Cool stuff! I like how the vegetation came out extremely light and the sky extremely dark; classic infrared. The slow exposure also adds to the blurry, surreal feel you can get from IR shots. As far as a quick and dirty critique goes, you could probably use a little less sky and a bit more detailed land to even things out in your composition.
I have always been interested in IR photography, but until now, it has beeen a bit too pricey and difficult to experiment with. Recently I have converted to digital. Do you do any major post-processing in Photoshop or anything after taking an IR picture? Can you buy any old IR filter and expect it to work with a digital SLR?
sorry it took so long to comment back, but yes any sort of IR filter will work, however some cameras are more suited to IR than others because they dont have an IR cut filter ( a filter in front of the sensor that limits how much infrared light can get in), my camera has one and is not very sensitive to IR but some cameras dont have them and they take amazing pictures!
looks like your question has already been answered.... you use a filter that blocks the visible spectrum and only the Infraredlight gets through to the sensor (we cant see it but the sensor can) so the sensor makes a picture using infrared light...