Infrared (IR) photography is fun and interesting, however, getting a proper IR filter that allows only IR light to pass through for your camera can be costly and difficult to find. If you have a point and shoot, or in my case, a smartphone, you can avoid the cost and difficulty of buying one.
Find this how-to project and many others on Squareguides.
Step 1: Materials & Tools
For this project, you'll need a camera (I'm using my smartphone), a floppy disk, an X-Acto knife, and a ruler. That's it.
Step 2: Check Your Camera
The first and most important step is to check that your camera does not have an IR blocking filter built into it. If it does, this project will not work. However, the camera may work if the IR blocking filter isn't very sensitive and only blocks some IR light.
So how do you know if your camera has an IR blocking filter? Turn the camera on, get a remote control of some kind (TV, DVR, etc...), point the front end of the remote with the IR LEDs in it towards the camera lens and press any button. You should see them light up if your camera is sensitive to IR light (they'll look purplish). Congrats!
If you don't see anything, make sure the remote isn't dead. If you still don't see anything, then you have a good camera and unfortunately the only way to continue is to take it apart, which is outside the scope of this project.
Step 3: Cut Your Floppy Disk
Take your floppy disk and, using your X-Acto knife and your ruler to guide you, cut open the floppy disk. Try to not cut into the actual disk inside.
Step 4: Add the Filter to Your Camera
Crack open the floppy disk. This will release the adhesive holding the two halves together allowing you to obtain the actual disk from inside. This is what we are after.