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Proving some jerk wrong... with Science! - For Kalimdor! [entries|archive|friends|userinfo]
kalimdor_wilson

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Proving some jerk wrong... with Science! [May. 7th, 2006|08:03 pm]
kalimdor_wilson
Yesterday I posted my Self Portrait in Infrared to a LiveJournal Canon20D group.

Another LJer (who does infrared photography) promptly informs me that it is not possible to do IR photography with a Canon 20D. I explain what I did, and why my photo really is an IR photo and this guy gets all offended! How dare I call it an infrared photograph!

What. The. Heck?

His claim is that the infrared-blocking filter inside the Canon 20D makes it impossible to capture infrared light. I know this is false, but I am unable to find the technical specs for that blocking filter... what to do?


Science to the rescue!

A friend of mine and I make a little trip to Radio Shack to prove once and for all that it is possible to capture infrared light with an unmodified Canon 20D digital SLR camera:


Step 1: Buy stuff at Radio Shack



We get some resistors, a circuit board, and some infrared LED lights:





Notice the wavelength of the lights: 940nm. This is well inside the infrared light range. If Mr. Easily-Offended is correct, it should be impossible to capture the light from these LEDs with my camera.


Step 2: Make some Science Coffee



No science experiment is complete without Science Coffee, so we make some.


Step 3: Drink Science Coffee while Science Buddy builds The Device



Remember kids, never do science without your Science Buddy. Especially if your Science Buddy knows more about electronics than you do and already owns a soldering iron.





Solder, Science Buddy! Solder!



The Device



We are ready to go! Yay!


Step 5: Prepare the experiment!



The Device is aimed at a plant. We would have used a kitten, but one was not available. Plus, it probably would have eaten The Device.


Step 6: Prepare the imaging equipment!

In today's experiment, we will be using the Hoya R72 infrared filter:




This filter blocks out all visible light with wavelengths shorter than 720nm. Infrared starts at around 780nm, so there is a tiny bit of visible red light that can pass through...




... but not much. :)

The filter is affixed to the front of the camera. The room lights are shut off. We shield our eyes (as we do not have IR saftey goggles) and activate The Device:



Step 7: Prove some jerk wrong... with Science!


(click image to download the original RAW-format .cr2 image that came straight out of the camera)

Voila! We have successfully imaged 940nm infrared light with an unmodified Canon20D digital SLR camera.

The moral of this story is: Get your facts straight before getting all snotty.
linkReply

Comments:
From: slapsomeone
2006-05-08 03:24 am (UTC)
That is unbelievably awesome. Barb says that you are the geekiest geek who ever geeked a geek.

I want to build devices! However, I think I'll settle for staging fight night with toys in my back yard and taking pictures. Would have been cooler with infrared.
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[User Picture]From: ladypajama
2006-05-08 03:27 am (UTC)
wow!
You really went to the extreme to prove that fella wrong.
How many hours did you spend on your proof?

I would have just told him he was dumb.

I am glad you aren't me.
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[User Picture]From: kalimdor_wilson
2006-05-08 04:36 am (UTC)
Not long. And it was fun!
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[User Picture]From: thelucyfurr
2006-05-08 03:35 am (UTC)
You are the funniest in the land.


Except I bet you totally faked this with photoshop. Just like the moon landings.


*also, three cheers for fuzzy science buddy*
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From: seanmeister
2006-05-08 03:37 am (UTC)

Best. Smackdown. EVAR!

three w00ts and a huzzah to you sir - you rock!
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[User Picture]From: ivorjawa
2006-05-08 03:50 am (UTC)
"Science Coffee"

BWAHAHAHA
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[User Picture]From: aerolyn1
2006-05-08 04:51 am (UTC)
HAHAHAHAHHAAAAAA!!! I love my geeky friends - it's good to know that I'm not alone... ;)
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From: ex_agentcoo
2006-05-08 07:41 am (UTC)
Oh my God. You're totally awesome.

Science!

I can't quite tell who your science buddy is; is that Beau?
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[User Picture]From: kalimdor_wilson
2006-05-08 07:46 am (UTC)
Of course!
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[User Picture]From: alt255
2006-05-08 09:08 am (UTC)

Ir with canon slr's is easy.

My roomate just got a tiffen IR filter
and by setting the exposure really long and using a tripod he has been getting great shots.

Note: for a really interesting effect take a picture of something green like grass without the IR filter then use the green photo for a custom white balance then shoot your IR, it's really really odd.

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[User Picture]From: kalimdor_wilson
2006-05-08 05:59 pm (UTC)

Re: Ir with canon slr's is easy.

Ooo! I will try this!
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From: (Anonymous)
2006-05-09 07:21 pm (UTC)

Re: Ir with canon slr's is easy.

