An infrared shot with faux color pulled from the raw file. Camera is a converted infrared camera, 590nm light red on the sensor, and a B+W 092 Deep red added to the lens to narrow the infrared range down to 695nm (visible light ends at 700nm, and continues as infrared from there).
Blue sky created by swapping the red/blue channel and tweaking the hue.
It is a composite (multiple images put together), so it is capable of printing to 32 x 32 inches.
You almost never get a blue sky on an infrared converted camera, so channel swapping is usually required (or some really funky hue changes), the problem is, I want to try to get it as close to 'natural' as possible while still being surreal in appearance. But least it gives you an idea of what it comes out of the camera as. (The Jpeg copy is closer to a blue as the in-camera jpeg can save closer to the actual white balance when set custom against either grass or a grey card, but you lose obvious finer details).
You basically want something that shows sensitive at 400nm and below (UV), and 700nm and above (Infrared), 400 to 700 is the visible range. The listings on uviroptics' ebay page shows a transmittance chart for most of the listings.
This blog entry was pretty nice in illustrating some of those less common filters that you can stack to get the most options from fewer filters (like putting a common UV(0) protective filter on a dual-pass one to get just IR when you want it) www.photoir.net/minimum-filter…