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Server Time:
2024-05-08 05:22:17
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 Kirby
  
Location: St. John's, Newfoundland
Gender: Male
Ghost
 |  | IR filter
< on 11/9/2004 5:15 PM >
|  | | | What is a flashlight IR filter made out of?
What Digital cameras can use IR light instead of a flash?
where would u buy and IR illuminator?
i want to do a few night time infiltrations into 2 abandoned hospitals, but they are in residental areas and i dont want to be seen ( flashlight light and camera flashs)
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | BTW
<Reply # 1 on 11/9/2004 5:30 PM >
| | | | At my house now i have 3 digital cameras.
Kodak CX6230 <-- Cheap got it for UEing 2.0 mp
Cannon PowerShot A75 <-- my sisters, 3.2 mp
Cannon PowerShot s400 <-- Dads, 4.0 mp
can any of them use IR? are there any mods i could do?
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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ofberenonehand
 
Location: Minn-e-snow-ta
"Where now is Boromir the Fair? He tarries and I grieve."
| | Re: IR filter
<Reply # 2 on 11/9/2004 5:53 PM >
| | | | They probably pick up IR and translate to visible light. Pick up a cheap IR flashlight on ebay.
"That's What Government Is For; To Get In A Man's Way" -Mal |
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Grey_Fox
Location: London, ON, Canada
Gender: Male
I love me...
| | Re: IR filter
<Reply # 3 on 11/9/2004 6:55 PM >
| | | | You could use one of the IR sony handicams you can take pictures with them too.
"good old bunny and hand soup... just like mom used to make" |
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Servo
 
| | Re: IR filter
<Reply # 4 on 11/9/2004 7:48 PM >
| | | | The problem is that all those cameras (maybe not the Kodak, but definitely the Canons) have a hot mirror that screens out MOST IR. I say "MOST" because it isn't totally effective, so you can do IR photography, but it'll have to be long exposures done on a tripod. You won't be able to generate enough IR to use it like a flash. In fact, you probably won't be able to generate enough IR at all.
What you could do is get a film camera and load it with IR film, slap on an IR filter over your lens and flash, and try a test roll. But your flash's range will still be very much reduced, as most electronic flashes don't emit a terribly large amount of IR.
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Conundrum
Criticón
Location: GTA
Gender: Male
Now Entering The Bling Chamber
| | Re: IR filter
<Reply # 5 on 11/9/2004 8:53 PM >
| | | | I have a few canons and a few friends do to, and they work find with IR lighting, the cameras we have tried it on were the A60 to A80 and an EOS Digital Rebel.
Conundrum
[last edit 11/9/2004 8:54 PM by Conundrum - edited 1 times]
This posting is provided "AS IS" with no warranties, and confers no rights. Carpe Noctem
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Servo
| | Re: IR filter
<Reply # 6 on 11/9/2004 8:57 PM >
| | | | Posted by Conundrum
I have a few canons and a few friends do to, and they work find with IR lighting, the cameras we have tried it on were the A60 to A80 and an EOS Digital Rebel.
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Umm... yeah, I said, they will work, but they have hot mirrors so you have to do long exposures to get enough IR. In the daytime (full sun), with my digirebel and an Ilford SFX filter (almost pure IR) I have to do 15 second exposures at f/8 and ISO 100.
My point was, you're going to have to do long exposures and have one hell of an IR light for it to work. You won't just be able to pop an IR filter over your flashlight, point it at something, and grab a quick snapshot.
[last edit 11/9/2004 8:58 PM by Servo - edited 1 times]
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Conundrum
Criticón
Location: GTA
Gender: Male
Now Entering The Bling Chamber
| | Re: IR filter
<Reply # 7 on 11/9/2004 9:06 PM >
| | | | Posted by Servo
Umm... yeah, I said, they will work, but they have hot mirrors so you have to do long exposures to get enough IR. In the daytime (full sun), with my digirebel and an Ilford SFX filter (almost pure IR) I have to do 15 second exposures at f/8 and ISO 100.
My point was, you're going to have to do long exposures and have one hell of an IR light for it to work. You won't just be able to pop an IR filter over your flashlight, point it at something, and grab a quick snapshot.
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thats what I did with the Canon A60, we just put a filter on a Mag light and was able to see the area in pitch dark using the LCD Screen like it was daylight, and able to take pictures without having a long exposure
This posting is provided "AS IS" with no warranties, and confers no rights. Carpe Noctem
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Servo
| | Re: IR filter
<Reply # 8 on 11/9/2004 9:14 PM >
| | | | Maybe the A60 doesn't have a hot mirror then, or it's not as good. The newer cameras have more restrictive ones.
I'll have to try that out on my S50 sometime. Cool.
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Parteimitglied
Location: Manitoba, Canada
| | Re: IR filter
<Reply # 9 on 11/9/2004 11:08 PM >
| | | | I know that the Cannon Powershot S30 works to an extent. I was able to take a long exposure with a dark red filter over the lens, then separate the blue channel to get a IR picture.
 
