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 O'neil
 |  | Re: Pitch Black Photography with Infrared Light
<Reply # 20 on 3/27/2003 12:24 AM >
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I didn't have the time to read all the postings... but if you are dealing with IR cameras on a particular site... you can "blind" those cameras with a cheap IR "maglite" you can buy at Radio Shack. That way, if anybody looks at the tape after, all they will see is a bright light. Of course, don't do that if you know someone may be watching what the cameras are filming...
I.O. QC Stealth Artists |
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phantom
Location: The Desert
Gender: Male
Creeping in the shadows
| |  | Re: Pitch Black Photography with Infrared Light
<Reply # 21 on 4/30/2003 5:05 PM >
| | | | Actually, regular film cameras see infrared light as well. The concern with photographing IR in this way is the film. To photograph something in IR with a regular camera, you do not need an IR LED. As you may know, infrared is basically heat. IR photography is useful if you have a space that's very dark and lighting it would be prohibitively expensive. Just go buy some IR film from a camera store. Keep in mind that it is in black and white, and there will be no relationship between the actual color of an object and the tone the object ends up as. This can produce some dramatic and interesting effects, but can only be predicted with experience.
Personally, I love black and white photography when it's done well, perhaps more than color photography.
When you do photograph, to make better pictures, keep in mind the main subject of color photography is color, so finding good color combinations will produce great photographs. The main subject of b&w photography is tone, so finding high contrast areas will make good pictures, by contrast I mean the lights vs. darks. You don't want too many middle greys in a b&w photo.
-~phantom~-
shadowlurking |
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Jester
 
Location: Vancouver,B.C. Canada
Gender: Male
Always just out of sight...
| |  | Re: Pitch Black Photography with Infrared Light
<Reply # 22 on 4/30/2003 5:10 PM >
| | | | actually, depending on the wavelength of Ir you use, will determine what kind of pic you will get. the lower end of IR will result in your green nightvision looks, while the high end will give you the "heat vision"... at least thats what i've seen in researching it...
typical IRflashlights/ nightvision goggles, etc, are in the low IR range
[last edit 4/30/2003 12:11 PM by Jester - edited 1 times]
It requires wisdom to understand wisdom: the music is nothing if the audience is deaf. |
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phantom
Location: The Desert
Gender: Male
Creeping in the shadows
| | | Re: Pitch Black Photography with Infrared Light
<Reply # 23 on 4/30/2003 6:11 PM >
| | | | I was mistaken about IR films. I am a photography student who didn't read his textbook very carefully before telling y'all what's up. IR films do photograph the visible spectrum of color.
How Infrared Film Works: From Photography, Seventh Addition (various authors)
Infrared film is sensitive to visible light and to invisible infrared wavelengths that are slightly longer than the visible waves of red light. These near-red waves often create unusual photographic effects because they are not absorbed or reflected in the same amounts as visible light. Objects that appear light to the eye may not reflect much IR, so IR images may have unexpected, even surreal, tonal relationships. These effects are particularly evident when a deep red filter is used on the lens; the filter blocks most visible wavelengths so that the photograph is taken mostly with IR waves.
Leaves, grass, and skin in an IR photo will be white because they reflect IR very strongly. Water particles in clouds also reflect IR, making clouds very light. But blue sky becomes very dark, because it's blue light is mostly blocked by the deep red filter. The film has a grainy look that softens surface detail and can produce an overall texture. Details are often diffused by halation, a diffuse, halo-like glow that surrounds very light objects, especially with overexposure.
Of course, the use of IR that we are concerned with is it's ability to photograph in complete darkness.
I realize that this was a little long winded and perhaps a bit dry, but I feel apologetic in my mistake about calling IR film black and white. Of course, if you do photograph in near or total darkness, your pic will come out black and white. Not to say that's a bad thing, but it's something to keep in mind.
-~phantom~-
shadowlurking |
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Avatar-X
    
Alpha Husky
Location: West Coast
Gender: Male
yay!
| | | Re: Pitch Black Photography with Infrared Light
<Reply # 24 on 4/30/2003 8:19 PM >
| | | | Yes, there is no way to photograph in darkness and have the pic be colour -- no red, blue, or green light is entering the camera, so how could there be a colour picture?
The picture will be made up of parts that have more infrared light (appears white) and pictures that have less (appears black). So, the result is a black and white photograph.
You could, afterwards, colour the picture in appropriatly.
huskies - such fluff. |
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phantom
Location: The Desert
Gender: Male
Creeping in the shadows
| | | Re: Pitch Black Photography with Infrared Light
<Reply # 25 on 4/30/2003 10:10 PM >
| | | | I was considering IR film for use in the cave expedition I have coming up and shooting in total darkness.
I realized this is a bad idea. Caves are very uniform in their temperature, so I probably wouldn't get a decent picture at all. But in steam tunnels, total darkness with IR film could produce some interesting results....
More research is called for I suppose.
-~phantom~-
shadowlurking |
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Jester
Location: Vancouver,B.C. Canada
Gender: Male
Always just out of sight...
| | | Re: Pitch Black Photography with Infrared Light
<Reply # 26 on 5/1/2003 2:09 AM >
| | | | you do of course realize that IR film still needs IR light. That's why they sell IR flashlights and spotlights.
Nightvision goggles and other devices have IR flashlights built on basically, to provide the light that we can't see with the human eye. If you shoot in a cave, no ambient IR light is present unless you are providing it, and your pic would be the same as normal film with no light... outside at night, there will be some IR ambiently, but not sure how well it will turn out without anymore being added...
One reason IR is not the very best covert nightsight is because since the standard ones have to produce their own IR, you are visible by that light to another nightvision user. The very expensive ones will use enhancing of ambient light instead of producing it's own.
It requires wisdom to understand wisdom: the music is nothing if the audience is deaf. |
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The Dark One
Location: Montreal, Quebec
Gender: Male
Twist
| | | Re: Pitch Black Photography with Infrared Light
<Reply # 27 on 5/1/2003 2:10 AM >
| | | | Antother thing about using IR film in your SLR:
Depending on the part of the IR spectrum you're using with your film, you have to compensate with your focusing. Your lens refracts IR light differently than the visible stuff. You know how light is split up by a prism? Well, the split continues in either direction, with the light we can't see.
It isn't like the LCD monitor on a camcorder or digital camera, where you can see what the camera is seeing, so you have to compensate for this.
*** MsMaul was kicked by MsMaul (I didn't eat enough bagels!!!!111) |
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Green Man
Location: Niagara Escarpment
Gender: Male
| | Re: Pitch Black Photography with Infrared Light
<Reply # 28 on 6/19/2003 4:10 PM >
| | | | Are any of you familiar with InfraRed light sticks? Crack one, toss it on the ground, or hang it up some where, and you've got a source of IR light. Plus they would also be good in a potentially explosive atmosphere. A company out in Edmonton (who supply private purchase kit to the military - and really good quality kit too I might add) called DropZone sell them for $6.99 each. Part number is 39-927502, and they last for three hours. They also sell twelve hour green, orange, red and yellow, eight hour white and blue, 30 minute red, yellow and white as well as 5 minute ultra orange. All those cost $2.99 each. Get in touch with them via http://www.drop-zone.cjb.net/. Don't know if they are on the website or not, but that should give you contact info anyway. Tell Brian Green Man sent you.
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