To take infrared photographs with a digital camera, we need to filter out the wavelengths of visible light. Fortunately there are special filters available that do just that, and they are readily available from good photographic shops and online retailers. For this tutorial I'm using a high quality Hoya R72 glass IR filter. This was quite expensive (£27), but it is possible to buy cheaper ones. At first glance this filter appears to be completely opaque, but if you hold it up to a bright light you can just about see through it, tinted a very dark red.
Almost any digital camera will do for infrared photography, as long as it can see a remote control IR emitter. Some cameras are better for it than others, but most will produce pretty good results. I'm using a Nikon CoolPix P60 compact camera which I'm currently testing for a review, but you can use whatever you have available.
It's a good idea to use a tripod for infrared photography. Because the IR filter is very dark it reduces the exposure a great deal, resulting in very slow shutter speeds, which means you risk camera shake if you try and use it hand-held.
The Nikon P60 doesn't have a filter thread, so I'll have to manually hold the filter in front of the lens, being careful not to get my fingers in the frame.