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Infrared photography
I want to photograph and video in infrared mode.
I understand that some point-and-shoot cameras provide this style of photography/videography. Alternately, some people have "hacked" a camera by removing the IR filter from in front of the imaging element. There are instructions on-line to DIY this, or to send in your P&S to have it done. Basically, the IR filter is removed and replaced with another (not a procedure for the faint at heart). The replacement filter is $$$. My question is this: is this replacement filter that passes rather than blocks IR available as a gelatin or other commonly available filter that I can source elsewhere other than from these camera-mod services? Or can I just strip off the existing filter and not replace it with anything? I'm looking for quantitative data (the existence of IR) not qualitative data (a pretty picture). What function does the replacement filter provide (other than passing IR data)? To clarify, I want to "see" IR images real-time in the viewfinder, not post-process the image data to reveal the IR. If there's another forum you suggest I should ask this question in, please let me know. Thanks, -- DaveC This is an invalid return address Please reply in the news group |
#2
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Infrared photography
"DaveC" wrote in message
obal.net... I want to photograph and video in infrared mode. I understand that some point-and-shoot cameras provide this style of photography/videography. Alternately, some people have "hacked" a camera by removing the IR filter from in front of the imaging element. There are instructions on-line to DIY this, or to send in your P&S to have it done. Basically, the IR filter is removed and replaced with another (not a procedure for the faint at heart). The replacement filter is $$$. My question is this: is this replacement filter that passes rather than blocks IR available as a gelatin or other commonly available filter that I can source elsewhere other than from these camera-mod services? Or can I just strip off the existing filter and not replace it with anything? I'm looking for quantitative data (the existence of IR) not qualitative data (a pretty picture). What function does the replacement filter provide (other than passing IR data)? To clarify, I want to "see" IR images real-time in the viewfinder, not post-process the image data to reveal the IR. If there's another forum you suggest I should ask this question in, please let me know. Thanks, -- DaveC This is an invalid return address Please reply in the news group I don't know much about most of this, but it seems that once you remove the IR filter from the sensor, you could just attach an appropriate IR filter to the front of the lens. Of course, you would need the appropriate filter for each of the lenses that you use. Eric Miller www.dyesscreek.com |
#3
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Infrared photography
DaveC wrote:
I'm looking for quantitative data (the existence of IR) not qualitative data (a pretty picture). Isn't that the other way round? Qualitative meaning just yes/no while quantitative in addition tells you how much, e.g. darker or lighter on a b/w IR-image or blue/green/yellow/red/white on a color IR-image? jue |
#4
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Infrared photography
Isn't that the other way round?
Qualitative meaning just yes/no while quantitative in addition tells you how much, e.g. darker or lighter on a b/w IR-image or blue/green/yellow/red/white on a color IR-image? jue Quantitative: does it exist? do we have presence or absence? 0 or 0? Qualitative: what are its qualities? But to define in other terms, I want images that show the existence of IR wavelengths. If it's not a pretty picture, that's OK. Please let's not detour into this realm. Those who want to discuss quantitative vs. qualitative please start another thread... Thanks, -- DaveC This is an invalid return address Please reply in the news group |
#5
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OT: qualitative/quantitative (WAS: Infrared photography)
DaveC wrote:
Isn't that the other way round? Qualitative meaning just yes/no while quantitative in addition tells you how much, e.g. darker or lighter on a b/w IR-image or blue/green/yellow/red/white on a color IR-image? Quantitative: does it exist? do we have presence or absence? 0 or 0? Qualitative: what are its qualities? That is opposite to what I learned in science, especially in chemistry. There a qualitative analysis tells you _which_ components are present in a sample (yes/no). And a quantitative analysis tells you _how much_ (what quantity) of each component can be found. Wikipedia seems to support this view: "A quantitative attribute is one that exists in a range of magnitudes, and can therefore be measured. Measurements of any particular quantitative property are expressed as a specific quantity, referred to as a unit, multiplied by a number. Examples of physical quantities are distance, mass, and time." Please let's not detour into this realm. Those who want to discuss quantitative vs. qualitative please start another thread... Ooops :-). "Subject" adjusted as requested. jue |
#6
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Infrared photography
"DaveC" wrote in message
