If a light meter is held up directly to a source, and the reading is 85 candelas/square meter........ then what would this number be equal to in foot candles? we are talking luminance units being converted to illuminance..... Any opinions?
Belmondo Cream of the Crop  42,735 posts Likes: 15 Joined Jul 2003 Location: 92210 More info | Oct 09, 2007 19:50 | #1 If a light meter is held up directly to a source, and the reading is 85 candelas/square meter........ then what would this number be equal to in foot candles? we are talking luminance units being converted to illuminance..... Any opinions? I'm not short. I'm concentrated awesome!
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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 09, 2007 20:02 | #2 Would this be a straight conversion from metric to standard measurements? Gear: Kodak Brownie and homemade pin-hole cameras. Burlap sack for a bag.
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No idea. I posted this question which was posed by my brother-in-law. I don't even understand the question.:o:o I'm not short. I'm concentrated awesome!
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hard12find Senior Member  597 posts Likes: 1 Joined Sep 2006 Location: Pacific Northwest USA More info | Oct 09, 2007 20:08 | #4 Tell your brother to not drink the bong water 20D, 10D, Fuji S-20, Mamiya C220 medium format, Sekonic L-508 meter, 2 alien bee 800's, AB remotes, Sigma 500 HS flash, 70-200 F2.8 L, Sigma 24-70 F2.8 EX DG, lots of glass, lots of stuff,
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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 | I'm pretty sure you're speaking a foreign lanuage, but there are a sizeable number of conversions here: -David
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SkipD Cream of the Crop  20,476 posts Likes: 165 Joined Dec 2002 Location: Southeastern WI, USA More info | Oct 09, 2007 20:14 | #6 I think you will find the answer in this article Skip Douglas
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DrPablo Goldmember  1,568 posts Likes: 3 Joined Jan 2006 Location: North Carolina More info | Oct 09, 2007 20:23 | #7 cd/m^2 is a pretty standard way of measuring light -- as opposed to stops which aren't actually a measure of light at all (or EV, which isn't either). Haven't heard of foot candles though. Canon 5D Mark IV, 24-105L II, 17 TS-E f/4L, MPE 65, Sigma 50 f/1.4, Sigma 85 f/1.4, 100 f/2.8L, 135 f/2L, 70-200 f/4L, 400 L
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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 09, 2007 20:44 | #8 DrPablo wrote in post #4096907  cd/m^2 is a pretty standard way of measuring light -- as opposed to stops which aren't actually a measure of light at all (or EV, which isn't either). Haven't heard of foot candles though. Ansel discusses foot candles in his book, "The Negative", page 11 under Incident Light. Gear: Kodak Brownie and homemade pin-hole cameras. Burlap sack for a bag.
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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 09, 2007 20:50 | #9 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.Thanks for the links. My brain now needs a drink or two or ten to recover from reading that. Gear: Kodak Brownie and homemade pin-hole cameras. Burlap sack for a bag.
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lostdoggy King Duffus  4,787 posts Joined Aug 2004 Location: Queens, NY More info | Oct 09, 2007 20:54 | #10 isn't foot candle the amount of light produce by one candle at a distance of one foot away???
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SkipD Cream of the Crop 20,476 posts Likes: 165 Joined Dec 2002 Location: Southeastern WI, USA More info | Oct 09, 2007 21:06 | #11 lostdoggy wrote in post #4097086 isn't foot candle the amount of light produce by one candle at a distance of one foot away??? Yup. Skip Douglas
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lostdoggy King Duffus 4,787 posts Joined Aug 2004 Location: Queens, NY More info | Oct 09, 2007 21:08 | #12 So one is about luminence and the other is about radiance.
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DrPablo Goldmember 1,568 posts Likes: 3 Joined Jan 2006 Location: North Carolina More info | Oct 09, 2007 21:17 | #13 Karl C wrote in post #4097037 Ansel discusses foot candles in his book, "The Negative", page 11 under Incident Light. Thanks, Karl, Canon 5D Mark IV, 24-105L II, 17 TS-E f/4L, MPE 65, Sigma 50 f/1.4, Sigma 85 f/1.4, 100 f/2.8L, 135 f/2L, 70-200 f/4L, 400 L
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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 09, 2007 21:37 | #14 DrPablo wrote in post #4097178 Thanks, Karl, I think he discusses cd/m^2 as well -- I'm pretty sure it's from that very book that I learned about it. Been a while, though. I'm sure he does too. My pea-brain is still spinning from what I've read so far and I'm only on page 40-something. Gear: Kodak Brownie and homemade pin-hole cameras. Burlap sack for a bag.
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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 21:42 | #15 Ruth.
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