Instructables
Picture of (near) infrared photography

you can be on your way to taking your own ir photographs with a digital camera, $10, and good ol' fashion sunlight!

 
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Step 1: The essentials:

the most important items:

-camera (digital better, but not necessary*) with MANUAL controls
-filter; specifically, you will want to start with an IR720 filter, sometimes referred to as ''R72'', ''R720''. i found a brand new one on amazon for $10.50 (included shipping) 
*film cameras can just use ir film

not necessary, but veerryy helpful:

-tripod
-white balance/grey card 

Step 2: The physics of it all (skip if you're in a hurry)

-in essence, a camera is a device for capturing light, a source of electromagnetic radiation.
-there are many different types of electromagnetic radiation, light, microwaves, radio waves, x-rays, etc.
-together, all these different types of radiation make up what’s called the electromagnetic spectrum.
-we measure and classify each type of ‘light’ by wavelength; visible light, the light that you and i can see, ranges from about 400nm to about 700nm in wavelength.

-with ir photography we are interested in wavelengths of light in the infrared; ‘infra’ or ‘below’, so really light ‘below-red’. Hence the R720 filter; we’re blocking out light who’s wavelength is shorter than 720nm.

-your camera is very well adapted to recording ir light. so well, the people that made it have already put a filter in it to block out ir light.
-what you’re attempting to do is only pass ir light into the camera, so it doesn’t have a choice but to record it

Step 3: Let's get going!

Picture of let's get going!
-throw on your fliter and head outside! (the sunnier the day, the better)
-start out with f.4 and shutter speed around 1/3''sec. exposure time will vary greatly with the amount of light.
-once you've found a proper exposure, your pictures will appear reddish/pink