obal.net... I want to photograph and video in infrared mode. I understand that some point-and-shoot cameras provide this style of photography/videography. Alternately, some people have "hacked" a camera by removing the IR filter from in front of the imaging element. There are instructions on-line to DIY this, or to send in your P&S to have it done. Basically, the IR filter is removed and replaced with another (not a procedure for the faint at heart). The replacement filter is $$$. My question is this: is this replacement filter that passes rather than blocks IR available as a gelatin or other commonly available filter that I can source elsewhere other than from these camera-mod services? Or can I just strip off the existing filter and not replace it with anything? I'm looking for quantitative data (the existence of IR) not qualitative data (a pretty picture). What function does the replacement filter provide (other than passing IR data)? To clarify, I want to "see" IR images real-time in the viewfinder, not post-process the image data to reveal the IR. If there's another forum you suggest I should ask this question in, please let me know. Thanks, The problem is that you won't see an IR picture per se, as the image requires post processing to be anything but a dark red image. If your camera has a B&W mode, that would be helpful, but the image will still require post processing. |
#7
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Infrared photography
In article , bino
wrote: The problem is that you won't see an IR picture per se, as the image requires post processing to be anything but a dark red image. If your camera has a B&W mode, that would be helpful, but the image will still require post processing. false. |
#8
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Infrared photography
"nospam" wrote in message
... In article , bino wrote: The problem is that you won't see an IR picture per se, as the image requires post processing to be anything but a dark red image. If your camera has a B&W mode, that would be helpful, but the image will still require post processing. false. You got some facts jackass? Experience? I've shot IR film and IR digital. The red filter makes the color sensor see red. Period. |
#9
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Infrared photography
In article , bino
wrote: The problem is that you won't see an IR picture per se, as the image requires post processing to be anything but a dark red image. If your camera has a B&W mode, that would be helpful, but the image will still require post processing. false. You got some facts jackass? Experience? I've shot IR film and IR digital. The red filter makes the color sensor see red. Period. except that the blue pixels also pass infrared light and depending on the camera, the white balance, the strength of the infrared filter and the raw processing, the results can be virtually anything. i've used a couple of digital cameras for infrared and modified one of them myself. none of them produce red images out of the camera. on the camera's lcd screen and the jpegs they produce, the result is b/w. if anything, there's a mild greenish cast, perhaps because the camera is boosting green due to the weak response of the green pixels with infrared light. the very same image when shot raw and processed via adobe camera raw has an entirely different appearance than with nikon or canon's software. saying that it will always be red is simply false. |
#10
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Infrared photography
In rec.photo.digital bino wrote:
| "nospam" wrote in message | ... | In article , bino | wrote: | | The problem is that you won't see an IR picture per se, as the image | requires post processing to be anything but a dark red image. If your | camera has a B&W mode, that would be helpful, but the image will still | require post processing. | | false. | | | You got some facts jackass? Experience? I've shot IR film and IR digital. | The red filter makes the color sensor see red. Period. Who said anything about a red filter ... in this thread? Actually, I would recommend a IR-passing filter (e.g. type 89) on the lens after the IR-blocking filter is removed. The sensor (with a replacement all-passing filter to keep the optics consistent) will pick up IR in other colors. This is because the color separation of the sensor is not designed to discriminate IR (and hence why an IR-blocking filter needs to be added in the normal case). The red channel will get the most IR. The blue channel will get a lot. The green channel will get some. And these will vary by what IR wavelength is involved. So you will get some false color effects. Directly viewing the image on the camera screen will give some funny reddish colors for sure. Post processing can then give you the effets you want if you were using the correct lens-front filter to begin with (type 29 for some effects, type 89 for others, and type 87 for yet others). In some cases the desired effect is achieved by making everything monochrome. In other cases the desired affect is a color product derived from adding or subtracting the various color channels. Additionally, multiple shooting of a stationary subject with different lens-front filters (the above plus 25, 23, 15, 12, and none at all) can give you multi-channel info to even be able to derive the original visual image unaffected by infrared (with the correct formula). -- |WARNING: Due to extreme spam, googlegroups.com is blocked. Due to ignorance | | by the abuse department, bellsouth.net is blocked. If you post to | | Usenet from these places, find another Usenet provider ASAP. | | Phil Howard KA9WGN (email for humans: first name in lower case at ipal.net) | |
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