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 10 on 11/10/2004 12:11 AM >
| | | | well if i had something to make a filter out of, i would put it on my one million candle watt spotlight
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 11 on 11/10/2004 12:37 AM >
| | | | No, the Wratten 87 filter will not work with Kodak's consumer level DC cameras.
The Wratten 87 filter allows only IR light to pass, blocking all visual light so the image is created with only IR light. That is how you get green foliage to look white in black and white images.
Since all of our cameras have an IR cutoff filter included on the imaging sensor, a Wratten 87 would do the user no good.
found that on the KODAK website
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 13 on 11/10/2004 1:20 AM >
| | | | Same kind fo thing, an IR flashlight filter, stole it from a fourm
Hi Guys, I'm new to this forum. I read this thread and would like to offer my findings on IR illumination...Dead cheap
Like many here, I've messed with IR Leds etc, there are only a few that can cut it, the best I found were some german multi-chip beasties, which are not bad, but about £10 each, so these were discounted.
I have 2 russian nightsights, a 1st and 2nd gen, the later cost about £2K I believe, it's 14 inches long with the 'Big' zoom lense & light hood. I have a 6 Volt lantern type lamp, which has good power, (note.. modded for sealed lead acid batt) I researched certain dedicated IR filters, obtaining some samples of the Lee IR 87 filters, light transmission above 730nm etc. These worked ok with my 2D mag-lite. Noting that all things that appear black are not always, I have a 'black' glass ashtray, that is indeed 'Not' black its actually dark red. It actually worked as a crude IR filter when hitting it with lots of light, the drawback being the glass is unnecesarily too thick and heavy. Baring these thoughts in mind, I applied the same to plastics. I obtained some ICI Persex, black of course, this also is indeed dark red. I cut a new lense for the 6V torch, replacing the original. An optical comparison between the Lee IR filter and the Perspex one appeared to have the same dull red glow etc. Tests with the Night sight were good, I could illuminate stuff at about 80 metres, (limited by the distance I could get from my garden). This same cheapy method should work for video cams. Perspex looks usefull..
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Servo
| | Re: IR filter
<Reply # 14 on 11/10/2004 4:28 AM >
| | | |
Probably so, but a little OT, why the hell would you wear IR glasses? The eye can't see into the IR range... all you'd see would be the dull red light that sneaks through the filter. And even if it did work, it'd be Near IR, not Far IR (which is more commonly associated with heat; things around room temp emit FIR, not NIR).
You could probably pick up an IR gel filter from a camera shop for less money.
[last edit 11/10/2004 4:28 AM by Servo - edited 1 times]
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 15 on 11/10/2004 4:41 AM >
| | | | I wouldnt wear the glasses, that seems pretty stupid. Im going to go to the theatre room in my school tomorrow and see if they have any filter plastics. if they doo ill see what i can do with it and test the cameras and post my results.
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 16 on 11/10/2004 4:24 PM >
| | | | Blocking Visible Light and Passing Infrared
This is easier than the other way around!
Here are several ways to do this.
1) Edmund Scientific in Barrington, NJ, USA (1-609-573-6250) sells a variety of filters.
Some of these are longpass filters made of Schott glass. These are high quality filters that are better than necessary for most purposes. It is advisable to choose a very long cutoff wavelength, preferably near or over 800 nanometers, since wavelengths in the 700's of nanometers are slightly visible. Wavelengths in the low-mid 800's are even very slightly visible.
Edmund also sells more general purpose visible-blocking IR filters.
So do some surplus dealers that advertise in magazines, including Popular Electronics and Electronics Now, and probably also some photography magazines.
2. Use a combination of deep red, deep green, and deep blue stage lighting filter gels. Adding deep blue-green to this and/or using two layers of each color makes the filter darker, but less efficient. Stage lighting filter gels of nearly all brands, colors, etc. pass IR.
ombining deep red, deep green, and deep blue Plexiglass also worked the last time I tried this.
3. Wratten filters of numbers 87, 87C, and 88A block visible light and pass IR. The 87C is the most visible-blocking of these, with almost complete blocking of wavelengths below 800 nM, and some significant absorption even into the mid 800's.
Wratten filters are available at some photographic supply stores and some scientific supply stores.
4. Someone out there reminded me of the color film trick, and gave me some specifics. Developing unexposed color slide film produces a filter that passes infrared and blocks visible. He mentions Ectachrome E6 film and claims optical density figures of 3 for visible (99.9 percent absorption) and .3 for 780 nM (50 percent absorption).
More IR and IR filter info at other sites:
IR and red filter info at Willem-Jan Markerink's photo site.
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 17 on 11/17/2004 2:41 AM >
| | | | I asked the theatre teached at my school if i could have some scrap gels. he gave me the key to the store room and told me to help my self. not alot of blue, bit i have enough for 4 layers, lots of red and a ton of orange and green. He told me that theres more coming in soon and that i can have more blue ( i told him i was doing a IR photography project) im making the filter as we speak, ill post details shortly.
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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Servo
| | Re: IR filter
<Reply # 18 on 11/17/2004 3:04 AM >
| | | | Just lemme make sure -- you know that if you want IR, you need an IR gel, or at least a red gel, right? A blue gel is gonna do exactly the opposite of what you want if you're trying to do IR photography.
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Kirby
Location: St. John's, Newfoundland
Gender: Male
Ghost
| | Re: IR filter
<Reply # 19 on 11/17/2004 3:20 AM >
| | | | the gels let IR through, the colors just block out the natural light, i got it to work with my kodak, but the little 2d flashlight im using isnt powerful enough and my 6d mag is at my dads house. the flashlight puts out no light at all ( 4 layers of blue and 2 of red) and my camera sees white light but a very small amount ( about the size of my fist). i put my knife against the wall and took a picture and u can see it. when i go to my dads tomorrow ill get the other 2 cames and my mag lite and check it out. If i hade more blue i would use my 1 mil spot light  .
[last edit 11/17/2004 3:21 AM by Kirby - edited 1 times]
MSN/Email: [email protected]
BE SWIFT, BE SILENT, BE INVISIBLE. |
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