This Infrared filter can help you do Infrared photography by ordinary DSLR cameras. Similar as Hoya R85 filter, this IR filter can block all visible light under 850 nm, therefore lets you experience some different photography.
Infrared Light Photography for Digital Camera
Infrared is a spectrum of light beyond that which we normally see. Infrared photography was always a film cameras area, but despite having an IR blocking filter installed between the lens and the CCD, most digital cameras still react to infrared energy, though at levels far lower than visible light. To take "infrared" pictures - i.e., photos primarily made up of near infrared energy - you need to filter out the visible light and only allow the infrared spectrum through to the lens. The easiest way to do this is to use an infrared filter.
