Quote:
Originally Posted by Czymra
I doubt a mere filter will produce all the results wished for, you wanna send out some IR light as well.
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Infrared is a spectrum of light beyond that which we normally see.
Despite having an IR blocking filter installed between the lens and the CCD, most digital cameras still react to some near 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 near infrared and infrared spectrum through to the film or sensor.
You don't need to send any IR light out. You only need an infrared filter. (or a expensive IR camera)
Hints:
- There is more infrared light around when there is bright sunlight. This doesn't mean you should avoid using IR in other conditions but that the effects are stronger when the sun is out.
- Largest amount of IR: the hours just after sunrise and before sunset (due to the angle of the sunlight through the atmosphere), the effect is most dramatic (i.e deep black sky) when photographing with the sun behind the camera.
-An electronic or bulb flash will increase the amount of IR as well as visible light.
Infrared do not records heat.
This is a common myth - that since heat output is a kind of infrared radiation, then infrared film or CCD must detect heat, such as human body heat. This is essentially incorrect. Thermal radiation will not be recorded by infrared film or sensors; they are not sensitive to a long enough wavelength to show such things as heat patterns.
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