Infrared is a spectrum of light beyond that which we normally see. Infrared photography was only used in film cameras in the past, but despite having an IR blocking filter installed between the lens and the Digital Camera's Sensor, most digital cameras can still react to infrared energy, though at levels far lower than visible light. To take "Infrared " pictures, 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.
Infrared filters often used in crime detection, medical photography, detection of distribution of vegetation. For photographers, this filter can be used with infrared film or digital photography to get interesting artistic and creative photos.
950nm is suitable for outdoor and strong light use.
850nm is suitable for outdoor and strong light use.
760nm is suitable for indoor and weak light use.
720nm is suitable for indoor and weak light use.