In Infrared Photography (IR Photography) a large part of the visible light is blocked out and the invisible infrared light spectrum is recorded.
In the old analog film period a special infrared film was used that was extremely light sensitive and had to be handeled very carefull.
In the new digital photography era no light sensitive film is to be used. The way to get to IR images is to block out the visible light spectrum by very dark red filters. This can be done by either screw-on type IR filters in front of the lens or internal replacement IR filters that go directly before the sensor internally within the camera.
The IR filters come in a variety of strength, meaning the amount of visible light they block and the amount of infrared light they let through creating differnet effects with each IR strenght filter.
As I got inspired to IR photography on a local photography show in August 2012 I bought an older Nikon D1x DSLR camera with front of the lens IR filters. Additionally I bought a Nikon D70 DSLR camera (using a 10.5mm lens with it) and an older point and shoot Cancon 3010 Powershot, both permanently converted to IR with an internal IR filter placed in front of the digital image sensor.
As I am just getting started you will see a learning and playing curve. I totally enjoyed IR Photography right from the start. The images can be very dramatic in a way you can not get them in black and white. A great and dramatic combination is HDR IR photography as the image on top of this page.
For post capture development I use Adobe Lightroom 5, Adobe Elements 9, for HDR conversions I use Photomatix 4.2.4 and for black & white conversions Nik Silver Effex Pro 2.