View Full Version : Digital IR

10-17-2007, 07:08 AM
Here's something I've been wanting to try. All three pics are with a 5mp low end digital camera and shot through a hand held infrared filter I got on eBay. The camera was actually set to 3mp resolution. The filter is an unmarked series VI, I think it was advertised as an 89B, but I don't remember. It's completely opaque to visible light, but it sure lights up the display on the camera.

These three shots are about a 10 minute walk from my office, it makes for a nice walk at lunch time. Exposure times were 1.9 sec. according to EXIF data. The day was mostly cloudy so i wasn't expecting much in the way of available IR, but you can see there is plenty. The images all have a peculiar pixelation pattern in them but it's not objectionable. This first one is mostly hi key, though the leaves really haven't started turning yet. The two figures on the trail are my supervisors. Attached files http://f295.f295.org/uploads/hpim0268edit_6571.jpg (http://f295.f295.org/uploads/hpim0268edit_6571.jpg)

10-17-2007, 07:10 AM
This shot is mostly low tones, but there is pretty good detail in the shadows. The histograms on all three were not clipped.

Attached files http://f295.f295.org/uploads/hpim0269edit_6638.jpg (http://f295.f295.org/uploads/hpim0269edit_6638.jpg)

10-17-2007, 07:16 AM
This one has a good mix of high and low tones. I'm amazed at the shadow detail here. All three pics probably have a little camera movement as I was working off a mini tripod and hand holding the filter, it made for an akward effort. I like the effects though and may pursue this technique.

Actually I WILL be trying more of this, I just ordered a 2 gig memory card yesterday. ;D Attached files http://f295.f295.org/uploads/hpim0275edit_9891.jpg (http://f295.f295.org/uploads/hpim0275edit_9891.jpg)

10-19-2007, 04:36 AM

Do you let it auto-expose?

10-19-2007, 07:36 AM
These are all good.

Do you shoot RGB then force to greyscale?
I find that sometimes the red layer by itself is the best.

I'm not to happy with the results of my digiwhatzit with IR.
Too noisey.

10-19-2007, 09:20 AM
Do you let it auto-expose?
Yes. The camera is a cheapie, so that's my only choice. The maximum shutter time is 2 sec. and for the conditions it seems to be quite adequate.

Do you shoot RGB then force to greyscale?
I find that sometimes the red layer by itself is the best.
RGB is the only choice on the camera so the shots were "color" (deep magenta), and then desaturated in LightRoom. Curves adjustments were made from there. Looking at these pics on my work computer I see they don't have the punch they do at home.

I hadn't thought about using just the red channel. That will have to wait until I have a full version of PS. No alpha channel adjustments available in PSE 4 for the Mac.

10-20-2007, 12:23 PM
Way cool!
These are beautiful images-- wouldn't it be fun to try printing and hand-coloring some of these?!
I've done the same thing with a Hoya R72 filter on a Minolta Dimage that I bought just for this purpose after reading about it in a book by Theresa Airey. (hope I spelled her name correctly). It does have a B/W mode, which I use for this. Haven't played with it in a while but my understanding is that cheaper, older cameras are best for this because they haven't got the IR filtering built-in (as most higher-end, new cameras do). My exposures also require high ISO and longer exposures (1 or more sec. as I recall). Noise isn't too bad, even at ISO 800. See my flickr site-- I think there are some examples there.

Have you heard about the test to see if your camera will work for this technique? In a dark room, point your TV remote at your camera lens. If you see a bright dot on the camera viewscreen, that probably means you can make IR images with a filter and this camera.

This makes me want to get it out and play. All the leaves will soon be gone from the trees around here, though :-/

10-22-2007, 10:46 PM
These all have surprisingly good contrast. Well done.

10-25-2007, 04:15 PM
Thanks for the comments guys.

Mary, I think some of the alt printing methods would make this kind of image really pop (like your bromoil). Even though I can't do any printing right now I've been making myself go out and shoot so I'll plenty of alt process fodder for the future. I think Theresa Airey's books are where I first read about the TV remote test for a digital camera.

Earl, I actually flattened the mid range contrast a little bit to keep some separation there. I have another group still on the card from a shoot in full sun. This camera seems to be very sensitive to IR. Anything growing thing with direct light on it tends to blow out, but I still get reasonable shadow tones.

One of my tests shortly will be a night outing around Columbia. It will be interesting to see what we get from the ground and buildings, if anything.

10-27-2007, 01:16 PM
........................Anything growing thing with direct light on it tends to blow out, but I still get reasonable shadow tones..........................

That's just another funny thing about IR. Kodak and others a long time ago said that it was from florescent chlorophyll and more recent developments says it is reflectance off cell walls.
I could be totally wrong, but I think that both phenomena are happening.

This is more florescent:
Attached files http://f295.f295.org/uploads/97barnir2_2662.jpg (http://f295.f295.org/uploads/97barnir2_2662.jpg)

10-27-2007, 01:17 PM
And this is more reflectance:

Attached files http://f295.f295.org/uploads/97barnir_162.jpg (http://f295.f295.org/uploads/97barnir_162.jpg)