Nice photo, Erik_L. I've never seen smoke from stacks done in long exposure.
EdZep Senior Member  252 posts Likes: 1 Joined Jul 2008 More info | Nice photo, Erik_L. I've never seen smoke from stacks done in long exposure.
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tenmikemike Junior Member  24 posts Joined Dec 2009 Location: Phoenix AZ More info | Dec 30, 2009 00:58 | #17 Creepy Crawler wrote in post #9287064  What are you crazy people talking about?????????? Area rule (from high school trig/algebra) Canon T1i / 10-22mm USM / 18-55mm EFS / 50mm/1.4 USM / 55-250mm EFS / 100mm EF USM Macro / Speedlite 270EX / old Leitz Tiltall tripod / Canon 200EG photo backpack
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Omaru Goldmember  1,170 posts Likes: 5 Joined Mar 2009 Location: Paris, France More info | Dec 30, 2009 01:41 | #18 Creepy Crawler wrote in post #9287064 What are you crazy people talking about?????????? They're talking about the origins of the universe. Visit my flickr
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Snydremark my very own Lightrules moment More info | f/4 to f/8 would be TWO full stops, which reduces the light by half each time. So, to keep the same exposure as f/4 and 300s, the settings should have been f/8 and 1200s... If I remember my math correctly - Eric S.: My Birds/Wildlife
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apersson850 Obviously it's a good thing  More info | Ha-ha, I give up. I was too tired to see the error myself, when I responded. Anders
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PacAce Cream of the Crop  26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Dec 30, 2009 07:02 | #21 Erik_L wrote in post #9287004 I let my light meter tell me what's what. Never did a pic that was longer than 25 seconds or so: http://i1021.photobucket.com …mrndmguy/Untitled-2-1.jpg If you let the light meter (I assume you're talking about the one in the camera) tell you what's what, then you'll never be doings pics longer than 30 seconds because that's the limit of the built-in metering (to date). ...Leo
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spiralspirit Senior Member 940 posts Joined Dec 2009 Location: Manitoba, Canada More info | Dec 30, 2009 07:43 | #22 Creepy Crawler wrote in post #9287064 What are you crazy people talking about?????????? takin pichurs canon 1dmk2* Canon XSi * Sigma 24-70 f/2.8 EX DG * Canon 17-40mm f/4L * Sigma 70-200 f/2.8 EX * Canon 50mm f/1.8 *
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CreepyCrawler Member  193 posts Likes: 1 Joined Mar 2009 Location: East Greenville Pa. More info | Dec 30, 2009 08:15 | #23 Omaru wrote in post #9287816 They're talking about the origins of the universe. Man I haven't been this confused since the day I said I Do! All I see is numbers,numbers and more numbers..... I have a calculator and guess what I still don't get it! E=mc2 Jim S. Young
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PacAce Cream of the Crop 26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Dec 30, 2009 08:23 | #24 Creepy Crawler wrote in post #9288850 Man I haven't been this confused since the day I said I Do! All I see is numbers,numbers and more numbers..... I have a calculator and guess what I still don't get it! E=mc2 Sorry but you got the equation wrong. It's E=mc² ("E" equals "m" "c" squared) ...Leo
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apersson850 Obviously it's a good thing More info | OK, so I should have written that 5.6²/4²=2, then. Anders
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PacAce Cream of the Crop 26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Dec 30, 2009 12:34 | #26 apersson850 wrote in post #9290112 OK, so I should have written that 5.6²/4²=2, then. It takes you know how to write superscripts! But you did it right the first time, though. But E=mc2 is not the same as E=mc^2. ...Leo
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tigerotor77w Goldmember More info | Dec 30, 2009 12:56 | #27 apersson850 wrote in post #9290112 OK, so I should have written that 5.6²/4²=2, then. It takes you know how to write superscripts! Actually, 5.6^2/4^2 = 1.96... != 2.
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Jon Cream of the Crop  69,628 posts Likes: 227 Joined Jun 2004 Location: Bethesda, MD USA More info | Dec 30, 2009 13:09 | #28 tigerotor77w wrote in post #9290502 Actually, 5.6^2/4^2 = 1.96... != 2.  And how do you write superscripts? On a PC, use the Numeric Keypad and type [ALT] 0178 to get ², [ALT]0179 for ³. Jon
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1]  More info | Dec 30, 2009 14:06 | #29 Creepy Crawler wrote in post #9287064 What are you crazy people talking about?????????? Reciprocity failure...a phenomenon associated with film, when extremely long exposures do not double the amount of light recorded by the film when the length of time is doubled, but requires a greater increase of time to compensate for the non-linear exposure response of the emulsion. 1/8 sec. f/22 is not the same as 16 sec. f/2 because film might need 28 sec. f/2 to compensate for reciprocity failure. 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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PacAce Cream of the Crop 26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Dec 30, 2009 14:19 | #30 tigerotor77w wrote in post #9290502 Actually, 5.6^2/4^2 = 1.96... != 2. And how do you write superscripts? Actually, it would be equal to 2 if the exact value of f/5.6 (i.e. 5.65685424949238 ) were used in the equation. The 1.96 is the result of rounding. ...Leo
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