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LAN_403

HV Enthusiast

Sat Apr 01 2006, 03:12AM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

wrote ...

Do you have to have a special lens to do IR or what?

For IR work, you can basically use any old lense. However, digital cameras typically are not sensitive to near IR wavelengths due to the internal IR blocking filter. So, to do any serious IR work, you need to remove the internal IR blocking filter from the digital camera. Then, you need to use an external low pass filter which blocks all light, including visible, above the near IR wavelengths such as a Hoya RM72 or RM90 filters. I replaced my internal IR blocking filter on my Canon D60 DSLR with a custom cut Hoya RM72 filter. So my D60 is now a dedicated IR DSLR and can be used for nothing else.

Bjørn

Sat Apr 01 2006, 03:52AM

Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058

With my cameras I need to increase the shutter time by about 1500 times to get a usable IR picture. That generally means sunlight and a tripod.

Here is one taken without a lens with just a pinhole.

Steve Conner

Sat Apr 01 2006, 09:50AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Those IR pictures are great. I knew about IR film, but I didn't know it was possible to do it with a digital camera. You learn something new every day!

Will: Does someone have to eat the "Volcano" afterwards

Avalanche

Sat Apr 01 2006, 10:06AM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

A while ago I modified a couple of computer webcams by removing the internal IR filter, and putting a visible light filter in (a bit of blackened 35mm film taken from a negative). It works great, and is cheap too. Good for experiments and playing about, for example you can see clearly through red wine using IR. It surprises most people to see that.

HV Enthusiast

Sat Apr 01 2006, 01:45PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

BjÃ¸rn BÃ¦verfjord wrote ...

With my cameras I need to increase the shutter time by about 1500 times to get a usable IR picture. That generally means sunlight and a tripod.

Here is one taken without a lens with just a pinhole.

Bjorn,

I'm not convinved you are picking up an IR in your photo above. Appears mostly visible light reflections. If there was near IR light passing through, your foliage would appear white, and not green as in your photo.

Here is a photo i took this morning of some rhododenrons in front of my house with my IR D60. As you can see, the foliage is completely white and no hints of green.

Also, here is an interesting shot of my son in IR. Really makes for a ghastly appearance . . .

Also, some have asked why there is a lot of blue (i.e. sky) in my previous IR shots. This is accomplished by simply swapping the red and blue channels using photoshop. The information doesn't change at all, but the mapping of pixels from blue to red and red to blue (channels) restores the blue sky and gives another effect.

c4r0

Sat Apr 01 2006, 02:14PM

Registered Member #151 Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153

BjÃ¸rn BÃ¦verfjord wrote ...

Here is one taken without a lens with just a pinhole.

EVR,

It's not an IR photo. It is a photo taken with a lid with a pinhole instead of lens.

HV Enthusiast

Sat Apr 01 2006, 02:28PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

wrote ...

EVR,

It's not an IR photo. It is a photo taken with a lid with a pinhole instead of lens.

Oh, i thought he said he took an IR photo with a pinhole lense. My bad.

c4r0

Sat Apr 01 2006, 02:37PM

Registered Member #151 Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153

Here are my brother's IR photos.
1. LEGO RCX data transmitter
2. Bike hub in normal light (both hub and fork are black)
3. The same hub in IR.
4. Car, probably after refurbishment. These stains are invisible in normal light.

Here is my brother's website:

. He told that i have to place his website address in this post if i want to attach his photos

[edit] camera: sony dsc f-707 + homemade ir filter

Part Scavenger

Sun Apr 02 2006, 02:56AM

Registered Member #79 Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673

Those IR ones are cool! I have so got to do that.

BTW, EVR, that makes a really cute kid look pretty creepy...

Avalanche

Sun Apr 02 2006, 10:55AM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

Here are some infra-red pictures I've just taken

I just had to grab my trusty modified webcam to take these. I took apart the optics, and removed the IR filter by scratching it off with a needle(!) and added a visible light filter in place.

First is my Canon powershot G5 - which is usually black (like the hub c4r0 posted above)
Second is out my bedroom window

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