IR Photography

[asterroc]

I tried out some IR photography this weekend (after a post on UV photography by txtriffidranch the other day). In the sequences below the cut, I have three images: normal visible light (technically, representative false color), a black and white version of the visible light image, and an IR black and white version. (I used an IR filter which blocked out all but the reddest of visible light and of course didn't block IR. Digicams are sensitive to a bit of the IR spectrum, so it sensed both the red and the IR and that became the image). If you want more explanation of the phenomena, I posted on my science blog about it.


From top of Mt. Holyoke, Skinner State Park, looking southwest.




Communications shack atop Mt. Skinner

Comments

[framefolly.livejournal.com]

Wow! Really startling changes -- and continuities! The second set, with the trees and sky, is particularly striking. Beautiful pictures!

[zandperl.livejournal.com]

One thing that really surprised me was the difficulty focusing the IR images. Firstly, the autofocus didn't work quite right - since IR light bends a different amount when passing through glass than visible light, the process the camera uses for visible light apparently doesn't work as well for IR light. The second problem was that when you block out all the visible light, the image gets much dimmer, so where the normal light images were taken at 1/200 of a second, the IR light ones were more like 1/2.5 sec, and at those lengths you start getting blurring from shaking the camera.