Ok, i checked with my roomate he says you should take the photo of grass with the ir filter on THEN white balance to the grass, so i was a litttle bit wrong about the steps needed.
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[User Picture]From: alt255
2006-05-09 07:22 pm (UTC)

Re: Ir with canon slr's is easy.

oh that was me again
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From: (Anonymous)
2006-05-09 07:23 pm (UTC)

Re: Ir with canon slr's is easy.

Turns out his filter is a hoya R72, I need to get my facts straight next time.
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[User Picture]From: alt255
2006-05-09 07:34 pm (UTC)

Re: Ir with canon slr's is easy.

On another related note, IR images are brighter as raw(CR2) files than as JPG.
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[User Picture]From: kalimdor_wilson
2006-05-09 08:59 pm (UTC)

Re: Ir with canon slr's is easy.

I started shooting RAW a few weeks ago and will never be going back to JPEG. :)
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From: (Anonymous)
2006-05-08 03:05 pm (UTC)

Remote control

I am never one to complain about some soldering, but would a normal remote control not have done the same job?

I assume that it is so dark because the IR filter inside the camera is doing it job just not very well!
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[User Picture]From: kalimdor_wilson
2006-05-08 04:41 pm (UTC)

Re: Remote control

A normal remote is too dim to be imaged by my camera in a reasonable amount of time.
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[User Picture]From: pirat_ponton
2006-05-08 03:12 pm (UTC)
I usually don't comment much but I just want to tell you that I enjoy most (if not all) of your pics, that infrared one you refer to in this post was particularly striking, and this explanation-post is particulary entertaining!

thanks for sharing your art

keep on keepin' on
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From: (Anonymous)
2006-05-08 04:20 pm (UTC)

youre stupid

Cool that you were right. Not cool that you are such a loser that you made proving some dude on the internet that he was wrong in to a mission. i wouldnt have spent a dime on that guy. i hope to God that you had all that stuff lying around and that the entire thing took no more than 5 minutes. Any more time spent on him indicates you are a monster dork. you are a loser. you could have also told him to point his remote control for the t.v. in to a regular video camera. that would have only cost you time spent typing. you sure a dumb smart guy.
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[User Picture]From: kalimdor_wilson
2006-05-08 04:40 pm (UTC)

Re: youre stupid

Yeah, how dare I have fun on a Sunday with a friend playing with infrared light and electronics and photography and drinking coffee, all for a few bucks! How awful! Why, I'm such a stupid loser!

*blink*

I've been a monster dork since at least the 3rd grade. This isn't news. I prefer the term "geek", but you may call me a "dork" if that's the vernacular you prefer.
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[User Picture]From: tungsten
2006-05-08 06:02 pm (UTC)

Re: youre stupid

a) stupid is the wrong term.
b) dork means penis, like an anonymous poster
c) the correct derogatory term for a smart person is nerd
d) the correct term for someone who takes their smarts and overspecializes in something is geek
e) proving somebody wrong doesn't makes someone a loser. Buy a dictionary loser.
f) of course they were overcomplicated in proving their point, did you see the cofee maker?
g) I am and will remain unappolagetic about my listing
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From: (Anonymous)
2006-05-08 07:11 pm (UTC)

Re: youre stupid

Words would have done just fine to convince someone who is not as close minded as yourself or the person arguing with kalimdor originally. However, when dealing with the sort of ilk that needs his IR photography to be the only kind on the internet, I think perhaps a picture is worth quite a bit more than a thousand words. Even if it didn't quite work in this case.
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From: (Anonymous)
2006-05-08 07:19 pm (UTC)

Remote Control with my Canon

My Canon picks up IR from my TV remote control -- just hold a button down and the light at the tip is picked up as purplish. Also works for fires in a fireplace -- a lot more light (again purplish) is picked up than is visible to the eye.

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[User Picture]From: kalimdor_wilson
2006-05-08 08:07 pm (UTC)

Re: Remote Control with my Canon

I'll be darned! Cool!
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[User Picture]From: toadpipe
2006-05-08 10:24 pm (UTC)
Next time though, give me a ring and you guys can use one of my breadboards. It'll save you a little cash and needs no soldering.
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[User Picture]From: kalimdor_wilson
2006-05-09 12:55 am (UTC)
Ah, but soldering was half the fun!
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From: (Anonymous)
2006-10-29 12:55 pm (UTC)

?

i am not a geek, and i have no idea what you are on about but atleast its better than some other people who talk gobbledegook, but do you have any info on resistors thats easy to understand cos i need some info for woodwork, if you have any thanx if you dont have any :( ... so CYA
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