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#11
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Infrared Photography Competition
Pierre J. Proudhon wrote:
In article , "Bill Again" wrote: "Derek Fountain" wrote in message reenews.net... DIMi is running an infrared photography competition sponsored by MaxMax.com with monthly IR filter prizes and a grand prize of a digital camera conversion to IR mode, worth US$450. Erm, presumably you need an IR camera in order to take part in the competition, and so the grand prize would, kind of by definition, be worthless to its winner? Not necessarily so. Many digital cameras can take IR pictures using the relevant filters. That is not IR Photography. There is a big difference between using a filter and using the film. Uh, what? If you mean simulating IR in software "filters," that's one thing. Otherwise, actual IR photons don't care what kind of sensor they hit, whether it's an electronic array or film. -- It Came From Corry Lee Smith's Unclaimed Mysteries. http://www.unclaimedmysteries.net "Being an Auburn fan explains a lot about what is wrong with you, Unclaimed ... You didn't chose to address any of my post except this last little piece where I ridiculing you for being an idiot." - "Altie" on rec.sport.football.college, 2006 |
#12
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Infrared Photography Competition
In article . net,
Unclaimed Mysteries the_letter_k_and_the_numeral_4_doh@unclaimedmyste ries.net wrote: Pierre J. Proudhon wrote: In article , "Bill Again" wrote: "Derek Fountain" wrote in message reenews.net... DIMi is running an infrared photography competition sponsored by MaxMax.com with monthly IR filter prizes and a grand prize of a digital camera conversion to IR mode, worth US$450. Erm, presumably you need an IR camera in order to take part in the competition, and so the grand prize would, kind of by definition, be worthless to its winner? Not necessarily so. Many digital cameras can take IR pictures using the relevant filters. That is not IR Photography. There is a big difference between using a filter and using the film. Uh, what? If you mean simulating IR in software "filters," that's one thing. Otherwise, actual IR photons don't care what kind of sensor they hit, whether it's an electronic array or film. The results are different if you spent any time using IR film. All Infrared film is sensitive to both some Infrared and visible light. Digital IR photography typically relies on reflected NIR from sources like the sun and incandescent lamps. Digital camera sensors based on silicon are not sensitive to the far (thermal) IR wavelengths (typically 3.0µ and longer) emitted by objects at room to body temperatures. Heat leaks from houses aren't visible in the NIR, and people, animals and other objects at room to body temperatures don't glow in the NIR any more than they do in visible light. To photograph them in the dark, you have to provide proper NIR illumination using a suitably equipped camera like the Sony DSC-F7x7 or an external NIR-only flash with no filter. I can go on but you bore me. |
#13
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Infrared Photography Competition
Pierre J. Proudhon wrote:
The results are different if you spent any time using IR film. All Infrared film is sensitive to both some Infrared and visible light. Digital IR photography typically relies on reflected NIR from sources like the sun and incandescent lamps. Digital camera sensors based on silicon are not sensitive to the far (thermal) IR wavelengths (typically 3.0µ and longer) emitted by objects at room to body temperatures. Heat leaks from houses aren't visible in the NIR, and people, animals and other objects at room to body temperatures don't glow in the NIR any more than they do in visible light. To photograph them in the dark, you have to provide proper NIR illumination using a suitably equipped camera like the Sony DSC-F7x7 or an external NIR-only flash with no filter. I can go on but you bore me. The fact that the results are different does not make one more valid than the other. Digital sensors don't have the same halation of many IR films, so the results look a bit different, that's all. What you then say about digital IR also applies to film IR, since both rely on reflected NIR. IR film also does not have sensitivity beyond the NIR, typically cutting off before 1000nm, so I don't get the point you are trying to make. Cheers, Wayne -- Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog http://www.digitalimagemakerworld.com/ |
#14
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Infrared Photography Competition
UC wrote:
****ing idiots. Why give a camera away as a prize, when you need a camera to win? Give away an ipod or something else, dumbass. I'd normally ignore such a post but I must correct one thing: the grand prize is not a camera, but a camera conversion of a camera that the winner must provide. The monthly prizes are also filters that people would not commonly have and thus offer something interesting. Many people have several cameras. In my case I chose to have one converted to IR only for much shorter exposures. Judging from the entries that are also starting to roll in, others obviously also think it is worthwhile. Cheers, Wayne -- Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog http://www.digitalimagemakerworld.com/ |
#15
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Infrared Photography Competition
In article ,
"Wayne J. Cosshall" wrote: The fact that the results are different does not make one more valid than the other. No. But they are different. That was my point. Yawn. |
#16
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Infrared Photography Competition
Pierre J. Proudhon wrote:
In article , "Wayne J. Cosshall" wrote: The fact that the results are different does not make one more valid than the other. No. But they are different. That was my point. Yawn. What it means, this "Yawn"? -- Frank ess |
#17
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Infrared Photography Competition
On Tue, 05 Dec 2006 13:59:03 +0100, Gisle Hannemyr wrote:
With a DSLR???? Of course not - the way Bill Again describes the test only works if the camera has an EVF. But you can do the same test with a DSLR by taking a photograph of a tv-remote while somebody presses a button on it that makes it emit IR. When you review the image on the review screen, you'll see the IR glow described. That's a neat and useful trick that works with my Sony IR remote. But an EVF isn't required, since the blast of IR shows up nicely on the LCD display of Canon's A620 which has an optical viewfinder. Also, there may be several DSLRs that can also detect IR without having to take a picture. These are the ones that offer live, real-time viewing on their LCD displays, and are manufactured by Olympus, Panasonic and Leica. |
#18
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Infrared Photography Competition
Pierre J. Proudhon was strip-searched in Waverly, AL for writing in part:
The results are different if you spent any time using IR film. All Infrared film is sensitive to both some Infrared and visible light. Digital IR photography typically relies on reflected NIR from sources like the sun and incandescent lamps. Digital camera sensors based on silicon are not sensitive to the far (thermal) IR wavelengths (typically 3.0µ and longer) emitted by objects at room to body temperatures. Many of us are already well aware that: 1) a silicon detector needs refrigeration to effectively image IR beyond near-IR. 2) near-IR photography relies heavily upon primary illumination from a strong source such as the Sun. 3) an 89B-ish filter with any digital camera, converted or not, is unlikely to be used in thermography. .... I can go on but you bore me. MISSION ACCOMPLISHED. -- It Came From Corry Lee Smith's Unclaimed Mysteries. http://www.unclaimedmysteries.net |
#20
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Infrared Photography Competition
Wayne J. Cosshall wrote: UC wrote: ****ing idiots. Why give a camera away as a prize, when you need a camera to win? Give away an ipod or something else, dumbass. I'd normally ignore such a post but I must correct one thing: the grand prize is not a camera, but a camera conversion of a camera that the winner must provide. The monthly prizes are also filters that people would not commonly have and thus offer something interesting. Many people have several cameras. In my case I chose to have one converted to IR only for much shorter exposures. Judging from the entries that are also starting to roll in, others obviously also think it is worthwhile. Cheers, You're a moron. Wayne -- Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog http://www.digitalimagemakerworld.com/ |
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