any detailed discussion of conversion between units! You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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PhotosGuy Cream of the Crop, R.I.P.  More info | Oct 10, 2007 21:01 | #24 I'm really sorry I read all of this! FrankC - 20D, RAW, Manual everything...
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